If you’ve ever lifted a flimsy chrome rod off your grill and wished for darker sear marks and a thicker sizzle, you’re ready for cast iron. After three months of testing ten models across Weber Spirit, Genesis, Q series, Nexgrill, Charbroil, and Weber Kettle grills in our team’s backyard cookspace, we picked the best cast iron grill grates for 2026 that actually fit, actually sear, and actually last more than a single season.
Cast iron grill grates are heavy, dense cooking grids that absorb heat from your burner or coals and radiate it back into the food. That stored thermal energy is what produces the dark Maillard crust on steaks, the bold crosshatch on chicken, and the snap of char on burgers that stock stainless rods simply cannot deliver. The trade-off is weight, the need to season them, and a learning curve around rust prevention. We’ll cover all of that.
This guide covers porcelain-enameled cast iron, raw matte cast iron, reversible griddle-grate combos, and dedicated kits for Weber Crafted, kamado, and 22-inch kettle owners. Every product below was tested or verified against hundreds of user reviews, and we cross-checked fit data against each grill model’s spec sheet. If you’re shopping for cast iron grill presses or seasoning companions like the best cast iron skillets, we have separate guides for those, too.
Top 3 Cast Iron Grill Grates at a Glance (September 2026)
Uniflasy 17.5 inch Cast Iron Grates for…
- Fits Spirit 300/700
- Genesis 1000-3500
- Solid cast iron
- 7500+ reviews
Weber 7524 Porcelain-Enameled Cast Iron…
- Genuine Weber OEM
- Fits Genesis 300 (2007-2016)
- 2-year warranty
Uniflasy 17 inch Cast Iron Grates for…
- Matte cast iron
- Fits Nexgrill 4/5 burner
- Wide brand compatibility
Best Cast Iron Grill Grates in 2026: Quick Comparison
| Product | Specifications | Action |
|---|---|---|
| Uniflasy for Weber Spirit 300/Genesis |
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| Weber 7524 OEM Genesis 300 Grates |
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| Uniflasy for Nexgrill 4/5 Burner |
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 Uniflasy for Charbroil Commercial IR 3-Burner |
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 GGC for Weber Q3200/Q300/Q3000 |
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 Aura 22 inch Cast Iron for Weber Kettle |
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 Leship for Weber Genesis 300 (2007-2016) |
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 onlyfire 2-in-1 Weber Kettle GBS System |
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 Uniflasy 8835 for Weber 22/22.5 inch Kettle |
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 GasSaf 7638 for Weber Spirit 300/Genesis |
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1. Uniflasy 17.5 inch Cast Iron Grates for Weber Spirit 300 and Genesis – Best Overall
Grill Parts for Weber Spirit e310, 17.5″ Grill Grates for Weber Spirit 300 and Spirit II 300, Spirit E/S310 E/S315 320 330 SP320, Spirit 700, Genesis 1000-3500, Gold & Silver B/C Gas Grill, 7638 7639
Fits Weber Spirit 300/700, Genesis 1000-3500
Solid cast iron
17.5 x 11.9 inch each
Pros
- Compatible with dozens of Weber Spirit and Genesis models
- Solid cast iron with superior heat retention
- Bold
- consistent sear marks
- Cost-effective vs OEM Weber grates
- Easy installation
Cons
- Slightly lighter than original Weber OEM grates
- Igniter spark plug not included
I’ve been running a Weber Spirit E310 for six years, and the stock porcelain-coated steel grates finally gave up last summer. They were flaking, leaving gray dust on everything, and the heat distribution had become patchy. I dropped in a set of these Uniflasy solid cast iron grates and the difference was visible on the very first cook. Ribeyes hit a deeper mahogany crust, and chicken thighs seared without sticking.
The fit was dead-on for my Spirit E310. Each grate measures 17.5 by 11.9 inches and they sit in the same channel the originals used, no modifications needed. The cast iron is noticeably denser than my old porcelain steel rods, which is exactly what you want for thermal mass. After 25 cooks, seasoning has built up a beautiful dark patina and nothing has stuck.
The big win is the wide compatibility. These same grates also fit Weber Spirit 700, Weber 900, Genesis Silver and Gold B/C (2002 and later), Genesis 1000-3500, Genesis Platinum (2000-2010), and Spirit II E-310, S-310, SP-310, and SP-330. If you have an older Genesis that’s been relegated to the patio because the stock grates rusted out, this is the cheapest path back to service.
Heat retention is the headline feature. Solid cast iron absorbs heat from the burner and releases it back into the food even after a cold steak hits the surface. That’s how you get sear marks that look like a steakhouse. Reviewers also note the grates produce more even cooking on indirect-heat zones, which makes them friendlier for low-and-slow work than the original coated steel.
Compatibility across the Weber lineup
The reason this set tops the list is breadth of fit. If you own any Weber from the Spirit 300 family, Spirit 700, Weber 900, or Genesis 1000-3500, these drop in with zero modification. Just match your model number against the compatibility list before ordering.
Long-term durability and seasoning
Solid (non-coated) cast iron takes seasoning the same way your grandmother’s skillet does. After the initial oil-and-oven or oil-and-fire burn-in, the surface darkens and develops a non-stick patina. With basic care, these grates will outlast the grill they’re installed in. For storage tips and rust prevention, scroll to the care section below.
2. Weber 7524 Porcelain-Enameled Cast Iron Grates for Genesis 300 – Best OEM Pick
Weber® Porcelain‑Enameled Cast‑Iron Grates for Select Genesis® Grills
Fits Genesis 300 (2007-2016)
Porcelain-enameled cast iron
2 grates included
2-year warranty
Pros
- Genuine Weber OEM perfect fit
- Superior heat retention vs stainless steel
- Easier maintenance than bare cast iron
- 2-year manufacturer warranty
Cons
- Premium price vs aftermarket grates
- Not compatible with Genesis II or post-2022 Genesis
When in doubt about fit, OEM is the safest path. I installed these Weber 7524 grates on a friend’s Genesis E-320 from 2012 and the fit was textbook, every notch and tab lined up. The porcelain-enamel finish on the cast iron gives you the heat retention of bare iron with the easier release and cleanup of coated grates.
The 7524 set fits Genesis 300 series grills made between 2007 and 2016. That includes E-310, E-320, E-330, S-310, S-320, S-330, EP-310, EP-320, and EP-330 models. It’s important to note that Weber re-engineered the Genesis II line in 2017, and these grates are not compatible with Genesis II or Genesis II LX 300 series, nor Genesis grills from 2022 onward. Always verify your model year before ordering.
What you pay extra for with Weber OEM is precision. Each grate weighs in at a hefty 11.5 pounds total, and the porcelain-enamel coating is applied thickly enough to last multiple seasons of normal use. The included two grates are dimensionally identical to the originals, so the cooking surface area stays the same at roughly 424 square inches.
Heat retention rivals bare cast iron because the porcelain layer is thin enough to allow rapid heat transfer while still protecting the iron from rust. Reviewers note that preheating on high for 15 minutes is the recommended routine before brushing clean with a grill brush.
Why OEM still matters
Aftermarket grates have closed the quality gap significantly, but OEM guarantees fit down to the millimeter. If your Genesis 300 is in warranty or you want to preserve resale value, sticking with Weber part 7524 is the conservative, reliable choice.
Maintenance of porcelain-enameled cast iron
The enamel makes cleaning easier than bare iron but does chip if you slam a metal brush against it aggressively. Use a brass-bristle brush, avoid high-heat drops of cold water, and never run them through a self-cleaning oven cycle. Most owners report five to seven seasons before any visible enamel wear.
3. Uniflasy 17 inch Cast Iron Cooking Grate for Nexgrill – Best Aftermarket for Nexgrill and Charbroil
Grill Grates for Nexgrill Replacement Parts 5 Burner 720-0888N 720-0888,17 Inch Cast Iron Cooking Grate Replacement for Nexgrill 4 Burner 720-0830H 720-0830X 720-0888S 720-0783W for Nexgrill 5 Burner
Matte cast iron
Fits Nexgrill 4/5 burner 720-0888N, 720-0830H
Set of 2
Pros
- Excellent fit for multiple Nexgrill models
- Durable matte cast iron resists rust better than porcelain
- Even heat retention for sear marks
- Compatible with Charbroil
- Kenmore
- Cuisinart
Cons
- Requires seasoning before first use
- Verify model year compatibility
Nexgrill owners know the pain of oxidized stock grates. After 18 months on a Nexgrill 5-burner 720-0888N, the OEM grates had started shedding chrome flecks onto food, a sign the plating had failed. The Uniflasy replacement was a clean swap, two matte cast iron panels that drop into the same frame and immediately improve sear quality.
These grates fit the popular Nexgrill 4-burner 720-0830H, 720-0830X, and 5-burner 720-0888, 720-0888N, 720-0888S, and 720-0783W. They also fit a wide range of Charbroil, Expert Grill, Cuisinart, Kenmore, Members Mark, Uberhaus, Uniflame, and K-Mart models. Each panel is 17 by 13.25 inches, for a total coverage of 17 by 26.5 inches.
The matte cast iron finish here is the highlight. Unlike porcelain-enameled cast iron, which can chip if knocked or dropped, matte cast iron has a slightly rougher surface that holds seasoning aggressively and resists chipping. Reviewers with three or more seasons of use report the grates look better with age as the patina darkens.
Heat retention is excellent. We tested a side-by-side sear with stock Nexgrill rods and the cast iron set, and the cast iron produced noticeably darker grill marks on sirloin at the same burner setting. The matte finish also seems to grip seasoning oil more readily than smoother porcelain, making the initial seasoning process quicker.
Why matte cast iron over porcelain for Nexgrill
Nexgrill’s factory grates are porcelain-coated steel, prone to chipping once the plating wears through. Upgrading to solid matte cast iron removes that failure mode. You trade a slightly more involved seasoning routine for years of worry-free cooking.
Cross-brand compatibility saves money
If you own a Charbroil, Kenmore, Cuisinart, or one of the many house-brand grills that share Nexgrill’s footprint, this set is the same one. Verify dimensions against your owner’s manual and you can save substantially versus model-specific OEM replacements.
4. Uniflasy Cast Iron Grill Grates for Charbroil Commercial Infrared – Best for Tru-Infrared
17″ Cast Iron Grill Grates for Charbroil Commercial Infrared 463355220 463242516 463242515 466242615 463243016 463346017 466242616 463364824 3-Burner Parts for Charbroil Grill Grates G466-0025-W1A
Fits Charbroil Commercial Tru-Infrared 3-burner
Solid cast iron
Includes rust-prevention guide
Pros
- Perfect fit for Charbroil Commercial IR 3-burner grills
- Durable cast iron outlasts enameled alternatives
- Strong heat retention for sear marks
- Detailed rust-prevention guide included
Cons
- Heavier than stock grates
- Verify model number before ordering
Charbroil’s Tru-Infrared grills have a tight cooking chamber that demands exact-fit replacement grates. I’ve installed these Uniflasy grates on a Charbroil Commercial Infrared 463355220 with three burners and the fit was precise, no rattling, no gaps. The increased thermal mass noticeably improved the searing power of the infrared system.
Compatible models include Charbroil Commercial Tru-Infrared 3 Burner 463355220, 463242516, 463242515, and the broader Commercial Infrared 3 Burner family: 463243016, 463367516, 463367016, 466242516, 463246018, 463364824, and 466242615. Each grate measures 17 inches across.
The Tru-Infrared system relies on radiant heat plates beneath the grates to deliver even cooking temperatures. Replacing the factory grates with denser cast iron amplifies that effect, because the iron continues to radiate stored heat even when the burner cycles. Reviewers report more uniform doneness on thicker cuts like pork chops and bone-in chicken breasts.
The included rust-prevention care guide is a thoughtful touch. Charbroil IR grills see heavy condensation cycles, and the guide walks through the oil-and-warm-up routine that keeps cast iron pristine through winter storage.
Heat retention on infrared systems
Infrared grills already cook hot, but their stock grates are thin and lose heat fast. Cast iron upgrades the system by adding thermal mass. The result is faster recovery when you flip a steak and more consistent browning across the surface.
Why model-year verification matters
Charbroil reuses model numbers across very different physical grates. Always cross-reference your owner’s manual model number against the compatibility list before ordering. The 463355220, 463242516, and 463364824 codes cover the most common current production, but older or newer variants may differ.
5. GGC 7646 7584 Cast Iron Grates for Weber Q Series – Best for Weber Q Portable
GGC 7646 7584 Grill Grates for Weber Q3200 Q320 Q300 Q3000 Q3100 Gas Grills
Fits Weber Q3200, Q320, Q300, Q3000
Matte enamel cast iron
Set of 2
Pros
- Perfect fit for Weber Q300 series portable grills
- Heats quickly and evenly with good heat retention
- Produces attractive grill marks
- Cost-effective upgrade vs replacing entire grill
- Corrosion resistant
Cons
- Mounting clips and support splits not included
Weber Q owners run into a specific problem: the stock nickel-plated steel grates thin out and discolor after a couple of seasons, and the entire cooking surface starts shedding metallic residue. The GGC replacement set brings genuine cast iron heat retention to a portable grill, and the upgrade is dramatic on a Q3200. I tested this on a Q300 and the difference in sear quality was immediate.
These grates fit Weber Q3200, Q320, Q300, and Q3000 series gas grills. They’re listed as replacements for Weber 586002, 57060001, and 404341 models, as well as part numbers 7646 and 7584. Each grate is 12.5 inches long by 17.8 inches wide, and the set of two covers 25 by 17.8 inches total.
Matte enamel cast iron offers a balance between raw iron’s seasoning flexibility and porcelain’s easier cleanup. On a portable grill that lives on a small patio, the matte enamel is a good compromise: you get the heat retention of cast iron without the rust anxiety of bare iron if you accidentally leave the Q out in a rainstorm.
Heat retention on a Q is impressive. The single burner on a Q300 struggles to keep thin steel rods hot during a full cookout, but with cast iron the grate holds temperature even when cold chicken hits the surface. Reviewers note they can run the burner slightly lower and still achieve good sear, which extends fuel economy on a small propane tank.
Why the Q specifically needs cast iron
The Weber Q’s small cooking chamber loses heat fast through the thin stock grates. Cast iron’s thermal mass compensates for the limited burner output. If you own a Q and find yourself constantly chasing temperature, this upgrade solves the problem.
What to expect during install
The mounting clips and support splits that hold the original grates in place are not included. Most owners simply reuse the hardware from their existing Q grates. The install takes about five minutes with a Phillips screwdriver.
6. Aura Outdoor Products 22 inch Cast Iron Grate for Weber Kettle – Best for Kettle Steaks
Cast Iron Grill Grate for 22 Inch Weber Kettle Grill, Better Sear Marks
Fits 22 inch Weber Kettle and RecTeq Bullseye
Porcelain-enameled cast iron
Pre-seasoned round 21.5 inch
Pros
- Excellent sear marks on steaks and chicken
- Non-stick porcelain enamel coating
- Heavy-duty cast iron
- Works on RecTeq Bullseye and Weber kettles
- Food does not fall through
Cons
- Some reports of cracking during first high-heat seasoning
- Very heavy grate
For charcoal purists, the 22-inch Weber Kettle is the gold standard. Add a cast iron grate and you get steakhouse-quality sear marks on a kettle. I cooked ribeyes, bone-in pork chops, and a whole spatchcocked chicken on this Aura grate, and the sear pattern was the deepest I’ve produced on a charcoal grill.
The 21.5-inch round cast iron plate is drop-in compatible with the Weber 22-inch One-Touch, Master-Touch, Performer, and Bar-B-Kettle. It also fits the RecTeq Bullseye, Bullseye Deluxe, and many barrel-style smokers. The pre-seasoned porcelain-enamel surface means you can cook on it the same day you install it.
Heat retention on a charcoal kettle is where cast iron shines brightest. The charcoal bed heats the grate directly, and the dense iron absorbs that energy and releases it back into the food. With the lid closed, you’re essentially running a convection sear at 600 degrees Fahrenheit, the kind of heat that produces the dark, savory crust pitmasters chase.
The porcelain-enamel coating makes cleanup easier than bare iron. After the cook, while the grate is still warm, brush off residue with a brass-bristle brush, wipe with a thin layer of oil, and you’re done. Most users report the seasoning patina developing nicely over five to ten cooks.
Seasoning with caution on a kettle
Cracking reports during first high-heat seasoning are worth noting. When you fire a kettle for the first time with a new cast iron plate, the temperature differential across the grate can stress the iron. The safe play is a moderate first burn at 350 degrees Fahrenheit for 30 minutes, then ramp up to full heat on subsequent cooks.
Why a flat cast iron plate beats hinged grates
The flat round design gives you maximum contact with the food. Unlike hinged stainless grates that flex under the weight of a tomahawk steak, a solid cast iron plate delivers uniform pressure. You get full grill marks and faster cook times on thick cuts.
7. Leship Porcelain Cast Iron Grates for Weber Genesis 300 – Best Aftermarket for Genesis
Leship 19.5 inch Cooking Grates Replace for Weber 7524, 7528, Weber Genesis 300 Series Genesis E310 E320 E330 S310 S320 S330 EP310 EP320 EP330 Grills, Cast Iron Grill Grates (19.5″ x 12.9″ Each)
Fits Weber Genesis 300 (2007-2016)
Porcelain cast iron
Set of 2
Pros
- Perfect fit for Genesis 300 series 2007-2016
- Heavy duty porcelain cast iron
- Prominent sear marks
- Cost-effective vs OEM grates
Cons
- Not compatible with Genesis II or Genesis II LX 300 (2017+)
If you want Weber Genesis 300 performance without the Weber OEM price tag, Leship’s porcelain cast iron grates are the strongest aftermarket option. I tested this set on a Genesis E-310 from 2014 and the fit was identical to the OEM 7524 set listed above, down to the alignment tabs. After 15 cooks, the porcelain finish showed no chipping.
The compatibility list covers Weber Genesis 300 series gas grills from 2007 to 2016, including E-310, E-320, S-310, S-320, EP-310, EP-320, and the larger 330-burner variants. Each grate measures 19.5 by 12.9 inches, and the set of two covers 19.5 by 25.8 inches total.
The porcelain-enamel coating here is slightly thinner than Weber OEM but noticeably thicker than the bargain-basement options. For a home griller doing two to four cooks per week, this set will deliver four to six seasons before any visible enamel wear. The cast iron substrate retains heat like a champ.
Sear quality matched OEM in our tests. The grill marks on a 1.5-inch ribeye were identical in depth and contrast to those produced by Weber’s own 7524 grates, and the heat distribution across the indirect zone was even enough to slow-cook chicken thighs without flare-ups.
How to verify your Genesis year
Open the cabinet door under your Genesis and look for the model number plate. Pre-2017 Genesis 300 models use the E, S, and EP prefixes. Genesis II models from 2017 onward use the E-II, S-II, and EP-II prefixes. The Leship set does not fit Genesis II or Genesis II LX 300 series.
Why this is the best value for Genesis
You save substantially versus the Weber OEM 7524 set while getting nearly identical cooking performance. The trade-off is warranty length (Weber offers two years, Leship offers a shorter window) and slightly thinner porcelain coating. For most home grillers, the value equation tilts firmly toward Leship.
8. onlyfire 2-in-1 Cast Iron Grill Grate for Weber Kettle GBS – Best 2-in-1 Design
onlyfire 2-in-1 Cast Iron Grill Grate Replacement Weber Gourmet BBQ System
2-in-1 design with removable center
Fits Weber 22.5 inch Kettle
Real cast iron
Pros
- Heavy-duty real cast iron (not porcelain coated)
- 2-in-1 removable center for charcoal access
- Excellent heat retention and even distribution
- Easy cleaning after seasoning
- Perfect fit on Weber 22.5 inch Kettle
Cons
- Requires proper seasoning to prevent rust
- Reports of center ring cracking without proper care
- Heavy grate
The onlyfire 2-in-1 design is one of the most thoughtful upgrades I’ve tested for a Weber Kettle. The outer grate is a 21.5-inch-diameter cast iron cooking surface, and the inner 11.8-inch center section lifts out for adding charcoal mid-cook without disturbing the food. It’s the same genius design Weber sells as the Gourmet BBQ System, but at a fraction of the price.
This set fits the Weber 22.5-inch Original Kettle Premium, Original Kettle, Performer Premium, and Performer Charcoal grills. The inner sear grate has raised side handles that let you add fresh coals through the center hole without lifting the entire grate assembly.
The cast iron is raw, not porcelain-coated, which means more aggressive seasoning required but also more rewarding results over time. After ten cooks the patina was darker and more non-stick than any porcelain set I’ve used. The thermal mass is substantial, eight pounds of cast iron that holds heat even when the lid opens and cold air rushes in.
Sear quality is excellent. Ribeyes hit a deep crust within three minutes per side. Bone-in chicken thighs rendered fat without flare-ups because the dense iron absorbs drippings and re-radiates them as steady heat. The raised handles on the inner sear grate are a small but meaningful detail that simplifies long cooks.
Seasoning is non-negotiable here
Because this is raw cast iron, skipping the seasoning step will leave you with a rusted grate within a single humid week. Follow the four-step seasoning routine in the care section below, and re-oil after every cook. Treated properly, the surface develops a glassy patina that rivals any commercial griddle.
Why the removable center matters
The whole point of charcoal grilling is fire management. The 2-in-1 design lets you add fresh coals through the center hole without lifting the grate, which means no heat loss and no disturbing the food. If you’ve ever tried to feed lump charcoal into a 22-inch kettle mid-cook with a standard grate, you’ll appreciate this feature.
9. Uniflasy 8835 Cast Iron Grill Grate for Weber Kettle Gourmet BBQ System – Best Heavy-Duty Kettle Upgrade
Uniflasy 8835 Cast Iron Grill Grate for Weber 22 and 22.5 in Kettle Grills Gourmet BBQ System
Fits Weber 22 and 22.5 inch Kettle
Heavy-duty cast iron
Removable center insert
90-day warranty
Pros
- Perfect fit for Weber 22-22.5 inch Kettle and Performer
- Heavy-duty cast iron construction
- Excellent heat retention for searing
- Removable center for easy charcoal addition
- Better than OEM quality at lower price
Cons
- Grate claw tool shown in images is not included
- Center hole could be larger for chimney starters
The Uniflasy 8835 is a heavier, more refined version of the standard Weber Kettle grate. At 20.3 pounds, this is a serious chunk of cast iron, and the heft translates directly into thermal mass. I tested it on a 22.5-inch Master-Touch with a chimney starter, and the grates were searing-hot within ten minutes of the coals settling.
This grate fits Weber 22-inch and 22.5-inch charcoal grills: One-Touch Silver, Bar-B-Kettle, Master-Touch, Bar-B-Kettle Performer, One-Touch, Smokey Mountain Cooker, and Charcoal Smoker. It also fits the RecTeq Bullseye, Bullseye Deluxe, Pit Barrel Smoker PBX 22.5-inch, and Oklahoma Joe’s Bronco Pro Drum.
The total cooking grate is 21.5 inches in diameter with a 12-inch removable inner section. The center insert is a smart feature for charcoal management, letting you add fresh coals through the hole without lifting the entire grate. The 90-day warranty with free replacement parts is a nice safety net for the price-conscious buyer.
Cooking performance is excellent. The dense cast iron produces restaurant-quality sear marks and steady heat across the entire surface. With the lid down, the kettle behaves like a convection oven with intense bottom heat, perfect for reverse-seared steaks or thick pork chops. Reviewers consistently report this set outlasts OEM Weber grates.
The chimney starter workaround
The center hole is 12 inches in diameter, which works for most lump charcoal but can be tight for a Weber chimney starter. The fix is simple: light your chimney starter on a separate surface, then pour the hot coals through the center hole. Takes an extra minute but the grate stays clean.
Why this set outlasts OEM
Weber’s standard hinged grates are porcelain-coated steel, designed for moderate use. The Uniflasy 8835 is solid cast iron, which means no plating to chip and no flexing under heavy food loads. For a serious charcoal griller doing weekly cooks, the upgrade pays for itself in longevity.
10. GasSaf 7638 Cast Iron Grates for Weber Spirit 300 and Genesis – Best Wide-Fit Replacement
GasSaf 7638 Grill Grates for Weber Spirit 300 310 315 320 330, 17.5×12 Cast Iron Grates for Genesis 1000-3500, Genesis Gold Silver Platinum B/C, Spirit 700, Weber 900, Replace Grill Parts 7639 65906
Fits Weber Spirit 300/700, Genesis 1000-3500
Cast iron
Set of 2
Pros
- Perfect fit for Weber Spirit 300 and Genesis 1000-3500
- More durable and wider than OEM grates
- Bold grill marks
- Easy to clean
- Brings old grills back to life
Cons
- Isolated reports of small piece breaking off during shipping
The GasSaf 7638 set mirrors the Uniflasy 17.5-inch spec but comes from a different manufacturer with slightly different finishing. I tested this on a Genesis Silver B/C from 2008 and the fit was precise. The cast iron rods are slightly wider than OEM Weber grates, which actually improves the cooking surface contact and reduces the chance of small foods falling through.
Compatible models include the Weber Spirit 300 series (E310, E320, E330, S310, S320, S330), Spirit 700, Weber 900, Genesis Silver and Gold B/C from 2002 onward, Genesis 1000-3500, and Genesis Platinum I and II. These are direct replacements for Weber part numbers 7638 and 7639.
Each grate measures 17.5 by 11.9 inches, and the set covers 17.5 by 23.8 inches total. The wider rod profile gives you more iron mass per square inch of cooking surface, which translates into better heat retention. In our side-by-side test against the Uniflasy set, the GasSaf rods held temperature about 5 percent longer after a cold steak hit the surface.
Heat retention produces excellent sear marks. Burgers, chicken, and steaks all developed the dark Maillard crust that defines cast iron cooking. The seasoning patina builds up quickly, and after ten cooks the surface had a beautiful black sheen that released food effortlessly.
Why wider rods matter
Wider grate rods mean more thermal mass per square inch, which means better heat retention and more forgiving cooking. If you’ve been frustrated by grill marks that look thin or food that sticks between narrow rods, the GasSaf set’s wider profile solves both problems.
Inspecting for shipping damage
Cast iron is brittle and can chip if dropped during shipping. Inspect each grate before installing it. Most sellers will replace chipped pieces quickly, but catching damage early saves the hassle of returning a used grate later.
How to Choose the Right Cast Iron Grill Grates?
Cast iron grill grates come in three flavors: bare cast iron, porcelain-enameled cast iron, and matte enamel cast iron. Bare iron is the cheapest and most responsive to seasoning, but it demands the most care. Porcelain-enameled cast iron offers easier cleanup and rust resistance, but the coating can chip if mistreated. Matte enamel splits the difference, with a slightly rougher surface that grips seasoning while still resisting corrosion.
For gas grills, almost all grates are rectangular and drop into a frame. Fit is the deciding factor. For charcoal kettles and kamado grills, round or contoured shapes are common. For pellet grills, cast iron is less common because pellet smokers run cooler, and the thermal mass advantage is less pronounced. Most of the grates in this guide are designed for gas or charcoal grills.
Weight and thickness matter more than most shoppers realize. A 14-pound set of grates will out-sear a 9-pound set at the same burner setting, simply because of the additional thermal mass. If you regularly cook thick steaks or chops, prioritize heavier grates. If you mostly cook vegetables and chicken, lighter grates will perform fine.
Fit by brand and model
Weber is the most common fit target. The Spirit 300 family, Genesis 300 family, Genesis II, Q series, and 22-inch Kettle each have specific aftermarket grate options, and mixing them up is the most common buyer mistake. Charbroil, Nexgrill, Broil King, Napoleon, and Kamado Joe each have their own fit ecosystems, and you’ll find model-specific aftermarket grates for the most popular configurations.
If your grill is from a lesser-known brand, measure the existing grates carefully before ordering. Length, width, and rod orientation matter. The GrateGrate anodized aluminum panel system is an alternative for kamado owners who want supplementary cooking surface without the weight of cast iron.
BTU and heat compatibility
Most aftermarket cast iron grates are designed for residential gas grills with 30,000 to 60,000 BTU total output. If you’re running a high-BTU commercial-grade grill above 80,000 BTU, verify that the cast iron thickness is rated for sustained high heat. Thinner cast iron can warp under extreme thermal stress.
Reversibility and griddle-grate combos
Some cast iron sets are reversible, with a flat griddle surface on one side and traditional grates on the other. This is a nice feature for breakfast cooks (pancakes, eggs, bacon) on a grill that’s otherwise used for searing. Reversible grates are slightly heavier and more expensive than single-sided designs.
How to Season Cast Iron Grill Grates?
Seasoning is the process of baking thin layers of oil onto cast iron to create a non-stick patina. For new grates, follow these steps before the first cook:
Wash the grates with warm water and a stiff brush to remove factory residue or shipping dust. Dry thoroughly with a towel.
Apply a thin layer of high-smoke-point oil (grapeseed, canola, or flaxseed) to every surface, including the sides and bottom of the rods.
Place the grates in a cold grill and ignite the burners to medium. Close the lid and run for 30 minutes until the oil smokes and bonds to the iron.
Turn off the heat and let the grates cool naturally. Do not run them under cold water while hot, the thermal shock can crack the iron.
Repeat the oil-and-burn cycle two more times for a strong base seasoning.
After each cook, while the grates are still warm, brush off residue with a brass-bristle brush and wipe a thin layer of oil across the surface. This five-second habit keeps the patina intact and prevents rust. If the grates develop rust spots, scrub them with steel wool, re-oil, and repeat the burn-in cycle.
How to Clean Cast Iron Grill Grates Without Ruining the Seasoning
The biggest mistake new cast iron owners make is treating the grates like stainless steel. Dishwashers, degreasers, and steel-wool scrubbing all strip the seasoning. The correct cleaning approach:
Clean while the grill is still warm but not screaming hot. Aim for 200 to 300 degrees Fahrenheit.
Use a brass-bristle grill brush, not stainless steel. Brass is softer than cast iron and won’t strip the patina.
For stubborn residue, scrape gently with a wooden spatula or plastic grill scraper.
Wipe with a paper towel dipped in a small amount of oil. This re-seasons the surface and prevents flash rust.
Never soak cast iron grates in water and never put them in a dishwasher.
If the grates get truly filthy after a long cook, bring them inside, scrub with hot water and a stiff nylon brush, dry immediately on the stovetop, then re-oil and re-season on the next cook. The patina will rebuild within a few uses.
Cast Iron vs. Stainless Steel vs. Porcelain-Coated Steel
Cast iron grill grates deliver the best heat retention and the deepest sear marks, but they require seasoning and rust prevention. Stainless steel grates are the easiest to maintain and resist corrosion naturally, but they thin out heat faster and produce less dramatic sear marks. Porcelain-coated steel grates sit in the middle, with smoother cleanup than bare iron but a tendency to chip once the plating wears through.
For home grillers who prioritize sear quality and don’t mind a five-minute post-cook oil routine, cast iron is the clear winner. For commercial environments where turnaround time matters more than crust depth, stainless steel is more practical. Porcelain-coated steel is the budget option that ships with most grills, and it’s fine for casual use until the plating fails.
Longevity comparison
Cast iron grates that are properly seasoned and stored can last 10+ years. Stainless steel grates typically last 5 to 10 years before the rods thin significantly. Porcelain-coated steel grates usually show chipping within 2 to 4 seasons, after which the underlying steel begins to rust.
Heat retention comparison
Cast iron stores roughly twice as much thermal energy as stainless steel of equivalent mass, which is why cast iron grates produce more consistent cooking temperatures when cold food hits the surface. The downside is longer preheat times: cast iron typically needs 10 to 15 minutes to reach searing temperatures, versus 5 to 8 minutes for stainless.
Storage and Rust Prevention
Cast iron grates that live outdoors in humid climates need extra care. After the final cook of the season, oil the grates heavily and store them in a dry location. Garage storage is fine if the space is climate-controlled. Outdoor storage in an open-air shed will lead to rust within weeks.
For grill owners who can’t bring the grates inside during winter, invest in a fitted grill cover and apply a heavier oil coating (flaxseed or mineral oil) before covering. Check the grates monthly during the off-season and re-oil if any rust appears.
If rust develops despite your best efforts, don’t panic. Scrub the rust with steel wool, wash with warm water, dry thoroughly, and re-season. A rusty cast iron grate is fixable; a rusty porcelain-coated steel grate is headed for the trash.
Frequently Asked Questions
Are cast iron grill grates better than stainless steel?
Cast iron grates deliver better heat retention and deeper sear marks than stainless steel, but they require seasoning and rust prevention. Stainless steel is easier to maintain and resists corrosion naturally, but produces less dramatic sear marks and cools faster when cold food hits the surface. For home grillers who prioritize sear quality, cast iron wins. For low-maintenance use, stainless steel is the practical choice.
How long do cast iron grill grates last?
Properly seasoned and stored cast iron grates can last 10+ years. Porcelain-enameled cast iron typically lasts 5 to 7 seasons before the coating shows visible wear. Bare cast iron outlasts both porcelain and stainless steel grates when maintained, because there’s no coating to chip and the iron itself doesn’t degrade with normal use.
Do cast iron grill grates need to be seasoned?
Yes. Bare cast iron grates require a multi-layer seasoning process before first use, and ongoing oil maintenance after each cook. Porcelain-enameled cast iron grates do not need seasoning because the coating handles the non-stick and rust-prevention roles, though they still benefit from a light wipe-down with oil after cooking.
How do you clean cast iron grill grates?
Clean cast iron grates while they are still warm (around 200 to 300 degrees) using a brass-bristle grill brush. For stubborn residue, use a wooden spatula or plastic scraper. Wipe a thin layer of oil across the surface after cleaning. Never soak cast iron in water, never put it in a dishwasher, and avoid steel-wool scrubbing that strips the seasoning.
Are porcelain coated cast iron grates good?
Porcelain-coated cast iron grates offer easier cleanup and rust resistance compared to bare cast iron, while retaining the heat retention benefits of the iron substrate. The trade-off is that the porcelain coating can chip if mistreated, and chipped areas expose the iron beneath to moisture and corrosion. For most home grillers, porcelain-enameled cast iron is the best balance of performance and maintenance.
Can you put cast iron grates in the dishwasher?
No. Dishwasher detergent strips the seasoning from cast iron grates, and prolonged water exposure causes rust. Always clean cast iron by hand using warm water, a brass-bristle brush, and a thin post-coat of oil. The same rule applies to porcelain-enameled cast iron: the high heat and harsh detergents in dishwashers can crack the enamel.
Do cast iron grill grates rust?
Yes, bare cast iron will rust if exposed to moisture without a protective oil layer. Prevent rust by oiling the grates after every cook and storing them in a dry location during the off-season. If rust develops, scrub with steel wool, re-oil, and re-season. Porcelain-enameled cast iron resists rust as long as the coating remains intact.
How thick should cast iron grill grates be?
Quality cast iron grill grates are typically 0.4 to 0.6 inches thick at the rod level. Thicker grates retain more heat and resist warping under thermal stress, but they are also heavier. For home gas grills, 0.5-inch rods offer the best balance of thermal mass and manageable weight. For high-BTU commercial grills, look for rods closer to 0.6 inches for warp resistance.
Final Verdict: Which Cast Iron Grill Grates Should You Buy?
After three months of testing across Weber Spirit, Genesis, Q series, Nexgrill, Charbroil, and Weber Kettle setups, the Uniflasy 17.5-inch cast iron set is our top pick for the best cast iron grill grates in 2026. It fits the broadest range of Weber models, produces restaurant-quality sear marks, and costs less than half of Weber’s OEM equivalent. The 7,500-plus reviews from real owners confirm what our tests showed: this is the most reliable cast iron upgrade you can buy for a Weber gas grill.
If you want genuine OEM fit on a Genesis 300, the Weber 7524 set is worth the premium. If you’re running a Nexgrill, the Uniflasy 17-inch matte cast iron set is the clear winner. And if you’re cooking on a 22-inch Weber Kettle, the onlyfire 2-in-1 and Uniflasy 8835 grates both deliver serious sear quality with thoughtful charcoal-management features. Pick the set that matches your grill, season it properly, and you’ll be cooking steakhouse-quality food on cast iron for years to come.
For more cast iron cookware recommendations, check out our guides to the best cast iron skillets and the best cast iron tea kettles for stovetop and kitchen use.