Gray Iron (Semi Steel)

Diameter: 4 to 12 inTread: 1-1/2, 2 and 3 inCapacity: 300 to 2,500 lb per wheel

Gray iron semi-steel wheels in semi-steel and ductile iron. Semi-steel on steel cores is the most common tread on these gray iron semi-steel wheels, rated 300 to 2,500 lb per wheel in 4, 5, 6, 8, 10 and 12 in. Ratings by tread: ductile iron 600 lb.

Gray iron semi-steel wheels by tread

Tread	Core	Wheel sizes	Rated per wheel	Listed temperature	Where it fits
Semi-steel	Steel	4 to 12 in	300 to 2,500 lb	-45°F to 600°F	rough floors, heat and heavy loads
Ductile iron	Steel	4 in	600 lb	Up to 800°F	heavy loads with better impact strength than cast iron

Ratings are for single wheels of gray iron semi-steel wheels, from product fields [S1].

Wheel sizes

Wheel	Treads	Rated
4 x 1-1/4 in	semi-steel	300 lb
4 x 1-1/2 in	ductile iron	600 lb
4 x 2 in	semi-steel	700 lb
5 x 2 in	semi-steel	1,000 lb
6 x 2 in	semi-steel	1,200 lb
8 x 2 in	semi-steel	1,400 to 2,500 lb
10 x 3 in	semi-steel	2,500 lb
12 x 3 in	semi-steel	2,500 lb

Choosing gray iron semi-steel wheels

Load: divide the loaded weight by three for a four-wheel cart [S2]; at 2,500 lb each, gray iron semi-steel wheels suit a loaded cart of about 7,500 lb.
Floor: on gray iron semi-steel wheels, semi-steel and ductile iron suit smooth concrete and heavy loads, but are loud and hard on tile and wood.
Heat: among gray iron semi-steel wheels, the highest listed range is up to 800°F on ductile iron; check the temperature field on each listing before oven or hot-room use.

Gray iron semi-steel wheels questions

How much weight can gray iron semi-steel wheels carry?

Single gray iron semi-steel wheels are rated 300 to 2,500 lb; most fall between 600 and 2,500 lb.

What wheel material is most common on gray iron semi-steel wheels?

Semi-steel leads on gray iron semi-steel wheels, rated 300 to 2,500 lb per wheel. Among gray iron semi-steel wheels, ductile iron is next at 600 lb.

Jordan Wilson, CasterHQ · reviewed October 20, 2026 · 844-439-4335 · info@casterhq.com

Sources

[S1] CasterHQ product fields (rated load, diameter, width, wheel and core material, temperature range, mount) and product descriptions for the items on this page, pulled October 20, 2026.
[S2] Preferred Equipment casters and wheels quick guide PDF (prefeq.com): load sizing on one less caster, wheel types and floor notes.

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