Poly on Aluminum Casters · 4" to 8" · 1,000 to 1,500 lb · Polyurethane

These poly on aluminum casters carry tool boxes, carts, and plant trucks on finished floors. Casters in this collection range from 1,000 to 1,250 lb per caster. Sets of 4 are rated 4,000 to 5,000 lb per set. Wheels in this category range from 4 up to 8 in by 2 in wide on 4 x 4-1/2 in plates, with total lock options. Sets of 4 show the combined set rating on the title, so divide by 4 for the per caster load. Polyurethane (poly or urethane) on an aluminum core is light, quiet, and floor safe. The aluminum hub will not rust. Soft polyurethane on aluminum (~85 Shore A) or TPR is the better pick when the floor has chips or grit. Match the 4 x 4-1/2 in plate, bolt pattern, and overall height before you order. Brakes help on ramps. Check the floor first. Polyurethane wheel aisle: polyurethane wheels. Total lock aisle: total locking casters.

Poly on Aluminum Casters: buying guide

Polyurethane on aluminum casters in polyurethane and ductile iron, 4 to 8 in wheels, rated 1,000 to 1,500 lb per caster.

Diameter 4 to 8 inTread 2 inPlate 4 x 4-1/2 in1,000 to 1,500 lb per caster

Polyurethane on aluminum casters by tread

Tread	Core	Wheel sizes	Rated per caster	Listed temperature	Where it fits
Polyurethane	Aluminum	4, 5, 6 and 8 in	1,000 to 1,250 lb	Up to 180°F	quiet, floor-friendly and long wearing
Ductile iron	Steel	5 in	1,500 lb	-45°F to 800°F	heavy loads with better impact strength than cast iron

Ratings are for single casters of polyurethane on aluminum casters, from product fields [S1].

Wheel sizes

Wheel	Treads	Rated
4 x 2 in	polyurethane	1,000 to 1,250 lb
5 x 2 in	polyurethane and ductile iron	1,200 to 1,500 lb
6 x 2 in	polyurethane	1,250 lb
8 x 2 in	polyurethane	1,250 lb

Choosing polyurethane on aluminum casters

Load: divide the loaded weight by three for a four-caster cart [S2]. A 1,250 lb caster from this page then suits about 3,750 lb, and the strongest at 1,500 lb about 4,500 lb.
Mount: most polyurethane on aluminum casters use a 4 x 4-1/2 in top plate; match the bolt holes on your frame to the plate before ordering.
Floor: on polyurethane on aluminum casters, polyurethane is kinder to tile and finished floors; ductile iron rolls easier under heavy loads on smooth concrete.
Rig: swivel and rigid polyurethane on aluminum casters are listed, with total lock brake options.
Heat: among polyurethane on aluminum casters, the highest listed range is -45°F to 800°F on ductile iron; check the temperature field on each listing before oven or hot-room use.

Related: caster wheels.

Polyurethane on aluminum casters questions

How much weight can polyurethane on aluminum casters carry?

Single polyurethane on aluminum casters are rated 1,000 to 1,500 lb; most fall between 1,200 and 1,250 lb.

What top plate do polyurethane on aluminum casters use?

Most polyurethane on aluminum casters use 4 x 4-1/2 in.

What wheel material is most common on polyurethane on aluminum casters?

Polyurethane leads on polyurethane on aluminum casters, rated 1,000 to 1,250 lb per caster. Ductile iron is next at 1,500 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.

BHP: 1-3/4″ × 2-7/8″, slotted to 3″

BHP: 1-3/4″ × 2-15/16″ slotted to 2-3/8″ × 3-3/8″

BHP: 2-5/8” X 3-5/8” (Slotted to 3” x 3”)

BHP: 2-7/16" x 4-15/16" slotted to 3-3/8" x 5-1/4"

(3″ Wide Casters), Industry-Standard

BHP: 3-3/8" x 5-1/4" slotted to 4-1/8" x 6-1/8"

BHP: 4-1/8" x 6" slotted to 4-1/2" x 6-1/8"

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