Red Poly on Iron Casters - HD Spec, 1,100-5,00

These red poly on iron casters carry tool boxes, carts, and plant trucks on finished floors. Casters in this collection range from 700 to 1,250 lb per caster. Sets of 4 are rated 2,800 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 iron protects floors and keeps rolling effort low under load. Softer polyurethane or soft rubber or TPR tread 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. Check the floor first. Check the floor type and the heaviest load the cart will carry before you choose. Polyurethane wheel aisle: polyurethane wheels. Tool box aisle: tool box casters.

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4 types

Wheel = wheel diameter · capacity is per caster.

Red Poly on Iron Casters - HD Spec, 1,100-5,00: buying guide

Red polyurethane on iron casters in polyurethane, 4 to 8 in wheels, rated 800 to 1,250 lb per caster.

Diameter 4 to 8 in Tread 2 in Plate 4 x 4-1/2 in 800 to 1,250 lb per caster

Red polyurethane on iron casters by tread

Tread	Core	Wheel sizes	Rated per caster	Listed temperature	Where it fits
Polyurethane	Cast iron	4, 5, 6 and 8 in	800 to 1,250 lb	-40°F to 180°F	quiet, floor-friendly and long wearing

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

Wheel sizes

Wheel	Treads	Rated
4 x 2 in	polyurethane	800 lb
5 x 2 in	polyurethane	800 to 1,100 lb
6 x 2 in	polyurethane	900 to 1,200 lb
8 x 2 in	polyurethane	900 to 1,250 lb

Choosing red polyurethane on iron casters

Load: plan on three casters carrying a four-caster cart [S2]; at 1,100 lb each, a common rating here, that is about 3,300 lb, and the 1,250 lb top rating covers about 3,750 lb.
Mount: most red polyurethane on iron casters use a 4 x 4-1/2 in top plate; check the bolt spacing on your frame against the plate size.
Floor: on red polyurethane on iron casters, polyurethane protects finished floors and runs quietly; check the rating if the cart also crosses rough concrete.
Rig: swivel and rigid red polyurethane on iron casters are listed, with total lock brake, side lock brake and top lock brake options.

Red polyurethane on iron casters questions

How much weight can red polyurethane on iron casters carry?

Single red polyurethane on iron casters are rated 800 to 1,250 lb; most fall between 800 and 1,100 lb.

What top plate do red polyurethane on iron casters use?

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

What wheel material is most common on red polyurethane on iron casters?

Polyurethane leads on red polyurethane on iron casters, rated 800 to 1,250 lb per caster.

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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