Polyurethane Casters, 4 x 4-1/2 Plate

Diameter: 4 to 8 inTread: 2 inPlate: 4 x 4-1/2 inCapacity: 1,250 lb per caster

This page lists polyurethane casters on a 4 x 4-1/2 in plate. Polyurethane on cast iron and aluminum cores is the most common tread here, rated 1,250 lb per caster in 4, 5, 6 and 8 in. Sets of 4 list 4,800 to 5,000 lb combined.

Polyurethane casters on a 4 x 4-1/2 in plate by tread

Tread	Core	Wheel sizes	Rated per caster	Listed temperature	Where it fits
Polyurethane	Cast iron and Aluminum	4, 5, 6 and 8 in	1,250 lb	-50°F to 180°F	quiet, floor-friendly and long wearing

Ratings are for single casters of polyurethane casters on a 4 x 4-1/2 in plate, from product fields [S1].

Wheel sizes

Wheel	Treads	Rated
4 x 2 in	polyurethane	1,250 lb
5 x 2 in	polyurethane	1,250 lb
6 x 2 in	polyurethane	1,250 lb
8 x 2 in	polyurethane	1,250 lb

Choosing polyurethane casters on a 4 x 4-1/2 in plate

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

Polyurethane casters on a 4 x 4-1/2 in plate questions

How much weight can polyurethane casters on a 4 x 4-1/2 in plate carry?

Single polyurethane casters on a 4 x 4-1/2 in plate are rated 1,250 lb.

What top plate do polyurethane casters on a 4 x 4-1/2 in plate use?

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

What wheel material is most common on polyurethane casters on a 4 x 4-1/2 in plate?

Polyurethane leads on polyurethane casters on a 4 x 4-1/2 in plate, rated 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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