12" x 4" Casters & Wheels · Heavy Transfer Carts & Tow-Line Trailers

This collection holds 12 in x 4 in Casters with polyurethane, poly on iron and rubber wheels, built for heavy equipment, dies, molds, and plant carts that move very heavy loads. Casters in this collection range from 1,200 to 36,800 lb per caster. Wheels in this category are 12 inches in diameter with 4 in tread width. The collection includes swivel, rigid, and brake models. Kingpinless swivels hold up better under shock and repeat loads. Polyurethane (poly or urethane) treads are quiet, floor safe, and resist water and many chemicals. Rubber wheels are quiet, cushion the load, and protect floors. Softer poly or TPR is the better pick when the floor has chips or grit. Plate and stem mounts are listed on each product so you can match bolt pattern or stem size before you order. Choose swivel casters when the cart must turn in place and rigid casters for straight travel. Polyurethane aisle: polyurethane casters. Wheel hub: replacement wheels.

Shop by wheel material

4 types

Rubber and polyurethane favor floor protection; phenolic and steel favor heavy capacity. Compare materials →

12" x 4" Casters & Wheels: buying guide

12 x 4 in casters and wheels in polyurethane, rubber and forged steel, 12 in wheels, rated 1,200 to 36,800 lb per caster.

Diameter 12 inTread 4 inPlate 8-1/2 x 8-1/2 in (most)1,200 to 36,800 lb per caster

12 x 4 in casters and wheels by tread

Tread	Core	Wheel sizes	Rated per caster	Listed temperature	Where it fits
Polyurethane	Steel and Aluminum	12 in	2,775 to 36,800 lb	-5°F to 160°F	quiet, floor-friendly and long wearing
Rubber	Cast iron and Steel	12 in	1,200 to 2,100 lb	-30°F to 160°F	cushioned and quiet on finished floors
Forged steel		12 in	20,000 to 36,800 lb	-40°F to 320°F	very high loads and impact
Nylon		12 in	10,000 to 16,000 lb	-30°F to 220°F	low rolling effort on smooth floors, handles wet areas
Steel		12 in	6,250 to 36,800 lb	-40°F to 320°F	heavy loads and track
Phenolic		12 in	6,000 to 10,000 lb	Up to 250°F	hard and easy rolling on smooth, dry floors
Pneumatic	Steel	12 in	Not listed	-30°F to 120°F	rough ground, outdoors, fragile loads

Ratings are for single casters of 12 x 4 in casters and wheels, from product fields [S1].

Choosing 12 x 4 in casters and wheels

Load: plan on three casters carrying a four-caster cart [S2]; at 11,000 lb each, a common rating here, that is about 33,000 lb, and the 36,800 lb top rating covers about 110,400 lb.
Mount: most 12 x 4 in casters and wheels use a 8-1/2 x 8-1/2 in top plate; 14 x 14 in and 6-1/2 x 7-1/2 in plates are listed too; measure bolt hole centers on the old plate and compare.
Floor: on 12 x 4 in casters and wheels, polyurethane, rubber and pneumatic are kinder to tile and finished floors; forged steel, nylon, steel and phenolic roll easier under heavy loads on smooth concrete.
Rig: swivel and rigid 12 x 4 in casters and wheels are listed.
Heat: among 12 x 4 in casters and wheels, the highest listed range is -40°F to 320°F on forged steel; check the temperature field on each listing before oven or hot-room use.

12 x 4 in casters and wheels questions

How much weight can 12 x 4 in casters and wheels carry?

Single 12 x 4 in casters and wheels are rated 1,200 to 36,800 lb; most fall between 5,500 and 11,000 lb.

What top plate do 12 x 4 in casters and wheels use?

Most 12 x 4 in casters and wheels use 8-1/2 x 8-1/2 in. Others listed: 14 x 14 in and 6-1/2 x 7-1/2 in.

What wheel material is most common on 12 x 4 in casters and wheels?

Polyurethane leads on 12 x 4 in casters and wheels, rated 2,775 to 36,800 lb per caster. Rubber is next at 1,200 to 2,100 lb.

Are replacement wheels sold for 12 x 4 in casters and wheels?

Yes. Wheel-only listings for 12 x 4 in casters and wheels are here, sized 12 in; check the axle diameter and hub length on the old wheel.

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"

View All • 21 Plate Sizes

Plate Casters

Stem Casters

Stainless Casters

Ergonomic Casters

Leveling Casters