8″ x 4″ Casters - UltraGlide Quad-Wheel & Forg

This collection holds 8 in x 4 in Casters with polyurethane, poly on iron and metal wheels, built for heavy equipment, dies, molds, and plant carts that move very heavy loads. Casters in this collection range from 550 to 27,200 lb per caster. Wheels in this category are 8 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. 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.

8″ x 4″ Casters - UltraGlide Quad-Wheel & Forg: buying guide

8 x 4 in casters in polyurethane, forged steel and steel, 8 in wheels, rated 3,850 to 27,200 lb per caster.

Diameter 8 inTread 4 inPlate 8-1/2 x 8-1/2 in (most)3,850 to 27,200 lb per caster

8 x 4 in casters by tread

Tread	Core	Wheel sizes	Rated per caster	Listed temperature	Where it fits
Polyurethane	Aluminum and Cast iron	8 in	3,850 to 27,200 lb	-50°F to 200°F	quiet, floor-friendly and long wearing
Forged steel	Steel	8 in	10,000 to 27,200 lb	-40°F to 320°F	very high loads and impact
Steel		8 in	5,500 to 27,200 lb	-30°F to 320°F	heavy loads and track

Ratings are for single casters of 8 x 4 in casters, from product fields [S1].

Choosing 8 x 4 in casters

Load: divide the loaded weight by three for a four-caster cart [S2]. A 18,000 lb caster from this page then suits about 54,000 lb, and the strongest at 27,200 lb about 81,600 lb.
Mount: most 8 x 4 in casters 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 8 x 4 in casters, polyurethane is kinder to tile and finished floors; forged steel and steel roll easier under heavy loads on smooth concrete.
Rig: swivel and rigid 8 x 4 in casters are listed.
Heat: among 8 x 4 in casters, 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.

8 x 4 in casters questions

How much weight can 8 x 4 in casters carry?

Single 8 x 4 in casters are rated 3,850 to 27,200 lb; most fall between 5,400 and 18,000 lb.

What top plate do 8 x 4 in casters use?

Most 8 x 4 in casters 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 8 x 4 in casters?

Polyurethane leads on 8 x 4 in casters, rated 3,850 to 27,200 lb per caster. Forged steel is next at 10,000 to 27,200 lb.

Are replacement wheels sold for 8 x 4 in casters?

Yes. Wheel-only listings for 8 x 4 in casters are here, sized 8 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