91 Series

This collection holds 91 Series casters with metal, polyurethane and forged steel wheels, built for heavy equipment, dies, molds, and plant carts that move very heavy loads. Casters in this collection range from 750 to 6,000 lb per caster. Wheels in this category range from 6 up to 12 inches in diameter with a 3 in tread width. The collection includes swivel models. Metal wheels roll with low effort and handle debris and heat. They are loud and can mark finished floors. Polyurethane (poly or urethane) treads are quiet, floor safe, and resist water and many chemicals. Forged steel wheels carry very heavy loads and handle impact, debris, and heat. They are loud and will mark finished floors. Match plate size, bolt pattern, and overall height before you order. Read the listing for the exact wheel size, overall height, and mount shown. Forged steel aisle: forged steel casters. Wheel hub: replacement wheels.

Shop by type

7 types

Wheel = wheel diameter · capacity is per caster.

Durastar 91 series casters by tread

Tread	Core	Wheel sizes	Rated per caster	Listed temperature	Where it fits
Polyurethane	Steel	6, 8, 10 and 12 in	2,000 to 4,500 lb	-45°F to 180°F	quiet, floor-friendly and long wearing
Ductile iron	Steel	6, 8, 10 and 12 in	2,000 to 6,000 lb	-45°F to 800°F	heavy loads with better impact strength than cast iron
Rubber		6, 8, 10 and 12 in	750 to 1,300 lb	-40°F to 160°F	cushioned and quiet on finished floors
Nylon		6, 8 and 10 in	2,000 to 3,000 lb	Up to 180°F	low rolling effort on smooth floors, handles wet areas
Semi-steel		8 and 10 in	2,500 to 3,000 lb	-45°F to 800°F	rough floors, heat and heavy loads
Phenolic		6 and 12 in	2,000 to 3,500 lb	Up to 250°F	hard and easy rolling on smooth, dry floors

Ratings are for single casters of Durastar 91 series casters, from product fields [S1].

Wheel sizes

Wheel	Treads	Rated
6 x 3 in	polyurethane, rubber and phenolic	750 to 2,000 lb
8 x 3 in	polyurethane, semi-steel and rubber	900 to 6,000 lb
10 x 3 in	ductile iron, semi-steel and rubber	1,100 to 6,000 lb
12 x 3 in	polyurethane, rubber and phenolic	1,300 to 6,000 lb

Choosing Durastar 91 series casters

Load: plan on three casters carrying a four-caster cart [S2]; at 3,500 lb each, a common rating here, that is about 10,500 lb, and the 6,000 lb top rating covers about 18,000 lb.
Mount: most Durastar 91 series casters use a 4-1/2 x 6-1/4 in top plate; check the bolt spacing on your frame against the plate size.
Floor: on Durastar 91 series casters, polyurethane and rubber are kinder to tile and finished floors; ductile iron, nylon, semi-steel and phenolic roll easier under heavy loads on smooth concrete.
Rig: swivel Durastar 91 series casters are listed.
Heat: among Durastar 91 series 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 to Durastar 91 series casters: polyurethane casters and 8 x 3 in polyurethane casters.

Durastar 91 series casters questions

How much weight can Durastar 91 series casters carry?

Single Durastar 91 series casters are rated 750 to 6,000 lb; most fall between 2,000 and 3,500 lb.

What top plate do Durastar 91 series casters use?

Most Durastar 91 series casters use 4-1/2 x 6-1/4 in.

What wheel material is most common on Durastar 91 series casters?

Polyurethane leads on Durastar 91 series casters, rated 2,000 to 4,500 lb per caster. Among Durastar 91 series casters, ductile iron is next at 2,000 to 6,000 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"

View All • 21 Plate Sizes

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