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Mold-On Rubber Casters | Bonded 2 in Tread

These mold on rubber casters bond rubber to an iron core for a quiet ride on shop and warehouse carts. Casters in this collection range from 350 to 600 lb per caster. Most use a 4 x 4-1/2 in top plate with 4 to 8 in wheels. Rubber protects finished floors and cushions the load. Soft rubber or TPR tread is the better pick when the floor has chips or grit. Match plate size, bolt pattern, and overall height before you order. Choose swivel casters when the cart must turn in place, rigid casters for straight travel, and add a brake when the cart needs to stay put. Capacities below are per caster unless a listing says set. Confirm the load rating printed on the title before you order. Read the listing for the exact wheel size, overall height, and mount shown. Rubber wheel aisle: rubber wheels. Plate aisle: plate casters.

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5 types

Capacity shown is per caster (per wheel for wheels).

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Mold-On Rubber Casters: buying guide

Mold-on rubber casters with rubber bonded to an iron hub, from CasterHQ and Hamilton. 4 to 8 x 2 in, rated 350 to 600 lb per caster, swivel and rigid.

4 to 8 in350 to 600 lb per casterRubber on ironSwivel and rigid

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The 14 casters

Size CasterHQ swivel / rigid Hamilton swivel / rigid
4 x 2 in 400 / 400 lb Not stocked
5 x 2 in 450 / 400 lb 350 / 350 lb
6 x 2 in 550 / 550 lb 410 / 410 lb
8 x 2 in 600 / 600 lb 500 / 500 lb

Product fields [S1]. Hamilton models list -30 to 160°F [S2].

How mold-on rubber differs

A solid rubber wheel is rubber all the way through. Mold-on rubber is bonded to an iron hub, so the hub carries the load and the tread will not spin on the core. OneMonroe lists mold-on rubber at about 70 Shore A and -30 to 160°F [S3], and Acorn's guide puts mold-on rubber in a 140 to 2,800 lb range across sizes [S4].

Good jobs for it

  • Hospital, school and office equipment where noise matters.
  • Carts on tile, sealed concrete or wood that has to stay unmarked.
  • Loads that need shock absorption, such as instruments and glass.

Limits

  • Rolling effort climbs with load. For 600 lb and up per caster on smooth floors, polyurethane pushes easier.
  • Oil, grease and solvents attack rubber.
  • Black rubber can mark light floors. Ask about gray treads if that matters.

Mold-on rubber caster questions

What is a mold-on rubber caster?

A caster whose rubber tread is molded and bonded directly to an iron hub, so the tread cannot slip on the core.

How much do mold-on rubber casters hold?

On this page, 350 to 600 lb per caster depending on size and maker.

Are mold-on rubber casters quiet?

Yes. The rubber tread is quieter than polyurethane, nylon or metal.

What plate do they use?

The CasterHQ models use a 4 x 4-1/2 in plate. Check the Hamilton listings for their plate size.

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] Hamilton S-MS and R-MS mold-on rubber caster listings on CasterHQ: 5, 6 and 8 x 2 in rubber on cast iron, 350 to 500 lb, -30 to 160°F, roller bearings.
  • [S3] OneMonroe caster wheel selection guide (monroeengineering.com): mold-on rubber about 70 Shore A, -30 to 160°F.
  • [S4] Acorn standard wheel selection guide PDF (acornindprod.com): mold-on rubber 140 to 2,800 lb; phenolic -65 to 250°F.

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