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All measurements indicate the wheel diameter by the tread width.

The below capacity ranges indicate the working (dynamic) load that each caster will support. A safety factor should be included in your formula to determine your required load rating per caster.

W/(C-1)=R W is total weight needed to move. C is total number of casters required. R is ideal load rating, with safety factor built in. Divide the total load weight by one less caster than you will use to safely determine load rating.

Plate dimensions shown are overall mounting plate size.
When replacing existing casters, select the closest plate size and verify bolt-hole compatibility.
BHP = Bolt Hole Pattern, shown under each plate.

BHP: 1-3/4″ × 2-7/8″, slotted to 3″
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: 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: 2-5/8” 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"
BHP: 2-7/16" x 4-15/16" slotted to 3-3/8" x 5-1/4"
(3″ Wide Casters), Industry-Standard
(3″ Wide Casters), Industry-Standard
BHP: 3-3/8" x 5-1/4" slotted to 4-1/8" x 6-1/8"
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"
BHP: 4-1/8" x 6" slotted to 4-1/2" x 6-1/8"
View All • 21 Plate Sizes
View All • 21 Plate Sizes
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Mold-On Rubber Casters | Bonded 2 in Tread

Diameter: 4 to 8 inTread: 2 inCapacity: 350 to 600 lb each
Mold-on rubber casters have a rubber tread molded straight onto an iron hub, so the tread cannot slip on the core and the iron carries the load. CasterHQ models run from 400 lb at 4 in to 600 lb at 8 in on a 4 x 4-1/2 in plate, and Hamilton S-MS and R-MS models from 350 to 500 lb with roller bearings. The rubber is quiet and easy on floors. It carries less than polyurethane of the same size and is not for oil or high heat.

Shop by caster type

5 types

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

Caster Finder Find your caster in 3 steps Mount, size, capacity, narrowed to your exact spec in this collection.
400 lbs
TieredPricing
4 Inch x 2 Inch Swivel Caster - 400 lbs Capacity | Mold-On Rubber Wheel Plate Mount CasterHQ
In Stock · Same/Next Day
4" x 2" Mold-On Rubber Swivel Caster – 400 lb
Part # CB-9SC4-RI
from $24.00
Volume pricing available
RubberPlate
Load rating
400 lbs
Size4" x 2"
Capacity400 lbs
WheelRubber
MountPlate 4" x 4-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 5-5/8"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Iron
Temp Range -40°F to 180°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
4" x 2" Inch Swivel Caster - Mold-On Rubber Wheel - 400 Lbs Capacity...
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400 lbs
TieredPricing
4" x 2" Inch Rigid Caster - Mold-On Rubber Wheel - 400 Lbs Capacity CasterHQ
In Stock · Same/Next Day
4" x 2" Mold-On Rubber Rigid Caster 4" x 4-1/2" Plate – 400 lb
Part # CB-9RC4-RI
from $23.00
Volume pricing available
RubberPlate
Load rating
400 lbs
Size4" x 2"
Capacity400 lbs
WheelRubber
MountPlate 4" x 4-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 5-5/8"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Iron
Temp Range -40°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
4" x 2" Inch Rigid Caster - Mold-On Rubber Wheel - 400 Lbs CapacityOur...
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450 lbs
TieredPricing
5 Inch x 2 Inch Swivel Caster - 450 lbs Capacity | Mold-On Rubber Wheel Plate Mount CasterHQ
In Stock · Same/Next Day
5" x 2" Mold-On Rubber Swivel Caster – 450 lb
Part # CB-9SC5-RI
from $25.00
Volume pricing available
RubberPlate
Load rating
450 lbs
Size5" x 2"
Capacity450 lbs
WheelRubber
MountPlate 4" x 4-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 6-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Iron
Temp Range -40°F to 180°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
5" x 2" Inch Swivel Caster - Mold-On Rubber Wheel - 450 Lbs Capacity...
Shop Product
400 lbs
TieredPricing
5" x 2" Inch Rigid Caster - Mold-On Rubber Wheel - 400 Lbs Capacity CasterHQ
In Stock · Same/Next Day
5" x 2" Mold-On Rubber Rigid Caster – 400 lb
Part # CB-9RC5-RI
from $23.00
Volume pricing available
RubberPlate
Load rating
400 lbs
Size5" x 2"
Capacity400 lbs
WheelRubber
MountPlate 4" x 4-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 6-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Iron
Temp Range -40°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
5" x 2" Inch Rigid Caster - Mold-On Rubber Wheel - 400 Lbs Capacity...
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550 lbs
TieredPricing
6 Inch x 2 Inch Swivel Caster - 550 lbs Capacity | Mold-On Rubber Wheel | NSF Listed Food Safe CasterHQ
In Stock · Same/Next Day
6" x 2" Mold-On Rubber Swivel Caster – 550 lb
Part # CB-9SC6-RI
from $38.00
Volume pricing available
RubberPlate
Load rating
550 lbs
Size6" x 2"
Capacity550 lbs
WheelRubber
MountPlate 4" x 4-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 7-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Iron
Temp Range -40°F to 180°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
6" x 2" Swivel Caster | Mold-On Rubber Wheel | 550 lbs CapacityThis 6-inch...
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550 lbs
TieredPricing
6" x 2" Inch Rigid Caster - Mold-On Rubber Wheel - 550 Lbs Capacity CasterHQ
In Stock · Same/Next Day
6" x 2" Mold-On Rubber Rigid Caster – 550 lb
Part # CB-9RC6-RI
from $32.00
Volume pricing available
RubberPlate
Load rating
550 lbs
Size6" x 2"
Capacity550 lbs
WheelRubber
MountPlate 4" x 4-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 7-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Iron
Temp Range -40°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
6" x 2" Inch Rigid Caster - Mold-On Rubber Wheel - 550 Lbs CapacityOur...
Shop Product
600 lbs
Sale
TieredPricing
8 Inch x 2 Inch Swivel Caster - 600 lbs Capacity | Mold-On Rubber Wheel | NSF Listed Food Safe CasterHQ
In Stock · Same/Next Day
8" x 2" Mold-On Rubber Swivel Caster – 600 lb
Part # CB-9SC8-RI
List  $41.00 USD from $36.00
Volume pricing available
RubberPlate
Load rating
600 lbs
Size8" x 2"
Capacity600 lbs
WheelRubber
MountPlate 4" x 4-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 9-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Iron
Temp Range -40°F to 180°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
8" x 2" Swivel Caster | Mold-On Rubber Wheel | 600 lbs CapacityThis heavy-duty...
Shop Product
600 lbs
Sale
TieredPricing
8 Inch x 2 Inch Rigid Caster - 600 lbs Capacity | Mold-On Rubber Wheel Heavy Duty CasterHQ
In Stock · Same/Next Day
8" x 2" Mold-On Rubber Rigid Caster – 600 lb
Part # CB-9RC8-RI
List  $40.00 USD from $32.00
Volume pricing available
RubberPlate
Load rating
600 lbs
Size8" x 2"
Capacity600 lbs
WheelRubber
MountPlate 4" x 4-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 9-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Core Iron
Temp Range -40°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Our Medium Duty '9' Series is one of the most recognized and commonly used...
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350 lbs
TieredPricing
Hamilton S-MS-5R Medium Service Swivel Caster - 5x2 Inch Mold-On Rubber Wheel, Cast Iron Core, 3/4" Roller Bearing for Smooth Operation Hamilton
Made to Order · 4-6 Wk
Hamilton S-MS-5R 5" x 2" Mold-On Rubber Swivel Caster – 350 lb
Part # S-MS-5R
from $114.00
Volume pricing available
RubberPlate
Load rating
350 lbs
Size5" x 2"
Capacity350 lbs
WheelRubber
MountPlate 5" x 5-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 6-1/2"
Bolt Pattern 4" x 4" and 4-1/8" x 4-1/2"
Core Cast Iron
Temp Range -30°F to 160°F
Rig Type Swivel
Brake No Brake
Frame Bright Zinc Plated
Hamilton S-MS-5R Swivel Caster | 5" Mold-On Rubber Wheel for Enhanced Mobility Hamilton S-MS-5R...
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350 lbs
TieredPricing
Hamilton R-MS-5R Medium Service Rigid Caster - 5x2 Inch Mold-On Rubber Wheel, Cast Iron Core, 3/4" Roller Bearing for Smooth Operation Hamilton
Made to Order · 4-6 Wk
Hamilton R-MS-5R 5" x 2" Mold-On Rubber Rigid Caster – 350 lb
Part # R-MS-5R
from $94.00
Volume pricing available
RubberPlate
Load rating
350 lbs
Size5" x 2"
Capacity350 lbs
WheelRubber
MountPlate 5" x 5-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 6-1/2"
Bolt Pattern 4" x 4" and 4-1/8" x 4-1/2"
Core Cast Iron
Temp Range -30°F to 160°F
Rig Type Rigid
Brake No Brake
Frame Bright Zinc Plated
Hamilton S-MS-5R Swivel Caster | 5" Mold-On Rubber Wheel for Enhanced Mobility Hamilton R-MS-5R...
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410 lbs
TieredPricing
Hamilton S-MS-6R Medium Service Swivel Caster - 6x2 Inch Mold-On Rubber on Cast Iron Wheel with Roller Bearings Hamilton
Made to Order · 4-6 Wk
Hamilton S-MS-6R 6" x 2" Mold-On Rubber Swivel Caster – 410 lb
Part # S-MS-6R
from $103.00
Volume pricing available
RubberPlate
Load rating
410 lbs
Size6" x 2"
Capacity410 lbs
WheelRubber
MountPlate 5" x 5-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 7-1/2"
Bolt Pattern 4" x 4" and 4-1/8" x 4-1/2"
Core Cast Iron
Temp Range -30°F to 160°F
Rig Type Swivel
Brake No Brake
Frame Bright Zinc Plated
Hamilton S-MS-6R Medium Service Swivel Caster | 6" x 2" Rubber on Cast Iron...
Shop Product
410 lbs
TieredPricing
Hamilton R-MS-6R Medium Service Rigid Caster - 6x2 Inch Mold-On Rubber on Cast Iron Wheel with Roller Bearings Hamilton
Made to Order · 4-6 Wk
Hamilton R-MS-6R 6" x 2" Mold-On Rubber Rigid Caster – 3/4" Roller Bearing
Part # R-MS-6R
from $92.00
Volume pricing available
RubberPlate
Load rating
410 lbs
Size6" x 2"
Capacity410 lbs
WheelRubber
MountPlate 5" x 5-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 7-1/2"
Bolt Pattern 4" x 4" and 4-1/8" x 4-1/2"
Core Cast Iron
Temp Range -30°F to 160°F
Rig Type Rigid
Brake No Brake
Frame Bright Zinc Plated
Hamilton S-MS-6R Medium Service Swivel Caster | 6" x 2" Rubber on Cast Iron...
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500 lbs
TieredPricing
Hamilton S-MS-8R Medium Service Swivel Caster - 8" x 2" Mold-On Rubber Wheel, 3/4" Roller Bearing Hamilton
Made to Order · 4-6 Wk
Hamilton S-MS-8R 8" x 2" Mold-On Rubber Swivel Caster – 500 lb
Part # S-MS-8R
from $112.00
Volume pricing available
RubberPlate
Load rating
500 lbs
Size8" x 2"
Capacity500 lbs
WheelRubber
MountPlate 5" x 5-1/2"
TypeSwivel
More Details Less Details
Width 2"
Height 9-1/2"
Bolt Pattern 4" x 4" and 4-1/8" x 4-1/2"
Core Cast Iron
Temp Range -30°F to 160°F
Rig Type Swivel
Brake No Brake
Frame Bright Zinc Plated
S-MS-8R Hamilton Medium Service Swivel Caster with Mold-On Rubber Wheel 8" x 2" Mold-On...
Shop Product
500 lbs
TieredPricing
Hamilton R-MS-8R Medium Service Rigid Caster - 8" x 2" Mold-On Rubber Wheel, 3/4" Roller Bearing Hamilton
Made to Order · 4-6 Wk
Hamilton R-MS-8R 8" x 2" Mold-On Rubber Rigid Caster – 500 lb
Part # R-MS-8R
from $98.00
Volume pricing available
RubberPlate
Load rating
500 lbs
Size8" x 2"
Capacity500 lbs
WheelRubber
MountPlate 5" x 5-1/2"
TypeRigid
More Details Less Details
Width 2"
Height 9-1/2"
Bolt Pattern 4" x 4" and 4-1/8" x 4-1/2"
Core Cast Iron
Temp Range -30°F to 160°F
Rig Type Rigid
Brake No Brake
Frame Bright Zinc Plated
R-MS-8R Hamilton Medium Service Rigid Caster with Mold-On Rubber Wheel 8" x 2" Mold-On...
Shop Product

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

Shop Mold-On Rubber Casters

4 x 2 Mold-On Rubber Swivel Ca...
4" x 2" Mold-On Rubber Swivel Ca...
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4 x 2 Mold-On Rubber Rigid Cas...
4" x 2" Mold-On Rubber Rigid Cas...
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5 x 2 Mold-On Rubber Swivel Ca...
5" x 2" Mold-On Rubber Swivel Ca...
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5 x 2 Mold-On Rubber Rigid Cas...
5" x 2" Mold-On Rubber Rigid Cas...
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6 x 2 Mold-On Rubber Swivel Ca...
6" x 2" Mold-On Rubber Swivel Ca...
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6 x 2 Mold-On Rubber Rigid Cas...
6" x 2" Mold-On Rubber Rigid Cas...
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8 x 2 Mold-On Rubber Swivel Ca...
8" x 2" Mold-On Rubber Swivel Ca...
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8 x 2 Mold-On Rubber Rigid Cas...
8" x 2" Mold-On Rubber Rigid Cas...
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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.

Wheels only: rubber wheels.

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.

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] 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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