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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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Rubber Casters · 400-600 lb · 4" x 4-1/2" Plate

This collection holds Rubber On Steel Rs casters with metal and rubber wheels, built for shop carts, equipment, and material handling carts that move heavier loads. Casters in this collection range from 400 to 600 lb per caster. Wheels in this category range from 4 up to 8 inches in diameter with a 2 in tread width. The collection includes swivel and rigid models. Metal wheels roll with low effort and handle debris and heat. They are loud and can mark finished floors. Rubber wheels are quiet, cushion the load, and protect floors. Soft rubber or TPR 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 and rigid casters for straight travel. 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

4 types

Wheel = wheel diameter · capacity is per caster.

600 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 8" x 2" Rubber on Steel Swivel Caster - 600 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
8" x 2" Rubber on Steel Swivel Caster – 600 lb
Part # 30-S-820-RS-03
from $50.00
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"
Temp Range -40°F to 160°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 8" x 2" Rubber on Steel Swivel...
Shop Product
400 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 4" x 2" Rubber on Steel Swivel Caster - 400 lb Capacity, 4 x 4-1/2 Top Plate Durastar
Ships in 1-3 Business Days
4" x 2" Rubber on Steel Swivel Caster – 400 lb
Part # 30-S-420-RS-03
from $41.00
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"
Temp Range -40°F to 160°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 4" x 2" Rubber | Steel Swivel...
Shop Product
600 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 8" x 2" Rubber on Steel Rigid Caster - 600 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
8" x 2" Rubber on Steel Rigid Caster – 600 lb
Part # 30-R-820-RS-03
from $49.00
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"
Temp Range -40°F to 160°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 8" x 2" Rubber on Steel Rigid...
Shop Product
550 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 6" x 2" Rubberon Steel Swivel Caster - 550 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
6" x 2" Rubber on Steel Swivel Caster – 550 lb
Part # 30-S-620-RS-03
from $49.00
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 6-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Temp Range -40°F to 160°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 6" x 2" Rubber on Steel Swivel...
Shop Product
450 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 5" x 2" Rubber on Steel Swivel Caster - 450 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
5" x 2" Rubber on Steel Swivel Caster – 450 lb
Part # 30-S-520-RS-03
from $46.00
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"
Temp Range -45°F to 180°F
Rig Type Swivel
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 5" x 2" Rubber on Steel Swivel...
Shop Product
550 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 6" x 2" Rubber on Steel Rigid Caster - 550 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
6" x 2" Rubber on Steel Rigid Caster – 550 lb
Part # 30-R-620-RS-03
from $48.00
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 6-1/2"
Bolt Pattern 2-5/8" x 3-5/8" slotted to 3" x 3"
Temp Range -40°F to 160°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 6" x 2" Rubber on Steel Rigid...
Shop Product
450 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 5" x 2" Rubber on Steel Rigid Caster - 450 lb Capacity, 4 x 4-1/2 Top Plate | Choose Bearing Options Durastar
Ships in 1-3 Business Days
5" x 2" Rubber on Steel Rigid Caster – 450 lb
Part # 30-R-520-RS-03
from $45.00
Volume pricing available
RubberPlate
Load rating
450 lbs
Size5" x 2"
Capacity450 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"
Temp Range -45°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 5" x 2" Rubber on Steel Rigid...
Shop Product
400 lbs
TieredPricing
Durastar Medium Heavy Duty 30 Series - 4" x 2" Rubber on Steel Rigid Caster - 400 lb Capacity, 4 x 4-1/2 Top Plate Durastar
Ships in 1-3 Business Days
4" x 2" Rubber Steel Rigid Caster – 400 lb
Part # 30-R-420-RS-03
from $40.00
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"
Temp Range -40°F to 160°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
Durastar Medium Heavy Duty 30 Series - 4" x 2" Rubber | Steel Rigid...
Shop Product

Durastar rubber on steel casters by tread

Tread Core Wheel sizes Rated per caster Listed temperature Where it fits
Rubber 4, 5, 6 and 8 in 400 to 600 lb -40°F to 160°F cushioned and quiet on finished floors

Ratings are for single casters of Durastar rubber on steel casters, from product fields [S1].

Wheel sizes

Wheel Treads Rated
4 x 2 in rubber 400 lb
5 x 2 in rubber 450 lb
6 x 2 in rubber 550 lb
8 x 2 in rubber 600 lb

Choosing Durastar rubber on steel casters

  1. Load: plan on three casters carrying a four-caster cart [S2]; Durastar rubber on steel casters rated 600 lb each then carry about 1,800 lb.
  2. Mount: most Durastar rubber on steel casters use a 4 x 4-1/2 in top plate; match the bolt holes on your frame to the plate before ordering.
  3. Floor: on Durastar rubber on steel casters, rubber protects finished floors and runs quietly; check the rating if the cart also crosses rough concrete.
  4. Rig: swivel and rigid Durastar rubber on steel casters are listed.

Related to Durastar rubber on steel casters: 4 x 2 in rubber casters and 5 x 2 in rubber casters.

Durastar rubber on steel casters questions

How much weight can Durastar rubber on steel casters carry?

Single Durastar rubber on steel casters are rated 400 to 600 lb; most fall between 450 and 600 lb.

What top plate do Durastar rubber on steel casters use?

Most Durastar rubber on steel casters use 4 x 4-1/2 in.

What wheel material is most common on Durastar rubber on steel casters?

Rubber leads on Durastar rubber on steel casters, rated 400 to 600 lb per caster.

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.

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