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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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Caster Wheel Materials & Selection Guide

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4 Inch Solid Polyurethane Wheel Casters 3-8 Inch Wheels

Diameter: 4 inTread: 2 inPlate: 4 x 4-1/2 inCapacity: 300 to 450 lb per caster
4 inch solid polyurethane wheel casters 3-8 inch wheels in rubber. Rubber on polyolefin cores is the most common tread on these 4 inch solid polyurethane wheel casters 3-8 inch wheels, rated 300 to 450 lb per caster. Replacement wheels are listed too, rated 450 lb each.
300 lbs
TieredPricing
4" x 2" Crowned Thermo Plastic Rubber Wheel - Rigid Caster - 4" x 4-1/2" Plate Size - 300 lbs Capacity CasterHQ
In Stock · Same/Next Day
4" x 2" Thermo Rubber Rigid Caster – 300 lb
Part # 30CR420DTR38X-03
from $26.00
Volume pricing available
Gray RubberPlate
Load rating
300 lbs
Size4" x 2"
Capacity300 lbs
WheelGray Rubber
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 Polyolefin
Temp Range -40°F to 180°F
Rig Type Rigid
Brake No Brake
Frame Zinc Plated Steel
4" x 2" Crowned Thermo Plastic Rubber Wheel - Rigid Caster - 4" x...
Shop Product
450 lbs
TieredPricing
4" x 2" Swivel with Brake | Flat Tread Thermo Plastic Rubber Wheel | 4" x 4-1/2" Plate Size | 450 lbs Capacity CasterHQ
In Stock · Same/Next Day
4" x 2" Thermo Rubber Swivel Caster with Brake – 450 lb
Part # 30TS420PPR84X-03
from $38.00
Volume pricing available
Gray RubberPlate
Load rating
450 lbs
Size4" x 2"
Capacity450 lbs
WheelGray Rubber
MountPlate 4" x 4-1/2"
TypeSwivel with Brake · Side Lock Brake
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 Polyolefin
Temp Range -40°F to 180°F
Rig Type Swivel with Brake
Brake Side Lock Brake
Frame Zinc Plated Steel
4" x 2" Swivel with Brake | Flat Tread Thermo Plastic Rubber Wheel |...
Shop Product
300 lbs
TieredPricing
4" x 2" Crowned Thermo Plastic Rubber Wheel - 4" x 4-1/2" Plate Size - 300 lbs Capacity CasterHQ
In Stock · Same/Next Day
4" x 2" Thermo Rubber Swivel Caster – 300 lb
Part # 30CS420DTR38X-03
from $30.00
Volume pricing available
Gray RubberPlate
Load rating
300 lbs
Size4" x 2"
Capacity300 lbs
WheelGray Rubber
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 Polyolefin
Temp Range -40°F to 180°F
Rig Type Swivel
Frame Zinc Plated Steel
4" x 2" Crowned Thermo Plastic Rubber Wheel - 4" x 4-1/2" Plate Size...
Shop Product
450 lbs
TieredPricing
4" x 2" Duratek High Tech Flat Tread Thermo Plastic Rubber Wheel - 4" x 4-1/2" Plate Size - 450 lbs Capacity CasterHQ
In Stock · Same/Next Day
4" x 2" Thermo Rubber Polyolefin Wheel – 450 lb
Part # 30CS420PPR84X-03
from $31.00
Volume pricing available
Gray RubberPlate
Load rating
450 lbs
Size4" x 2"
Capacity450 lbs
MaterialGray Rubber
CorePolyolefin
More Details Less Details
Width 2"
Core Polyolefin
Temp Range -40°F to 180°F
Quick-fit wheel specs for replacement and procurement teams.
Shop Product
450 lbs
TieredPricing
4" x 2" Duratek High Tech Flat Tread Thermo Plastic Rubber Wheel - 4" x 4-1/2" Plate Size - 450 lbs Capacity CasterHQ
In Stock · Same/Next Day
4" x 2" Thermo Rubber Flat Tread Wheel – 450 lb
Part # 30CR420PPR23X-03
from $27.00
Volume pricing available
Gray RubberPlate
Load rating
450 lbs
Size4" x 2"
Capacity450 lbs
MaterialGray Rubber
CorePolyolefin
More Details Less Details
Width 2"
Core Polyolefin
Temp Range -40°F to 180°F
Quick-fit wheel specs for replacement and procurement teams.
Shop Product

4 inch solid polyurethane wheel casters 3-8 inch wheels by tread

Tread Core Wheel sizes Rated per caster Listed temperature Where it fits
Rubber Polyolefin 4 in 300 to 450 lb -40°F to 180°F cushioned and quiet on finished floors

Ratings are for single casters of 4 inch solid polyurethane wheel casters 3-8 inch wheels, from product fields [S1].

Choosing 4 inch solid polyurethane wheel casters 3-8 inch wheels

  1. Load: divide the loaded weight by three for a four-caster cart [S2]; at 450 lb each, 4 inch solid polyurethane wheel casters 3-8 inch wheels suit a loaded cart of about 1,350 lb.
  2. Mount: most 4 inch solid polyurethane wheel casters 3-8 inch wheels use a 4 x 4-1/2 in top plate; measure bolt hole centers on the old plate and compare.
  3. Floor: on 4 inch solid polyurethane wheel casters 3-8 inch wheels, rubber protects finished floors and runs quietly; check the rating if the cart also crosses rough concrete.
  4. Rig: swivel and rigid 4 inch solid polyurethane wheel casters 3-8 inch wheels are listed, with side lock brake options.

Related to 4 inch solid polyurethane wheel casters 3-8 inch wheels: caster wheels.

4 inch solid polyurethane wheel casters 3-8 inch wheels questions

How much weight can 4 inch solid polyurethane wheel casters 3-8 inch wheels carry?

Single 4 inch solid polyurethane wheel casters 3-8 inch wheels are rated 300 to 450 lb.

What top plate do 4 inch solid polyurethane wheel casters 3-8 inch wheels use?

Most 4 inch solid polyurethane wheel casters 3-8 inch wheels use 4 x 4-1/2 in.

What wheel material is most common on 4 inch solid polyurethane wheel casters 3-8 inch wheels?

Rubber leads on 4 inch solid polyurethane wheel casters 3-8 inch wheels, rated 300 to 450 lb per caster.

Are replacement wheels sold for 4 inch solid polyurethane wheel casters 3-8 inch wheels?

Yes. Wheel-only listings for 4 inch solid polyurethane wheel casters 3-8 inch wheels are here, sized 4 in; match the bore and hub length to your axle.

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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