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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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18MM Bore

Diameter: 4 to 8 inTread: 1-1/2, 2 and 3 inCapacity: 450 to 1,500 lb per wheel
18 mm bore keyed wheels in polyurethane. Polyurethane on steel cores is the most common tread here, rated 450 to 1,500 lb per wheel in 4, 5, 6 and 8 in.
600 lbs
TieredPricing
5" x 1-1/2" Polyurethane on Steel Keyed Drive Wheel | 18mm Bore - 600 lbs Capacity Per Wheel CasterHQ
Made to Order · 4-6 Weeks
5" x 1.5" Polyurethane Keyed Industrial Replacement Wheel – 600 lb · 18mm Bore
Part # HD-515-PS-KDW-18mm
$166.00
Volume pricing available
Polyurethane
Load rating
600 lbs
Size5" x 1-1/2"
Capacity600 lbs
MaterialPolyurethane
CoreSteel
More Details Less Details
Width 1-1/2"
Core Steel
Quick-fit wheel specs for replacement and procurement teams.
Shop Product
450 lbs
TieredPricing
4" x 1-1/2" Polyurethane on Steel Keyed Drive Wheel | 18mm Bore - 450 lbs Capacity Per Wheel CasterHQ
Made to Order · 4-6 Weeks
4" x 1-1/2" Polyurethane Keyed Industrial Wheel – 450 lb
Part # HD-415-PS-KDW-18mm
$133.00
Volume pricing available
Polyurethane
Load rating
450 lbs
Size4" x 1-1/2"
Capacity450 lbs
MaterialPolyurethane
CoreSteel
More Details Less Details
Width 1-1/2"
Core Steel
Quick-fit wheel specs for replacement and procurement teams.
Shop Product
1000 lbs
TieredPricing
8" x 2" Polyurethane on Steel Keyed Drive Wheel | 18mm Bore - 1,000 lbs Capacity Per Wheel CasterHQ
Made to Order · 4-6 Weeks
8" x 2" Polyurethane Keyed Industrial Replacement Wheel – 1,000 lb · 18mm Bore
Part # HD-82-PS-KDW-18mm
from $314.00
Volume pricing available
Polyurethane
Load rating
1000 lbs
Size8" x 2"
Capacity1000 lbs
MaterialPolyurethane
CoreSteel
More Details Less Details
Width 2"
Core Steel
Quick-fit wheel specs for replacement and procurement teams.
Shop Product
1500 lbs
TieredPricing
6" x 3" Polyurethane on Steel Keyed Drive Wheel | 18mm Bore - 1,500 lbs Capacity Per Wheel CasterHQ
Made to Order · 4-6 Weeks
6" x 3" Polyurethane Keyed Industrial Replacement Wheel – 1,500 lb · 18mm Bore
Part # HD-63-PS-KDW-18MM
$282.00
Volume pricing available
Polyurethane
Load rating
1500 lbs
Size6" x 3"
Capacity1500 lbs
MaterialPolyurethane
CoreSteel
More Details Less Details
Width 3"
Core Steel
Quick-fit wheel specs for replacement and procurement teams.
Shop Product
900 lbs
TieredPricing
6" x 2" Polyurethane on Steel Keyed Drive Wheel | 18mm Bore - 900 lbs Capacity Per Wheel CasterHQ
Made to Order · 4-6 Weeks
6" x 2" Polyurethane Keyed Industrial Replacement Wheel – 900 lb · 18mm Bore
Part # HD-62-PS-KDW-18mm
from $216.00
Volume pricing available
Polyurethane
Load rating
900 lbs
Size6" x 2"
Capacity900 lbs
MaterialPolyurethane
CoreSteel
More Details Less Details
Width 2"
Core Steel
Quick-fit wheel specs for replacement and procurement teams.
Shop Product
600 lbs
TieredPricing
6" x 1-1/2" Polyurethane on Steel Keyed Drive Wheel | 18mm Bore - 600 lbs Capacity Per Wheel CasterHQ
Made to Order · 4-6 Weeks
6" x 1.5" Polyurethane Keyed Industrial Replacement Wheel – 600 lb · 18mm Bore
Part # HD-615-PS-KDW-18mm
$191.00
Volume pricing available
Polyurethane
Load rating
600 lbs
Size6" x 1-1/2"
Capacity600 lbs
MaterialPolyurethane
CoreSteel
More Details Less Details
Width 1-1/2"
Core Steel
Quick-fit wheel specs for replacement and procurement teams.
Shop Product
800 lbs
TieredPricing
5" x 2" Polyurethane on Steel Keyed Drive Wheel | 18mm Bore - 800 lbs Capacity Per Wheel CasterHQ
Made to Order · 4-6 Weeks
5" x 2" Polyurethane Industrial Replacement Wheel – 800 lb
Part # HD-52-PS-KDW-18mm
from $183.00
Volume pricing available
Polyurethane
Load rating
800 lbs
Size5" x 2"
Capacity800 lbs
MaterialPolyurethane
CoreSteel
More Details Less Details
Width 2"
Core Steel
Quick-fit wheel specs for replacement and procurement teams.
Shop Product
600 lbs
TieredPricing
4" x 2" Polyurethane on Steel Keyed Drive Wheel | 18mm Bore - 600 lbs Capacity Per Wheel CasterHQ
Made to Order · 4-6 Weeks
4" x 2" Polyurethane Keyed Industrial Wheel – 600 lb
Part # HD-42-PS-KDW-18mm
$133.00
Volume pricing available
Polyurethane
Load rating
600 lbs
Size4" x 1-1/2"
Capacity600 lbs
MaterialPolyurethane
CoreSteel
More Details Less Details
Width 1-1/2"
Core Steel
Quick-fit wheel specs for replacement and procurement teams.
Shop Product

18 mm bore keyed wheels by tread

Tread Core Wheel sizes Rated per wheel Listed temperature Where it fits
Polyurethane Steel 4, 5, 6 and 8 in 450 to 1,500 lb quiet, floor-friendly and long wearing

Ratings are for single wheels of 18 mm bore keyed wheels, from product fields [S1].

Wheel sizes

Wheel Treads Rated
4 x 1-1/2 in polyurethane 450 to 600 lb
5 x 1-1/2 in polyurethane 600 lb
5 x 2 in polyurethane 800 lb
6 x 1-1/2 in polyurethane 600 lb
6 x 2 in polyurethane 900 lb
6 x 3 in polyurethane 1,500 lb
8 x 2 in polyurethane 1,000 lb

Choosing 18 mm bore keyed wheels

  1. Load: divide the loaded weight by three for a four-wheel cart [S2]. A 1,000 lb wheel from this page then suits about 3,000 lb, and the strongest at 1,500 lb about 4,500 lb.
  2. Floor: on 18 mm bore keyed wheels, polyurethane protects finished floors and runs quietly; check the rating if the cart also crosses rough concrete.

18 mm bore keyed wheels questions

How much weight can 18 mm bore keyed wheels carry?

Single 18 mm bore keyed wheels are rated 450 to 1,500 lb; most fall between 600 and 1,000 lb.

What wheel material is most common on 18 mm bore keyed wheels?

Polyurethane leads on 18 mm bore keyed wheels, rated 450 to 1,500 lb per wheel.

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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