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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

Caster Wheel Materials & Selection Guide
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Stevens ESCORT SRT-8 steel appliance hand truck, red steel frame, black uprights, strap and footplate

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Zinc Plated Axles

Diameter: 5/16 to 3/4 inLength: 2-1/4 to 4-3/4 inZinc plated
Zinc plated caster axles, each with its nut. Most are zerk axles with a grease fitting to lube the wheel bearing; the 1/2 x 4 in is a plain axle. The 5/16 x 2-1/4 in axle with lock nut fits shopping cart wheels.
TieredPricing
(1) Piece - 1/2" x 3-3/8" Zerk Axle & Nut CasterHQ
In Stock · Same/Next Day
1/2" x 3-3/8" Zerk Axle & Nut Zinc Plated Caster Hardware
Part # AZ50-338
$4.00
Volume pricing available
Plate
Size1/2" x 3-3/8"
Capacity—
Wheel—
MountPlate
Type—
More Details Less Details
Width 3-3/8"
Frame Zinc Plated Steel
(1) Piece - 1/2" x 3-3/8" Zerk Axle & NutCasterHQ listing is for (1)...
Shop Product
TieredPricing
5/16 Inch x 2-1/4 Inch Shopping Cart Axle & Lock Nut - Universal Fit | Fits Most Standard Carts CasterHQ
In Stock · Same/Next Day
5/16" x 2-1/4" Shopping Cart Axle & Lock Nut Fits Standard Carts
Part # AXNSC
$3.00
Volume pricing available
Size5/16" x 2-1/4"
Capacity—
Wheel—
Mount—
Type—
More Details Less Details
Width 2-1/4"
Universal Shopping Cart Wheel Axle & Lock Nut – Fits Most Carts This 5/16"...
Shop Product
TieredPricing
(1) Piece - 3/8" x 2-1/4" Axle & Nut CasterHQ
In Stock · Same/Next Day
3/8" x 2-1/4" Zinc Plated Axle & Nut Replacement Part
Part # AZ38-225
$3.00
Volume pricing available
Plate
Size3/8" x 2-1/4"
Capacity—
Wheel—
MountPlate
Type—
More Details Less Details
Width 2-1/4"
Frame Zinc Plated Steel
CasterHQ listing is for (1) one axle and nut. DIMENSIONS:AXLE DIAMETER: 3/8"AXLE LENGTH: 2-1/4"MATERIAL:...
Shop Product
TieredPricing
(1) Piece - 3/4" x 4-3/4" Zerk Axle & Nut CasterHQ
In Stock · Same/Next Day
3/4" x 4-3/4" Zerk Axle & Nut Zinc Plated Caster Hardware
Part # AZ75-475
$11.00
Volume pricing available
Plate
Size3/4" x 4-3/4"
Capacity—
Wheel—
MountPlate
Type—
More Details Less Details
Width 4-3/4"
Frame Zinc Plated Steel
CasterHQ listing is for (1) one zerk axle and nut. DIMENSIONS:AXLE DIAMETER: 3/4"AXLE LENGTH:...
Shop Product
TieredPricing
(1) Piece - 1/2" x 2-7/8" Zerk Axle & Nut CasterHQ
In Stock · Same/Next Day
1/2" x 2-7/8" Zerk Axle & Nut Zinc Plated Caster Hardware
Part # AZ50-288
$4.00
Volume pricing available
Plate
Size1/2" x 2-7/8"
Capacity—
Wheel—
MountPlate
Type—
More Details Less Details
Width 2-7/8"
Frame Zinc Plated Steel
CasterHQ listing is for (1) one zerk axle and nut. DIMENSIONS:AXLE DIAMETER: 1/2"AXLE LENGTH:...
Shop Product
TieredPricing
(1) Piece - 1/2" x 3" Zerk Axle & Nut CasterHQ
In Stock · Same/Next Day
1/2" x 3" Zerk Axle & Nut Zinc Plated Replacement Part
Part # AZ50-300
$4.00
Volume pricing available
Plate
Size1/2" x 3"
Capacity—
Wheel—
MountPlate
Type—
More Details Less Details
Width 3"
Frame Zinc Plated Steel
CasterHQ listing is for (1) one zerk axle and nut. DIMENSIONS:AXLE DIAMETER: 1/2"AXLE LENGTH:...
Shop Product
TieredPricing
(1) Piece - 3/4" x 4-1/4" Zerk Axle & Nut CasterHQ
In Stock · Same/Next Day
3/4" x 4-1/4" Zerk Axle & Nut Zinc Plated Caster Hardware
Part # AZ75-425
$10.00
Volume pricing available
Plate
Size3/4" x 4-1/4"
Capacity—
Wheel—
MountPlate
Type—
More Details Less Details
Width 4-1/4"
Frame Zinc Plated Steel
(1) Piece - 3/4" x 4-1/4" Zerk Axle & NutCasterHQ listing is for (1)...
Shop Product
TieredPricing
(1) Piece - 1/2" x 4" Plain Axle & Nut CasterHQ
In Stock · Same/Next Day
1/2" x 4" Plain Axle & Nut Zinc Plated Wheel Hardware
Part # AP50-400
$10.00
Volume pricing available
Plate
Size1/2" x 4"
Capacity—
Material—
Core—
More Details Less Details
Width 4"
Quick-fit wheel specs for replacement and procurement teams.
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Axles by size

Axle Type
5/16 x 2-1/4 in Shopping cart axle, lock nut
3/8 x 2-1/4 in Axle and nut
1/2 x 2-7/8 in Zerk axle and nut
1/2 x 3 in Zerk axle and nut
1/2 x 3-3/8 in Zerk axle and nut
1/2 x 4 in Plain axle and nut
3/4 x 4-1/4 in Zerk axle and nut
3/4 x 4-3/4 in Zerk axle and nut

From product titles and listings [S1].

Before you order

  1. Diameter: match the wheel bore or bearing ID.
  2. Length: measure across the outside of the fork legs and add room for the nut.
  3. Grease: pick a zerk axle if the wheel has bearings that need greasing.

Related: axles and nuts, sealed bearings and combo washers.

Caster axle questions

What is a zerk axle?

An axle with a grease fitting so the wheel bearing can be greased without taking the wheel off.

Which axle fits a shopping cart wheel?

The 5/16 x 2-1/4 in axle with lock nut.

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.

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