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CasterHQ Engineering Tools · Replacement

Caster Bolt Pattern & Mounting Plate Identifier

Measure the old plate, match the new caster. Enter your top-plate dimensions and bolt-hole spacing and this tool finds the closest standard plate size and the matching CasterHQ caster line, so a replacement drops straight in.

The short answer

A caster top plate is identified by two measurements: the overall plate length and width, and the bolt-hole spacing (center to center) in each direction. Match both to a standard size and any caster on that plate will bolt into the existing holes. The most common industrial plates are 2-3/8 by 3-5/8 for light and medium duty and 4 by 4-1/2 for heavy duty.

Measure Your Plate

Plate dimensions are required; bolt spacing sharpens the match. All in inches.

Closest standard match
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Standard top-plate sizes

Plate (L x W) Typical bolt spacing Duty
How matching works

The tool compares your plate length and width to the standard sizes and reports the nearest one and how close it is. Bolt-hole spacing confirms the match, because two plates can share an outline but use different hole patterns. A high-confidence match means a stocked caster will bolt straight into your existing holes; a low-confidence match means send us the measurements to verify before ordering.

Not a clean match? Send us the measurements.

Copy the spec above into a quote and we will identify the caster and confirm a drop-in replacement, or recommend an adapter plate.

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Found this useful?

Send it to someone who needs it.

Know an engineer spec'ing casters or a buyer fighting cart push force? Pass this tool along. Ten seconds, and it might save them an afternoon and a bad purchase.

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Cite this tool

CasterHQ. Caster Engineering Tool. casterhq.com

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Reviewed by Bob Camp, Director of Caster Sales, 45+ years in the caster industry. Updated June 14, 2026.

Match is based on standard North American industrial plate sizes; bolt patterns vary by manufacturer and series. Confirm hole spacing before ordering, or send the measurements for verification. CasterHQ, Mansfield, TX · 844-439-4335.

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