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Caster Plate Mounting Hardware

Thread: 5/16-18, 3/8-16, 1/2-13Packs: 16 or 64 piecesFinish: zinc
Hardware kits to fasten top-plate casters to a cart, dolly, tool box or rack. Each kit has carriage bolts, hex thread-cutting screws, SAE flat washers and nylon-insert lock nuts, in 5/16-18, 3/8-16 or 1/2-13, as a 16-piece pack for one caster or a 64-piece set for four. Pick the size that fits the bolt holes in the caster plate and the frame. This page has hardware kits only, not weld-on brackets or adapter plates.

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2 types

Wheel = wheel diameter · capacity is per caster.

Caster Plate Mounting Hardware: buying guide

Caster plate mounting kits with carriage bolts, thread-cutting screws, flat washers and lock nuts in 5/16-18, 3/8-16 and 1/2-13: 16 pieces for one caster or 64 for four.

5/16, 3/8, 1/2 in16 or 64 piecesZinc-finish steelBolts and lock nuts

Shop Plate Mounting Hardware

The kits

Size 16-piece pack (1 caster) 64-piece set (4 casters)
5/16-18 4 each of carriage bolts, thread-cutting screws, washers, lock nuts 16 of each
3/8-16 4 of each 16 of each
1/2-13 4 of each 16 of each

Product descriptions [S1]. Zinc-finish steel.

Which size

Measure the bolt holes in the caster's top plate and in the frame, and use the largest of the three sizes that passes through both with a little clearance. All four holes on one plate take the same size.

Bolts or screws

  • Carriage bolts with lock nuts: go through the frame or deck. The square neck locks into wood so the bolt does not spin.
  • Hex thread-cutting screws: cut their own threads in a pilot hole in metal, for frames you cannot reach behind.
  • Use a flat washer under the nut and tighten evenly so the plate sits flat.

Caster mounting hardware questions

What is in a kit?

Carriage bolts, hex thread-cutting screws, SAE flat washers and nylon-insert lock nuts. The 16-piece pack does one caster and the 64-piece set does four.

What sizes are available?

5/16-18, 3/8-16 and 1/2-13.

Which size fits my caster?

The largest bolt that fits the holes in the top plate. Measure the holes.

Do you sell weld-on plates here?

No. This page has bolt kits only.

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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