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Top plate dimensions are the length, width, and bolt-hole spacing of a plate mount caster's mounting plate — the measurements that determine whether it will physically bolt onto your equipment.
The catalog’s plate sizes range from 2-3/8″ x 2-3/8″ up to 8-1/2″ x 8-1/2″. Larger plates generally correspond to higher-capacity casters, since more bolts spread the load further.
Every plate-mount purchase — this is the single measurement most likely to cause a return if skipped.
Measuring the caster instead of the equipment. Always measure the existing mounting surface or bolt pattern on the equipment itself, not just an old caster that may already be a mismatch.
Browse our Plate Casters for real specs, capacities, and pricing.
What exactly should I measure?
Plate length, plate width, and the bolt-hole spacing (center to center) — all three need to match your equipment.
Do bigger plates always mean more capacity?
Generally yes, since a larger plate spreads mounting load over more bolts, but always check the actual capacity rating rather than assuming from plate size alone.
