When does 10″ x 4″ replace 10″ x 3″?
Capacity primarily. The 10″ x 3″ tops at 7,000 lb dual-wheel; 10″ x 4″ reaches 18,000 lb single-wheel kingpinless. For applications above 7,000 lb per caster — aircraft tugs, military transport, foundry charging carts, large fleet transport — 10″ x 4″ is the spec. Also: the 4″ tread distributes load across a wider contact patch, reducing wheel deflection at the same capacity.
What plate dimensions for 10″ x 4″?
Almost exclusively the 4-1/2″ x 6-1/4″ heavy industrial plate or larger 6-1/8″ x 7-1/2″ super-heavy plate. The standard 4″ x 4-1/2″ medium plate isn’t structurally sufficient for the loads these casters carry — the bolt-through stress would exceed plate yield strength under continuous duty.
Kingpinless at 18,000 lb — what makes it possible?
The forged steel construction itself. At 10″ x 4″ size with forged-steel wheel core and integrated kingpinless raceway, the entire caster is essentially one continuous structural piece — no kingpin failure mode because there’s no kingpin. Hamilton publishes 18,000 lb as the rated static capacity at 3 mph rolling speed for the kingpinless variant. Caster Concepts manufactures comparable kingpinless variants in this size class as well.
How does the Maxi-Duty wheel differ from the EPSD wheel?
Maxi-Duty is Hamilton’s polyurethane-on-forged-steel wheel-only product line — sized for replacement of worn wheels on existing forged-steel yoke assemblies. EPSD is the complete caster assembly (yoke + wheel + bearings + top plate) sold as a finished unit. If your existing equipment has a Hamilton forged steel yoke but a worn poly tread, Maxi-Duty W-1040-DL is the direct replacement.
How does this ship?
10″ x 4″ casters ship LTL freight in nearly all cases due to weight — a single forged-steel kingpinless caster at this size weighs 75-100+ lb. Stock items at Mansfield, TX ship within 1 business day. Specialty configurations may have 5-7 day lead time. Freight quote at order placement.
Hamilton EPSD/Maxi-Duty AuthorizedFull Hamilton heavy industrial 10″ x 4″ line stocked with manufacturer warranty.
18,000 lb KingpinlessHeaviest standard industrial 10″ x 4″ configuration available.
Cross-Reference SupportCaster Concepts, Albion, and competitor heavy industrial matched to Hamilton equivalent at info@casterhq.com.
