Kingpinless casters — industrial swivel casters with the swivel raceway integrated into the top plate — no central kingpin. This eliminates the most common shock-load failure point on conventional swivel casters: kingpin loosening, shearing, or work-hardening under repeated impacts. Required for tow lines, high-cycle shock applications, military, aerospace ground support, and heavy industrial transport. Capacities to 15,600 lb per caster. Hamilton, Albion, Caster Concepts, and Faultless kingpinless series stocked. 554 SKUs.
Kingpinless eliminates the kingpin failure mode. Specify whenever shock loads, tow-line operation, or high cycle counts are part of the application.
| Spec | Kingpinless | Conventional Swivel |
|---|---|---|
| Swivel Raceway | Integrated into top plate | Bolt-through kingpin holds raceway |
| Shock Load Capacity | Full rated capacity (no kingpin to fail) | Reduces 30-50% under shock |
| Tow-Line Use | Approved at full rating | Not recommended above 2 mph |
| Failure Mode | Bearing wear (10+ year life) | Kingpin loosen / shear / work-harden |
| Maintenance | Lubrication only | Lubrication + kingpin torque check |
| Cost Premium | 15-30% over conventional | Lower initial cost |
| Capacity Range | 1,000 - 15,600 lb | 75 - 5,000 lb |
| Best For | Tow lines, shock loads, military, AGV | Indoor manual carts, low-cycle use |
Jump to the kingpinless family that matches your capacity and mount. Every series below uses the integrated-raceway construction described above.
Three triggers automatically require kingpinless: (1) tow-line operation (motorized cart pulling), (2) capacity above 2,500 lb per caster, (3) high cycle counts (>1,000 swivel events per day). Optional but recommended: outdoor use, threshold crossings, paved-to-unpaved transitions. For low-cycle indoor manual use, conventional swivel is fine and costs less.
CasterHQ stocks kingpinless casters in three capacity tiers: light-industrial (1,000-2,000 lb per caster), heavy-industrial (2,000-6,000 lb on 4-1/2″ x 6-1/4″ plate), and super-heavy (6,000-15,600 lb on 8-1/2″ x 8-1/2″ plate). Dual-wheel variants provide capacity in tight wheel-height envelopes. Match plate to existing cart mounting; match capacity to load with 30% safety margin.
Tow-line carts: 8″-12″ wheels for low rolling resistance at speed. Shock-load applications: 8″+ wheels to absorb thresholds and floor seams. AGV / robotic: 6-8″ for precise positioning. Outdoor and rough terrain: 10″-12″ pneumatic or solid rubber. Larger wheels reduce push-force and prolong bearing life.
Hamilton: highest capacities, best-known for aerospace ground support, mil-spec. Albion: USA-made, widest selection in 1,000-6,000 lb range, strong towline series. Caster Concepts: heavy industrial, custom-engineered, fastest lead time for non-stock sizes. Faultless: economy kingpinless, good for medium-duty industrial. CasterHQ stocks all four for cross-reference.
A swivel caster where the swivel raceway is integrated directly into the top plate — no central kingpin (bolt or rivet holding the raceway to the plate). Kingpinless construction eliminates the most common swivel caster failure mode: kingpin loosening, shearing, or work-hardening under repeated shock loads and high cycle counts.
Tow-line carts experience repeated impact loads when towed at speed, especially at floor seams, expansion joints, and direction changes. Conventional kingpin casters fail at the kingpin under these conditions — the kingpin work-hardens and shears off, dropping the cart. Kingpinless eliminates this failure mode by removing the kingpin entirely.
CasterHQ stocks kingpinless casters from 1,000 lb (light industrial) to 15,600 lb (Caster Concepts ZFMD super-heavy series). For 4-caster carts: 4,000 lb to 62,400 lb cart capacity. Above 15,600 lb per caster, applications typically use 6-caster or 8-caster configurations with kingpinless casters distributed for load balance.
Typically 15-30% more than equivalent-capacity conventional swivel. The cost premium is justified by: (1) elimination of kingpin replacement labor, (2) full-rating shock-load capacity (no derate), (3) longer service life (10+ years typical vs 3-5 for conventional under shock). For any application where kingpin failure would cause downtime, kingpinless pays back within 12-24 months.
Hamilton (full mil-spec line, up to 12,000 lb), Albion (towline KingHD series, 1,000-6,000 lb), Caster Concepts (ZFMD heavy industrial, up to 15,600 lb), Faultless (economy kingpinless for medium duty). CasterHQ is an authorized distributor for all four. Cross-reference between brands is supported — email info@casterhq.com with the existing part number.
Yes — kingpinless is fine indoors and lasts longer than conventional swivel. The only reason to choose conventional over kingpinless is initial cost. If the cart will see any shock loads (thresholds, expansion joints) or high cycle counts, the kingpinless premium pays back. For purely manual low-cycle indoor use under 1,500 lb, conventional is acceptable.
Single-wheel kingpinless: one large wheel (typically 8-12″) on a heavy-duty hub. Higher mount height. Dual-wheel kingpinless: two smaller wheels (typically 6-8″) on a shared hub. Lower mount height, same capacity. Specify dual-wheel when cart deck height is constrained (under truck bed, low overhead). Single-wheel for maximum bearing life and lowest rolling resistance.
Less maintenance than conventional: no kingpin to torque-check. Standard maintenance is quarterly lubrication of the swivel raceway (grease zerk on most industrial kingpinless casters). For outdoor or washdown environments, specify sealed-bearing option and re-lubricate every 6 months. Total kingpinless caster service life: 10+ years at rated load with standard maintenance.
