Industrial Casters. Engineered for Spec.
Carts longer than 60" or wider than 36" deflect under load. Adding 2 center rigid casters in diamond pattern eliminates deflection and distributes load 30-40% better than corner-only.
Towed carts use rigid rear for tracking, swivel front for steering. Reverse this and the cart jackknifes. Confined aisles need all-swivel. Rail/track uses all-rigid.
Load center of gravity above 48" creates tip-over risk on swivel turns. Specify wider track, outrigger casters, or total-lock brakes for parked stability. Rule of thumb: track width ≥ 1.5x CG height.
Side-offset loads concentrate 75%+ on two casters. Bump from 4 to 6 casters with diamond pattern. Point loads (single CG) require sizing the bearing caster at 1.5x normal capacity.
4-caster carts: brakes on diagonal corners. All-swivel carts need total-lock brakes (locking both wheel and swivel) — single-action brakes let the cart pivot around the locked corner.
Above 1,500 lbs/caster, kingpin construction fails under cyclic load within 6-12 months. Kingpinless construction (Albion 110AX, 28-series) handles 40% more cyclic load and lasts 3-5x longer.
MAX Efficiency swivel for corner positions. Maintenance-free precision bearings + kingpinless. 1,500 lb capacity. Best ergonomic-to-capacity ratio.
Shop 28AN08228SL →MAX Efficiency rigid for center position in diamond pattern. 1,500 lb capacity. Carries the primary load while corner swivels steer.
Shop 28AN08228R →MAX Efficiency with brake. 6"x2", 1,250 lb. Perfect for diagonal brake positions on 4-caster carts or all-positions on critical-stability applications.
Shop 28AX06228SFBK →Long trailers, multi-axle die carts, AGV-coupled platforms, asymmetric loads — these benefit from layout review. Send your cart drawing, we return verified caster spec with placement coordinates and deflection analysis.
Carts longer than 60" deflect under load when supported only at corners. The center sags, putting more load on corner casters and creating rocking. Center rigid casters in diamond pattern carry primary load directly under center of mass while corner swivels handle steering. Eliminates deflection and distributes load 30-40% better than 4-corner.
High CG creates tip-over risk on swivel turns and inertial loading during stops. Rule of thumb: track width (caster-to-caster spacing) should be at least 1.5x the CG height. CG above 48" requires wider track or outrigger casters. CG above 72" requires total-lock brakes mandatory plus stability calculation.
Yes when towing direction is fixed. Swivel front + rigid rear gives directional stability — rigid rear tracks like a trailer, swivel front follows the tow point. Reverse this and the cart will jackknife on any bump or steering input.
For 8 or more casters, use N-2 (assume two lift offs). Long carts have more deflection points and longer traverse times across uneven floors. Battery transfer carts, multi-axle die handlers, and aerospace GSE typically run 8-12 casters and always use N-2.
Offset loads (25%+ shifted from geometric center) concentrate load on fewer casters. Side-offset on 4-caster cart loads two casters at 75% total — recommend bumping to 6 with diamond. Point loads (single CG) require sizing the bearing caster at 1.5x normal capacity. For severely asymmetric layouts, custom placement is needed — submit drawing to engineering.
For 4-caster carts: brakes on diagonal corners (front-right + rear-left). Diagonal placement prevents single-axis pivot when one brake engages. For 4-swivel carts: total-lock brakes (locking both wheel and swivel) are mandatory — single-action brakes let the cart pivot around the locked corner.
Standard rule: caster centerline 1.5-2 inches from cart edge. Closer than 1.5" and the swivel sweep extends past the edge, creating snag hazards. Farther than 2" and load distribution shifts inward, increasing deck stress. For diamond patterns, center casters sit at 50% length, equidistant between corners.
Heavier loads on 4-swivel carts require more breakout force to initiate a turn. Above 1,500 lbs total, all-swivel layouts feel sluggish without precision raceway swivels. Kingpinless designs reduce this dramatically. See kingpinless vs kingpin.
Escalate for: carts over 96" length, multi-axle/articulated trailers, AGV-coupled platforms, asymmetric loads (load center off geometric center), or any layout where deflection between casters could exceed 0.25". Submit your cart drawing and engineering returns a placement spec.
