3-inch-wide kingpinless casters carry heavy, shock-loaded equipment on a 4-1/2" x 6-1/4" top plate with no central kingpin to loosen or shear. The wide 3" tread spreads the load over more wheel contact, and a sealed swivel raceway replaces the failure point that wears out conventional casters. This range covers 6", 8", 10", and 12" wheels in gray iron, ductile iron, phenolic, and super-poly-on-iron, rated 2,000 to 6,000 lb per caster in both swivel and rigid.
Conventional casters fail at the kingpin under impact and repeated shock load. Kingpinless rigs remove it. a sealed, hardened swivel raceway carries the load instead. Paired with a 3" wide tread, that is the configuration for towlines, die carts, and powered equipment that pound a caster. Capacities in this range follow ANSI/ICWM endurance testing: a static test at four times the rated load, plus a 10,000-rotation dynamic test.
Larger wheels roll over floor cracks and debris with less push force and raise capacity. 6" and 8" suit lower deck heights; 10" and 12" clear rougher floors and reach the top of the capacity range. All four diameters share the same 3" tread width and 4-1/2" x 6-1/4" plate.
Gray iron is the economical hard-floor choice. Red ductile iron carries the highest loads in this group, up to 6,000 lb. Phenolic handles high heat and oven or wash lines. Super-poly-on-iron rolls quieter and protects finished floors while still reaching 6,000 lb. Wheel hardness is specified by durometer per ASTM D2240.
Every caster here mounts on the 4-1/2" x 6-1/4" plate, so swivel and rigid units bolt to the same pattern and interchange on one piece of equipment. The standard layout is two rigid and two swivel for carts that need to track straight, or four swivel for tight, omnidirectional maneuvering.
Not sure which spec fits your equipment? Contact CasterHQ. give us the load, floor, and deck height.
CasterHQ stocks 32 kingpinless configurations on the 4-1/2" x 6-1/4" plate at our Mansfield, TX facility. an even 16 swivel and 16 rigid across gray iron, ductile iron, phenolic, and super-poly wheels. Most ship the same or next business day. We spec these into OEM and MRO equipment every week, so the material and swivel-to-rigid mix reflects what actually holds up in the field, not a catalog dump.
It is the wheel tread width, a 3" face. A wider tread spreads the load over more contact area, lowers floor pressure, and adds stability under heavy or shock loads compared with a narrower 2" tread.
2,000 to 6,000 lb per caster in this range, depending on wheel diameter and material. Red ductile iron and super-poly-on-iron reach the 6,000 lb top end.
All of these use a 4-1/2" x 6-1/4" top plate, so swivel and rigid units bolt to the same pattern and interchange on one piece of equipment.
Yes. The kingpin is the part that loosens and shears under impact. Removing it, plus the wide 3" tread, makes these a standard pick for towlines, die carts, and powered equipment. See our shock load caster guide.
Two rigid plus two swivel tracks straight on long runs; four swivel maneuvers in tight spaces. You can mix freely because they share the 4-1/2" x 6-1/4" plate.
Most ship the same or next business day from Mansfield, TX. Call 844-439-4335 for current stock and lead times.
Standards & references: Load ratings per the ANSI/ICWM caster performance standard (Institute of Caster and Wheel Manufacturers). Wheel hardness per ASTM D2240 durometer.
