Kingpinless Casters

A Kingpinless raceway is constructed of a top plate with inner raceway and an outer raceway to which legs are welded for the wheel. The outer raceway is mated to the inner raceway using a series of ball bearings installed through a loading hole. This load hole is then sealed and the caster is permanently fixed together. The Kingpinless design eliminates the leading cause of caster failure for a far more robust product capable of handling heavier loads, more abusive applications and higher towing speeds.The 47, 65, 70, 75, 76, 85, 95 and 125 Series Casters are RWM Kingpinless™ Casters. We patented this design and it has proven itself to be the best solution for demanding applications, with a capacity of 350-40,000 lbs. This is the caster design that all others are now copying because it is simply unmatched in extending service life, reducing all possible causes for caster failure.



RWM Casters patented KingpinlessTM caster design is superior due to the offset precision-machined raceway that exerts radial force evenly where there is full contact between the ball bearing and the raceway. The result is that there are no direct “hammering” forces on the intersections of the raceways, vastly reduced raceway wear, elimination of the “pull apart” forces of stress in the swivel section, and smoother swiveling action. There is also high maneuverability, longer service life, less maintenance, extra impact resistance and high radial force absorption. Our unique Kingpinless™ caster design adds more mass at key points. This, plus more thorough heat treatment, provides additional strength and combats brinelling into the core material.


Kingpinless FlyerThe inline positioning of the majority of our competitor’s raceways creates a direct “hammering” effect via the ball bearings, which are centered on the tangent of the two raceways, thus savaging and eventually eroding the raceway. The inevitable result is a loose fit and progressive swivel failure. Even a double raceway configuration is subject to these same “hammering” hazards. The machining requirements of the competition to accommodate a swivel lock reduces strength, leading to premature fatigue, stress fractures of the raceway and eventual failure. RWM Kingpinless™ castersfunction flawlessly, even at high speeds, without shimmy. Our swivel section tolerances are .017, compared with .030 for the competition. This differential represents the amount of play between the top plate and the swivel yoke. The more precise the machining is, the closer the tolerance; the closer the tolerances, the longer the service life.


Our Kingpinless™ casters raceway provides the additional mass necessary for a double weld on its legs, inside and outside, as opposed to the competition’s single weld. Their machining process does not provide the necessary mass for a weld on the outside race. Tests prove that RWM caster legs have a 74% higher yield strength than the competition, and a 74% higher ultimate strength than the competition. RWM caster carbon content, the essential ingredient for strength in steel, is nearly seven times higher than the competition. The steel in an RWM caster raceway is superior in its heat treatment – nearly 18% harder than the competition. As a result, the RWM caster welded-in race is nearly 20% better equipped to resist brinelling that the competition, and allows the swivel section to turn easily in the roughest applications.

For ultimate dependability, choose RWM Kingpinless™ Casters, and if our standard product line doesn’t meet your specifications, give us a call. Custom design and production of custom industrial casters for application specific standards is our specialty!

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