Precision Tapered Roller Bearings.
These bearings are ideal for heavy duty and power-towed caster applications because their tapered faces will handle any assortment of downward and side force.
Double bearings are installed in each wheel, one in each side of the hub, consisting of a cup (hardened and ground outer raceway) and cone (roller assembly). Spanner bushings are not employed since adjustment requires tightening caster legs against the bearing assembly. Tapered bearings extend overall hub length of the wheel itself by approximately 1/4″. (Shown above with optional integral seal.)
Precision Ball Bearings.
These Precision Ball Bearings work best when roll ability is important and side thrust is not a critical factor. (Tapered bearings are best suited where side thrust is critical.) The bearings are pre-lubricated and sealed at the factory so greasing is not required, reducing maintenance costs… Double-sealed precision ball bearings (shown on left) incorporate steel reinforced rubber seals securely fastened to a groove on the ring of both sides of the bearings. They now replace straight roller bearings in the majority of our casters using polyurethane tread and solid urethane wheels and can be provided optionally on many other wheel types. Shielded stainless steel precision ball bearings are used in our stainless steel and solid urethane wheels to prevent rusting and improve roll ability. On special order we can supply additional sizes and configurations including flanged, sealed square bores, extended inner raceways, and wide inner raceways with self-locking collars.
Straight Roller Bearings.
These are most popular anti-friction bearing for industrial equipment. Consists of a cage-type roller assembly, and an outer race that may be separate or integral. (Note: plastic retaining washers or other components may be used unless we are advised of a high-heat application.)
Oilless Sleeve Bearings.
A sleeve, usually of sintered iron or oil-impregnated bronze, is press-fit into the wheel bore. Lacks the ease of movement anti-friction bearings provide, but practical for light loads or where re-lubrication is a problem. (A light application of oil or graphite improves rollability and extends bearing life.)
For environments detrimental to metal bearings, acetyl resin bearings offer chemical and corrosion resistance. Delrin® (registered DuPont trademark) is a standard offering in certain wheels, as either a sleeve or flange type bearing. Note: flange type bearings extend actual hub length of wheel approximately 3/16″.
Non-Precision Ball Bearings.
The standard ball bearings referred to are the unground radial type, intended for light-to-medium duty use.
The term applied to running machine-bored wheels directly on an axle; hence, the absence of a bearing. Suitable for light or seldom moved loads, where ease of starting and rolling is not too important or where price is a dominant factor.
For most applications, the bearings discussed above work quite effectively. However, there is an occasional requirement for bearings with special features and characteristic.
For additional information visit our website: Material Flow or call us at 800-338-1382