Caster Terminology


Distance between the center of the kingpin and the center of the axle. Longer offsets swivel easier,  shorter offsets increase strength.


Overall Height:

The vertical distance from the top of the fastener (that equipment rests on) to the bottom of the wheel.

Overall Height

Caster Size:

Caster size refers to wheel diameter.
(If the wheel is 6" in diameter, it is considered a 6" caster).

Caster Size

Durable Superior Casters® Product Warranty

Limited Warranty Policy:

Durable Superior Casters® number one pledge is quality. Our comprehensive engineering test lab performs product tests to meet the standards of the Institute of Caster and Wheel Manufacturers (ICWM), the National Sanitation Foundation (NSF), Restriction of Hazardous Substance (RoHS) and the special requirements of virtually all manufacturers.

Durable Superior Casters® products are warranted against defects in material and workmanship for different periods of time from the date of purchase. This warranty does not cover damages caused by misapplication, misuse, abuse, modification, improper installation, or lack of regular lubrication maintenance. Any product that is claimed to be defective and is returned to any one of Durable Superior Casters® warehouses with prior approval will be repaired or replaced free of charge (excluding freight and installation).

This warranty is exclusive and there are no other warranties, express or implied, such as an implied warranty of merchantability or fitness for particular purpose. This remedy is the sole remedy in contract, tort or otherwise, and Durable Superior is not liable for incidental, consequential or special damages.

Three-Year Warranty:

We offer a three year limited warranty on complete casters only; assembled and shipped by us in the following series: 45/46, 47/48, 49/50, 57/58, 61/62, 63/64, 65/66, D1/R1, D2/R2, D3/R3, and D4/R4 with Forged Steel, Ductile, Ultra-Poly, ErgoLastomer, Solid Steel, Solid Steel V-Groove, Champion and PolyFlexon wheels, equipped with either precision ball bearings or tapered bearings. Warranty does not apply on any hybrid casters using a combination of Durable Superior Casters parts with any other manufacturer's parts.

General Warranty:

All Durable Superior Casters® products not mentioned above are covered with a one-year limited warranty from the date of purchase.

All data is based on ASTM Standard 23°C or 77.5°F



Swivel Radius:

Distance between the center of the kingpin and the trailing edge of the wheel.

Tread Width (Face):

Width of the wheel tread, measured from the side of the wheel core rather than the point of floor contact.

Generic caster

Swivel Radius

Tread Width (Face)


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In a relentless pursuit of innovation in new product development, our engineering department has built a sizable library of 3D models and 2D drawings for our customer’s use. Please contact our sales staff at

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Generic caster
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Generic caster
Generic caster