The two sample caster numbers below illustrate Hamilton’s significant, easy-to understand numbering system. The numbering system for wheels alone, ordered separately, is even simpler.
Wheel only part numbers begin with a "W" Succeeding numbers and letter define the size, tread type, bearing, and options (if included.) For example, a W-620-DB-1/2 is a wheel 6" diameter X 2" face width, Duralast® type, with a 1/2" precision ball bearing. (If we choose to also keep the MORT, change part number to W-1235-R-1-1/4-BS (needs a dash so doesn’t look like "11-1/4")
Most Hamilton Wheels are made available with a choice of bearing sizes or types to provide broad interchangeability and to meet the wide variety of needs in the marketplace. Hence it is usually necessary when ordering wheels separately from casters to suffix the desired bearing size. But you will rarely need to measure the bearing size of a wheel used in a Hamilton caster, because the replacement wheel number is given to you in most of our caster charts
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