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Guide

How to Read a Bearing Housing Model Number

Names like UCP208 or F207 look cryptic until you know the pattern. Once you can read them, comparing quotes across suppliers becomes much easier.

Part 1 — the housing series

The leading letters describe the housing type and shape: UCP (pillow block), UCF (square flange), UCFL (oval flange), and the P / F / FL / FC / T family for split and other housing styles. Different manufacturers share this letter system for interchangeability, which is why a UCP housing from one factory can often replace another.

Part 2 — the shaft size digits

The number group normally encodes the bore size. In the common metric system, the last two digits of a two-digit code (for example, the 08 in 208) refer to a standard shaft diameter in millimetres following the ISO size series. Larger two-digit groups follow the same logic: the digits describe a standard diameter step, not the millimetres written directly.

Part 3 — the bearing type inside

The first digit or letter block before the size digits tells you the bearing type inside the housing — for example, UC for the wide-inner-ring ball bearing used in most pillow blocks. When you ask for a matched set, the housing and bearing must share this code system, otherwise the set will not assemble correctly.

Why matched sets save time

Buying housings and bearings from different sources is where mistakes happen: a housing meant for one series assembled with a bearing from another. When the supplier ships housing and bearing as one matched set, that failure mode disappears before it starts.

Tell us the model number on your current housing — we will confirm the series and offer the matched set.