plummer block

English

Alternative forms

plumber block

Etymology

From an unknown word, possibly the surname Plummer a1796, + block

Noun

plummer block (plural plummer blocks)

  1. A mounting used to support a rotating shaft, using a bearing in a two-piece housing which is bolted to a foundation or bedplate with the mounted shaft in a parallel plane to the mounting surface and perpendicular to the centre line of the mounting holes; functionally similar to a pillow block.

Usage notes

A plummer block usually refers to a heavy- or very-heavy-duty housing, always in two pieces. The lower piece is bolted to the base plate or foundation, then the bearing and shaft are rested on it, and the cap is bolted down to the lower piece. A pillow block usually refers to a light duty housing, frequently in one piece and often with an integral anti-friction bearing.

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