packing nut

Noun
  1. A nut used to tighten a stuffing box (synset 104352865)
    is a type of: nut - a small (usually square or hexagonal) metal block with internal screw thread to be fitted onto a bolt
    is a part of: packing box, stuffing box - a small chamber in which packing is compressed around a reciprocating shaft or piston to form a seal
    same as: stuffing nut

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