Wrench - Size Designations

Size Designations

Size is usually determined by dimensions such as across-flats distance (inscribed-hexagon size). In the 19th and early 20th centuries, it was common to define the nominal size of the wrench according to the nominal size of the screw thread that it was meant to be used on. This is seldom if ever done anymore. (The accompanying photo explains visually.)

Read more about this topic:  Wrench

Famous quotes containing the word size:

    “In mathematics he was greater
    Than Tycho Brahe, or Erra Pater:
    For he, by geometric scale,
    Could take the size of pots of ale;
    Resolve, by sines and tangents straight,
    If bread and butter wanted weight;
    And wisely tell what hour o’ th’ day
    The clock doth strike, by algebra.”
    —Samuel Butler (1612–1680)