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474 Starrett Screw Pitch Gage, 2 1/4-84 TPI, 0.25-11.5 Pitches
 
474 Starrett Screw Pitch Gage, 2 1/4-84 TPI,  0.25-11.5 Pitches
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    474
    Starrett Screw Pitch Gage
    4-80 TPI Range

    Starrett screw pitch gages are among the
    most useful tools in any mechanics’ tool box.
    They quickly determine the pitch of various
    threads. These gages consist of a substantial
    steel case with a number of folding leaves
    at both ends, each leaf having teeth
    corresponding to a definite pitch, marked on
    each leaf.
    Starrett screw pitch gages are available in a
    wide range of sizes with different numbers of
    leaves in various pitch ranges with which to
    gage.
    V, Unified, American National 60º threads
    Whitworth Standard 55º threads
    International Metric Standard 60º threads
    English and metric threads are similar in form,
    but English threads are described in threads
    per inch and metric threads by the distance
    from one crest to the next.
    All Starrett screw pitch gages (except 473
    and 476, which have a positive stop design)
    feature a locking device at both ends of the
    case, so leaves can be securely locked in
    position for use. Leaves on most gages have
    a special narrow design, permitting checking
    internal threads in nuts, etc., as well as
    external threads.
    Various types of Starrett screw pitch gages
    are illustrated on the following pages, with
    complete specifications.
    Screw Pitch Gages
    Catalog No. No. of Leaves TPI Range Threads per Inch (TPI) Description
    155
    27
    2-1/4–28
    2-1/4, 2-3/8, 2-1/2, 2-5/8, 2-3/4, 2-7/8, 3, 3-1/4, 3-1/2, 4, 4-1/2, 5, 5-1/2, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 20, 24, 28 With Locking Device and 60º Center Gage
    484
    28
    3-1/2–36
    3-1/2, 4, 4-1/2, 5, 5-1/2, 6, 7, 8, 9, 10, 11, 11-1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 36 With Locking Device
    6
    30
    4–42
    4, 4-1/2, 5, 5-1/2, 6, 7, 8, 9, 10, 11, 11-1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 40, 42 With Locking Device and 11-1/2 and 27 Pipe
    Thread Pitches
    474
    28
    4–80
    4, 4-1/2, 5, 6, 7, 8, 9, 10, 11, 11-1/2, 12, 13, 14, 16, 18, 20, 24, 27, 28, 32, 36, 40, 44, 48, 56, 64, 72, 80
    472
    51
    4–84
    First Corner 17 Leaves: 4, 4-1/2, 5, 5-1/2, 6, 7, 8, 9, 10, 11, 11-1/2, 12, 13, 14, 15, 16, 18
    Second Corner 17 Leaves: 20, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50
    Third Corner 17 Leaves: 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84
    473
    30
    6–60
    6, 7, 8, 9, 10, 11, 11-1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 40, 42, 48, 50, 56, 60 With Positive Stop and 11-1/2 and 27 Pipe Thread Pitches
    476
    30
    3-1/2–60
    3-1/2, 4, 4-1/2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 19, 20, 22, 24, 25, 26, 28, 30, 32, 36, 40, 44, 48, 50, 60 With Positive Stop
    156M
    28
    0.25-2.50mm
    0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 1, 1.10, 1.20, 1.25, 1.30, 1.40, 1.50, 1.60, 1.70, 1.75, 1.80, 1.90, 2, 2.50 With Locking Device
    159M
    28
    0.5-11.5mm
    0.5, 0.75, 1, 1.10, 1.25, 1.5, 1.75, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5 With Locking Device and 60º Center Gage