STS Industrial - Bolts & Screws

 

PIPE THREAD TAPS

Pipe thread taps are sized to thread NPT (Taper Pipe Thread) or NPS (Straight Pipe Thread) pipe and pipe fittings. The nominal size of a pipe tap is that of the pipe fitting to be tapped, not the actual size of the tap. A variety of tap types are available for any material or application. For best results and longest tool life, always use with cutting fluid.

NPT Pipe Tap

  • TAPER PIPE TAP:

    Made in the USA. Designed to produce threads where mated parts utilize tapered pipe threads.

    NPT Pipe Tap

    AVAILABLE SIZES:

    SIZE

    THREAD

    OVERALL LENGTH

    LENGTH OF THREADS

    NO. OF FLUTES

      1/16 27 2  1/8  11/16 4
      1/8 27 2  1/8   3/4 4
      1/4 18 2  7/16 1  1/16 4
      3/8 18 2  9/16 1  1/16 4
      1/2 14 3  1/8 1  3/8 4
      3/4 14 3  1/4 1  3/8 5
    1 11  1/2 3  3/4 1  3/4 5
    1  1/4 11  1/2 4 1  3/4 5
    1  1/2 11  1/2 4  1/4 1  3/4 7
    2 11  1/2 4  1/4 1  3/4 7
    2  1/2 8 5  1/2 2  9/16 8
    3 8 6 2  5/8 8
    3  1/2 8 6  1/2 2 11/16 8
    4 8 6  3/4 2  3/4 8

    All dimensions are in inches.

  • STRAIGHT PIPE TAP:

    Made in the USA. Designed to produce threads where mated parts utilize straight pipe threads.

    NPS Pipe Tap

    AVAILABLE SIZES:

    SIZE

    THREAD

    LENGTH OF THREADS

    NO. OF FLUTES

      1/8 27   3/4 4
      1/4 18 1  1/16 4
      3/8 18 1  1/16 4
      1/2 14 1  3/8 4
      3/4 14 1  3/8 5
    1 11  1/2 1  3/4 5

    All dimensions are in inches.

  • INTERRUPTED THREAD TAPER PIPE TAP:

    Made in the USA. Designed to thread a variety of materials, both ferrous and non ferrous, where tooth loading and chip disposal is a problem. The first few threads are full and the balance are interrupted, with every other tooth removed. This reduces drag while tapping taper pipe threads, and makes it easier for lubricant to reach the cutting edges. It also reduces friction and tapping torque.

    NPT Interrupted Thread Pipe Tap

    AVAILABLE SIZES:

    SIZE

    THREAD

    LENGTH OF THREADS

    NO. OF FLUTES

      1/8 27   3/4 5
      1/4 18 1  1/16 5
      3/8 18 1  1/16 5
      1/2 14 1  3/8 5
      3/4 14 1  3/8 5
    1 11  1/2 1  3/4 5
    1  1/4 11  1/2 1  3/4 5
    1  1/2 11  1/2 1  3/4 7
    2 11  1/2 1  3/4 7

    All dimensions in inches.

  • LOW HOOK TAPER PIPE TAP:

    Made in the USA. Special tooth geometry designed for use in pipe and fittings in castings and similar materials that produce granular chips.

    NPT Pipe Tap

    AVAILABLE SIZES:

    SIZE

    THREAD

    LENGTH OF THREADS

    NO. OF FLUTES

      1/16 27  11/16 4
      1/8 27   3/4 4
      1/4 18 1  1/16 4
      3/8 18 1  1/16 4
      1/2 14 1  3/8 4
      3/4 14 1  3/8 5
    1 11  1/2 1  3/4 5
    1  1/4 11  1/2 1  3/4 5
    1  1/2 11  1/2 1  3/4 7
    2 11  1/2 1  3/4 7

    All dimensions in inches.

  • HIGH HOOK TAPER PIPE TAP:

    Made in the USA. Special tooth geometry designed for tapping ductile materials which normally produce long continuous chips, such as aluminum, free machining stainless, mild steels, and plastics.

    NPT Pipe Tap

    AVAILABLE SIZES:

    SIZE

    THREAD

    LENGTH OF THREADS

    NO. OF FLUTES

      1/16 27  11/16 4
      1/8 27   3/4 4
      1/4 18 1  1/16 4
      3/8 18 1  1/16 4
      1/2 14 1  3/8 4
      3/4 14 1  3/8 5
    1 11  1/2 1  3/4 5
    1  1/4 11  1/2 1  3/4 5
    1  1/2 11  1/2 1  3/4 7
    2 11  1/2 1  3/4 7

    All dimensions in inches.

    • STANDARD TAP DRILL SIZES

      TAP SIZE

      THREAD

      DRILL SIZE

      % OF THREAD

      0 80   3/64 71-81
      1 64 53 59-67
      1 72 53 67-75
      2 56 50 62-69
      2 64 50 70-79
      3 48   5/64 70-77
      3 56 46 69-78
      4 40 43 65-71
      4 48 42 61-68
      5 40 38 65-72
      5 44 37 63-71
      6 32 36 71-78
      6 40 33 69-77
      8 32 29 62-69
      8 36 29 70-78
      10 24 25 69-75
      10 32 21 68-79
      12 24 16 66-72
      12 28 15 70-78
        1/4 20 7 70-75
        1/4 28 3 72-80
        5/16 18 F 72-77
        5/16 24 1 67-75
        3/8 16   5/16 72-77

      TAP SIZE

      THREAD

      DRILL SIZE

      % OF THREAD

        3/8 24 Q 71-79
        7/16 14 U 70-75
        7/16 20  25/64 65-72
        1/2 13  27/64 73-78
        1/2 20  29/64 65-72
        9/16 12  31/64 68-72
        9/16 18  33/64 58-65
        5/8 11  17/32 75-79
        5/8 18  37/64 58-65
        3/4 10  21/32 68-72
        3/4 16  11/16 71-77
        7/8 9  49/64 72-76
        7/8 14  13/16 62-67
      1 8   7/8 73-77
      1 12  59/64 67-75
      1 14  15/16 61-67
      1  1/8 7  63/64 72-76
      1  1/8 12 1  3/16 66-72
      1  1/4 7 1  7/64 76
      1  1/4 12 1 11/64 72
      1  3/8 6 1  7/32 72
      1  3/8 12 1 19/64 72
      1  1/2 6 1 11/32 72
      1  1/2 12 1 27/64 72

      Drill sizes shown are applicable for taps sold from STS Industrial.

    • METRIC TAP DRILL SIZES

      TAP SIZE

      THREAD

      DRILL SIZE

      % OF THREAD

      1.6 0.35 1.25 MM 69
      1.8 0.35 1.45 MM 69
      2 0.40 1.60 MM 69
        1/16 66
      2.2 0.45 1.75 MM 70
      2.5 0.45 2.05 MM 69
      46 67
      3 0.50 40 70
      3.5 0.60 33 72
      4 0.70 30 73
      4.5 0.75 3.70 MM 74
      26 70
      5 0.80 4.2 MM 69
      19 68
      5.5 0.90 4.6 MM 68
      14 67
      6 0.75 5.30 MM 74
      4 73
      6 1.00 10 71
      7 0.75 6.30 MM 74
      D 72
      7 1.00  15/64 73
      8 1.25 6.70 MM 74
      8 1.00 7.00 MM 69
      J 66

      TAP SIZE

      THREAD

      DRILL SIZE

      % OF THREAD

      9 1.25 7.75 MM 73
      10 1.50 8.40 MM 76-82
      10 1.25 8.7 MM 73
       11/32 71
      11 1.50   3/8 71
      12 1.75 10.20 MM 74
       13/32 71
      12 1.25  27/64 72
      14 2.00 15/32 76-81
      14 1.50 12.50 MM 71
      16 2.00 35/64 76-81
      18 2.50 39/64 74
      18 1.50 16.50 MM 70
      20 2.50  11/16 74-78
      22 2.50 49/64 75
      24 3.00 21.00 MM 73
      53/64 72-76
      27 3.00 24.00 MM 73
      15/16 78
      30 3.50 1  3/64 75
      33 3.50 29.50 MM 74
      1 11/64 72
      36 4.00 1  1/4 82

      Drill sizes shown are applicable for taps sold from STS Industrial.

    • PIPE THREAD TAP DRILL SIZES

      TAPER PIPE NPT

      TAP SIZE

      THREAD

      DRILL SIZE

        1/8 27 Q
        1/4 18   7/16
        3/8 18   9/16
        1/2 14  45/64
        3/4 14  29/32
      1 11  1/2 1  9/64
      1  1/4 11  1/2 1 31/64
      1  1/2 11  1/2 1 23/32
      2 11  1/2 2  3/16
      2  1/2 8 2 39/64
      3 8 3 15/64

      STRAIGHT PIPE NPS

      TAP SIZE

      THREAD

      DRILL SIZE

        1/8 27  11/32
        1/4 18   7/16
        3/8 18  37/64
        1/2 14  23/32
        3/4 14  59/64
      1 11  1/2 1  5/32
      1  1/4 11  1/2 1  1/2
      1  1/2 11  1/2 1  3/4
      2 11  1/2 2  7/32
      2  1/2 8 2 21/32
      3 8 3 15/64

      Drill sizes shown are applicable for taps sold from STS Industrial.

    • TROUBLESHOOTING

      Tap Troubleshooting Guide


Sources: Drillco Cutting Tools Product Catalog 2013, Champion Cutting Tools 2011 Product Catalog, Norseman/CTD Product Catalog 2013 Note: All material included on this page is informational only, and should not be used as one’s sole source for design purposes. STS Industrial, Inc. and its affiliates do not guarantee the accuracy of the information on this site, and retain no liability for the use or misuse of the information contained on this site.