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    Tread Sizes and Tap Drill Size
    Thread Size/ Tap Drill Size

    *Indicates Size of drill to be used before tapping

    American Standard Thread ISO Metric Thread
    Thread Size Tap Drill Size (in.)* Thread Size Tap Drill Size(mm)*
    0-80 3/64 M1 x 0.25 0.75
    1-64 53 M1.1 x 0.25 0.85
    1-72 53 M1.2 x 0.25 0.95
    2-56 51 M1.4 x 0.3 1.10
    2-64 50 M1.6 x 0.35 1.25
    3-48 5/64 M1.8 x 0.35 1.45
    3-56 46 M2 x 0.4 1.60
    4-40 43 M2.2 x 0.45 1.75
    4-48 42 M2.5 x 0.45 2.05
    5-40 39 M3 x 0.5 2.50
    American Standard Thread ISO Metric Thread
    Thread Size Tap Drill Size (in.)* Thread Size Tap Drill Size(mm)*
    5-44 37 M3.5 x 0.6 2.90
    6-32 36 M4 x 0.7 3.30
    6-40 33 M4.5 x 0.75 3.70
    8-32 29 M5 x 0.8 4.20
    8-36 29 M6 x 1 5.00
    10-24 25 M7 x 1 6.00
    10-32 21 M8 x 1.25 6.80
    12-24 17 M9 x 1.25 7.80
    12-28 15 M10 x 1.5 8.50
    1/4-20 7 M11 x 1.5 9.50
    American Standard Thread ISO Metric Thread
    Thread Size Tap Drill Size (in.)* Thread Size Tap Drill Size(mm)*
    1/4-28 3 M12 x 1.75 10.20
    5/16-18 F M14 x 2 12.00
    5/16-24 I M16 x 2 14.00
    3/8-16 5/16 M18 x 2.5 15.50
    3/8-24 Q M20 x 2.5 17.50
    7/16-14 U M22 x 2.5 19.50
    7/16-20 W M24 x 3 21.00
    1/2-13 27/64 M27 x 3 24.00
    1/2-20 29/64 M30 x 3.5 26.50
    9/16-12 31/64 M33 x 3.5 29.50
    American Standard Thread ISO Metric Thread
    Thread Size Tap Drill Size (in.)* Thread Size Tap Drill Size(mm)*
    9/16-18 33/64 M36 x 4 32.00
    5/8-11 17/32 M39 x 4 35.00
    5/8-18 37/64 M42 x 4.5 37.50
    3/4-10 21/32 M45 x 4.5 40.50
    3/4-16 11/16 M48 x 5 43.00
    7/8-9 49/64 M52 x 5 47.00
    7/8-14 13/16 M56 x 5.5 50.50
    1″-8 7/8 M60 x 5.5 54.50
    1″-14 15/18 M64 x 6 58.00
    M68 x 6 62.00

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