Metric UNC UNF
    Tap Metric Drill Tap Die
    3mm x 0.5 2.5mm
    4mm x 0.7 3.4mm
    5mm x 0.8 4.3mm
    6mm x 1.0 5.2mm
    7mm x 0.75 6.1mm
    7mm x 1.0 6.1mm
    8mm x 1.25 6.9mm
    8mm x 1.0 7.1mm
    10mm x 1.5 8.7mm
    10mm x 1.25 8.9mm
    10mm x 1.0 9.1mm
    12mm x 1.75 10.5mm
    12mm x 1.5 10.7mm
    14mm x 1.0 12.5mm
    18mm x 2.5 15.5mm
    UNC Tap x TPI Imperial Drill Metric equivalent Tap Die
    1 x 64 53 1.5mm
    2 x 56 50 1.8mm
    3 x 48 47 2.1mm
    4 x 40 43 2.3mm
    5 x 40 38 2.6mm
    6 x 32 36 2.8mm
    8 x 32 29 3.4mm
    10 x 24 25 3.8mm
    12 x 24 16 4.4mm
    1/4 x 20 7 5.1mm
    5/16 x 18 F 6.5mm
    3/8 x 16 5/16 8.0mm
    7/16 x 14 U 9.5mm
    1/2 x 13 27/64 11.0mm
    UNF Tap x TPI Imperial Drill Metric equivalent Tap Die
    0 x 80 3/68 1.1mm
    1 x 72 53 1.5mm
    2 x 64 50 1.8mm
    3 x 56 45 2.2mm
    4 x 48 42 2.4mm
    5 x 44 37 2.7mm
    6 x 40 33 2.9mm
    8 x 36 29 3.5mm
    10 x 32 21 4.0mm
    12 x 28 14 4.6mm
    1/4 x 28 3 5.4mm
    5/16 x 24 I 6.8mm
    3/8 x 24 Q 8.4mm
    7/16 x 20 25/64 9.8mm
    1/2 x 20 29/64 11.5mm
    1/2 x 28 29/64 11.5mm
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