07 11 07 11 07 11 - Reproduction, even in part prohibited. Printed in UK Modified: 21 August 2024 Screw Size Conversion Chart Imperial to Metric, approximate to the nearest equivalent. Imperial Metric Imperial Metric Imperial Metric 4 x 3/8 3 x 8 8 x 2 1/2 4 x 63 10 x 2 5 x 50 4 x 1/2 3 x 12 8 x 3 4 x 75 10 x 2 1/4 5 x 55 4 x 5/8 3 x 16 8 x 1/2 4 x 12 10 x 2 3/8 5 x 60 4 x 3/4 3 x 20 8 x 5/8 4 x 16 10 x 2 1/2 5 x 63 4 x 1 3 x 25 8 x 3/4 4 x 20 10 x 2 3/4 5 x 70 4 x 1 1/4 3 x 30 8 x 1 4 x 25 10 x 3 5 x 75 4 x 1 3/8 3 x 35 8 x 1 1/4 4 x 30 10 x 3 1/4 5 x 80 4 x 1 1/2 3 x 40 8 x 1 3/8 4 x 35 10 x 3 1/2 5 x 90 4 x 1 3/4 3 x 45 8 x 1 1/2 4 x 40 10 x 4 5 x 100 4 x 2 3 x 50 8 x 1 3/4 4 x 45 12 x 1 6 x 25 6 x 1/2 3.5 x 12 8 x 2 4 x 50 12 x 1 1/4 6 x 30 6 x 5/8 3.5 x 16 8 x 2 1/4 4 x 55 12 x 1 1/2 6 x 40 6 x 3/4 3.5 x 20 8 x 2 1/2 4 x 63 12 x 2 6 x 50 6 x 1 3.5 x 25 8 x 3 4 x 75 12 x 2 1/4 6 x 55 6 x 1 3/8 3.5 x 35 10 x 3/4 5 x 20 12 x 2 1/2 6 x 63 6 x 1 1/2 3.5 x 40 10 x 1 5 x 25 12 x 3 6 x 75 6 x 1 3/4 3.5 x 45 10 x 1 1/4 5 x 30 12 x 3 1/2 6 x 90 6 x 2 3.5 x 50 10 x 1 3/8 5 x 35 12 x 4 6 x 100 6 x 2 1/4 3.5 x 55 10 x 1 1/2 5 x 40 6 x 2 3/8 3.5 x 60 10 x 1 3/4 5 x 45 Decimal Equivalents Reference Table Fraction mm Fraction mm Fraction mm Fraction mm 1/64 0.397 17/64 6.747 33/67 13.097 49/64 19.447 1/32 0.794 9/32 7.144 17/32 13.494 25/32 19.844 3/64 1.191 19/64 7.541 35/64 13.891 51/64 20.241 1/16 1.588 5/16 7.938 9/16 14.288 13/16 20.638 5/64 1.984 21/64 8.334 37/64 14.684 53/64 21.034 3/32 2.381 11/32 8.731 19/32 15.081 27/32 21.431 7/64 2.778 23/64 9.128 39/64 15.478 55/64 21.828 1/8 3.175 3/8 9.525 5/8 15.875 7/8 22.225 9/64 3.572 25/64 93922 41/64 16.272 57/64 22.622 5/32 3.969 13/32 10.319 21/32 16.669 29/32 23.019 11/64 4.366 27/64 10.716 43/64 17.066 59/64 23.416 3/16 4.762 7/16 11.112 11/16 17.462 15/16 23.812 13/64 5.159 29/64 11.509 45/64 17.859 61/64 24.209 7/32 5.556 15/32 11.906 23/32 18.256 31/32 24.606 15/64 5.953 31/64 12.303 47/64 18.653 63/64 25.003 1/4 6.35 1/2 12.7 3/4 19.050 1 25.400
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