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Printable spanner and Allen key size chart
For each bolt: the spanner or socket, the Allen key for its cap screw, the tap drill and the clearance hole. One sheet, fits A4 and US Letter.
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Metric — all sizes in mm Bolt Spanner Old DIN Hex key Tap drill Clear close Clear normal Clear loose M3 5.5 2.5 2.5 3.2 3.4 3.6 M4 7 3 3.3 4.3 4.5 4.8 M5 8 4 4.2 5.3 5.5 5.8 M6 10 5 5 6.4 6.6 7.0 M8 13 6 6.8 8.4 9.0 10.0 M10 16 17 8 8.5 10.5 11.0 12.0 M12 18 19 10 10.2 13.0 13.5 14.5 M14 21 22 12 12 15.0 15.5 16.5 M16 24 14 14 17.0 17.5 18.5 M18 27 14 15.5 19.0 20.0 21.0 M20 30 17 17.5 21.0 22.0 24.0 M22 34 32 17 19.5 23.0 24.0 26.0 M24 36 19 21 25.0 26.0 28.0 M27 41 19 24 28.0 30.0 32.0 M30 46 22 26.5 31.0 33.0 35.0
Inch Bolt Spanner Hex key Coarse thread Tap drill Dia mm 1/4" 7/16″ 3/16″ 1/4-20 UNC #7 6.3 5/16" 1/2″ 1/4″ 5/16-18 UNC F 7.9 3/8" 9/16″ 5/16″ 3/8-16 UNC 5/16″ 9.5 7/16" 5/8″ 3/8″ 7/16-14 UNC U 11.1 1/2" 3/4″ 3/8″ 1/2-13 UNC 27/64″ 12.7 9/16" 13/16″ — 9/16-12 UNC 31/64″ 14.3 5/8" 15/16″ 1/2″ 5/8-11 UNC 17/32″ 15.9 3/4" 1-1/8″ 5/8″ 3/4-10 UNC 21/32″ 19.0 7/8" 1-5/16″ 3/4″ 7/8-9 UNC 49/64″ 22.2 1" 1-1/2″ 3/4″ 1-8 UNC 7/8″ 25.4
Related: Bolt Torque Calculator
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