20.06 20.36 25.06 25.36 5.21 5.33 6.00 6.13 6.82 6.97 7.62 7.77 8.41 8.56 10.39 10.55 11.99 12.14 13.60 13.77 15.18 15.36 16.77 16.95 19.97 20.17 24.76 24.99 30.34 30.59 3.23 3.35 4.01 4.14 6.60 6.70 7.60 7.70 8.70 8.80 11.38 11.45 13.44 13.54 15.34 15.44 18.16 18.29 20.95 21.08 23.52 23.67 25.81 25.96 28.12 28.30 30.66 30.84 33.22 33.43 35.51 35.71 1/16 3/32 1/8 3/16 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 3/16 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 7/8 15/16 .256 .297 .340 .445 .525 .600 .710 .820 .920 1.010 1.100 1.200 1.300 1.390 5.59 5.72 35.13 35.41 7.19 7.32 2.52 2.58 3.02 3.08 3.52 3.60 29.08 29.48 35.10 35.60 4.52 4.62 34.08 34.48 6.03 6.15 9.03 9.15 3.22 3.28 4.02 4.12 5.02 5.12 5.52 5.62 7.03 7.15 12.04 12.24 8.03 8.15 10.04 10.19 30.08 30.48 14.05 14.27 17.05 17.30 19.06 19.36 22.06 22.36 27.08 27.48 32.08 32.48 36.10 36.60 12 16 20 22 23.06 23.36 11.04 11.19 3 5 3.5 4 8 10 12+14 16 18+20 22+24 6 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1/4 13.04 13.24 15.05 15.27 21.06 21.36 24.06 24.36 1 1.2+1.4 1.7 2.3 3.5 6 1.6 2 2.5+2.6 3 4 5 6 20 80) 10 12 14 18 22 24 7 8 105) 16 1.6 2 2.5 3 4 5 6 20 10 12 14 18 22 24 7 8 16 8 22 10 12 14 16 20 24 27 18 6 8 24 12 16 30 10 20 28.08 28.48 33.08 33.48 4.83 4.95 6.40 6.53 8.03 8.18 8.81 8.97 27.13 27.36 31.93 32.18 12.80 12.95 17.58 17.75 23.98 24.21 11.18 11.33 1/4 14.38 14.55 5/16 15.98 16.15 3/8 19.18 19.38 7/16 20.78 20.98 1/2 22.35 22.56 5/8 3/4 1/2 5/8 3/4 1/4 3/8 5/16 7/16 1/2 5/8 3/4 1/4 3/8 9/16 5/16 7/16 9/16 1/2 25.55 25.78 5/8 28.75 29.01 3/4 33.53 33.81 No2 No3.4+5 No6+8 No10+12 5/16 5/8 1/4 3/8 7/16 1/2 9/16 3/4 7/8 5/16 5/8 1/4 3/8 7/16 1/2 9/16 3/4 7/8 5/16 7/16 5/8 1/4 3/8 1/2 9/16 3/4 7/8 5/16 7/16 5/8 1/4 3/8 1/2 9/16 3/4 7/8 7/8 Socket Opening Metric sizes Thread diameters American sizes English sizes Thread Diam Nomal Series Heavy Series Nuts Nuts Bolts and Screws W BS Thread diameters German Standard minimum dimension 1) maximum dimension 2) nominal size of wrench mm Nominal Size of Wrench Whitworth Large BS 916, 1953 and BS 1083, 1968, 1965 Width across flats inch a Normal d Normal b Square c Heavy e Heavy f Machine Screws g Set Screws Square h Machine Screw Nuts Bolts Bolts Nuts Nuts Bolts Nuts Actual A/F standard hexagon small hexagon DIN...........2) DIN561+564 DIN6914+6915 Danish Stand DS 17 NFE 27-111-19303 Metric large SMS 1412 Metric small SMS 1414 Whitworth large SMS 1413 Whitworth small SMS 1415 metric Swedish Standards ISO R2721968 ISO R272-1962 French Standard SW 16.05 16.27 18 22 3.5 5.5 2.5 3 4+4.5 7 5 6 8 10 11 20 14 12 9 Spark plug M10x1.0 18.05 18.30 2.6 24 3.5 2.3 3 4 8 5 6 20 18 22 7 10 14 16 12 1/2 1/4 5/16 7/16 5/8 3/4 3/8 1/4 5/16 3/8 1/2 5/8 3/4 7/8 7/16 Spark plug M12x1.25 20.86 21.16 Spark plug M14x1.25 26.08 26.48 20 25 2.5 3 3.5 29 35 4.5 34 6 9 3.2 4 5 5.5 7 12 8 10 30 14 17 19 22 27 32 36 23 11 13 15 21 24 28 33 16 18 20.8 26 Spark plug M18x1.5 9.60 9.75 13/64 15/64 17/64 19/64 21/64 13/32 15/32 17/32 19/32 21/32 25/32 31/32 1 3/16 1/8 5/32 7/32 1 3/8 9/32 3/16 1/4 5/16 11/32 1 1/16 1 1/4 1/2 11/16 15/16 7/16 9/16 5/8 3/4 13/16 7/8 1 1 1/8 1 5/16 3/8 No0+1 No2+3 No4 No5+6 No8 5/16 7/16 5/8 No12.1/4 3/8 1/2 9/16 3/4 7/8 No10 No2+3 No4+5 No6+8 No10+12 5/16 3/8 1/4 No0+1 No2+3 No4 No5+6 No8 No12.1/4 5/16 3/8 No10 No12 1 3/8 No10 1/4 5/16 1 1/4 1/2 7/16 9/16 5/8 3/4 7/8 1 1 1/8 3/8 19 25 31 34 106 125 50 69 94 44 56 62 75 81 88 100 112 131 38 No10 5/16 5/8 1/4 3/8 7/16 1/2 9/16 3/4 7/8 1/4 of German, American, British, Norwegian, French, and Swedish sizes for Wrenches Equivalent Standard Bolt Diameters 324
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