Machinery's Handbook, 31st Edition
1714
Metric Screws and Bolts Table 1. American National Standard Metric Hex Cap Screws ANSI/ASME B18.2.3.1M-1999 (Withdrawn)
K K 1
L
L g
B (REF)
L s
S
C X (REF)
E
D w
D s
Incomplete Thread Optional Point Construction
Fillet
15°–30°
Property Class and Manu- facturer’s Identification to Appear on Top of Head
Nominal Screw Diameter, D and Thread Pitch
Washer Face Thick., C
Width Across Corners, E
Width Across Flats, S
Body Diameter D s
Head Height, K
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Min. Max. Min. Min.
5.00 4.82 8.00 7.78 9.24 8.79 3.65 3.35 2.4 0.5 0.2 7.0 6.00 5.82 10.00 9.78 11.55 11.05 4.15 3.85 2.8 0.5 0.2 8.9 8.00 7.78 13.00 12.73 15.01 14.38 5.50 5.10 3.7 0.6 0.3 11.6 10.00 9.78 15.00 14.73 17.32 16.64 6.63 6.17 4.5 0.6 0.3 13.6 10.00 9.78 16.00 15.73 18.48 17.77 6.63 6.17 4.5 0.6 0.3 14.6 12.00 11.73 18.00 17.73 20.78 20.03 7.76 7.24 5.2 0.6 0.3 16.6 14.00 13.73 21.00 20.67 24.25 23.35 9.09 8.51 6.2 0.6 0.3 19.6 16.00 15.73 24.00 23.67 27.71 26.75 10.32 9.68 7.0 0.8 0.4 22.49 20.00 19.67 30.00 29.16 34.64 32.95 12.88 12.12 8.8 0.8 0.4 27.7 24.00 23.67 36.00 35.00 41.57 39.55 15.44 14.56 10.5 0.8 0.4 33.2 30.00 29.67 46.00 45.00 53.12 50.85 19.48 17.92 13.1 0.8 0.4 42.7 36.00 35.61 55.00 53.80 63.51 60.79 23.38 21.62 15.8 0.8 0.4 51.1 42.00 41.38 65.00 62.90 75.06 71.71 26.97 25.03 18.2 1.0 0.5 59.8 48.00 47.38 75.00 72.60 86.60 82.76 31.07 28.93 21.0 1.0 0.5 69.0 56.00 55.26 85.00 82.20 98.15 93.71 36.20 33.80 24.5 1.0 0.5 78.1 64.00 63.26 95.00 91.80 109.70 104.65 41.32 38.68 28.0 1.0 0.5 87.2 72.00 71.26 105.00 101.40 121.24 115.60 46.45 43.55 31.5 1.2 0.6 96.3 80.00 79.26 115.00 111.00 132.72 126.54 51.58 48.42 35.0 1.2 0.6 105.4 90.00 89.13 130.00 125.50 150.11 143.07 57.75 54.26 39.2 1.2 0.6 119.2
M5 × 0.8
M6 × 1
M8 × 1.25 a M10 × 1.5 M10 × 1.5 M12 × 1.75
M14 × 2 M16 × 2
M20 × 2.5
M24 × 3
M30 × 3.5
M36 × 4
M42 × 4.5
M48 × 5
M56 × 5.5
M64 × 6 M72 × 6 M80 × 6 M90 × 6
M100 × 6 100.00 99.13 145.00 140.00 167.43 159.60 63.90 60.10 43.4 1.2 0.6 133.0 a This size with width across flats of 15 mm is not standard. M10 screws with 15 mm width across flats are commonly produced in United States and other countries. The width across flats for all M10’s should be specified. All sizes except the following are included in ISO 4014 and ISO 4017:M10 × 1.5 with 15 mm width across flats, and M72 through M100. All dimensions are in millimeters. Basic thread lengths, B , are the same as given in Table 13. Transition thread length, X , includes the length of incomplete threads and tolerances on grip gaging length and body length. It is intended for calculation purposes. For additional manufacturing and acceptance specifications, reference should be made to the ANSI/ASME B18.2.3.1M-1999 (Withdrawn).
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