Machinery's Handbook, 31st Edition
Metric Screws and Bolts 1723 Table 11. ANSI Heavy Hex Bolts ANSI/ASME B18.2.3.6M-1979 (Withdrawn)
K K 1
S
E
D s
R
B*
(REF)
L g
Property Class and Manu- facturer’s Identification to Appear on Top of Head
15°–30°
L
Body Diameter, D s
Width Across Flats, S
Width Across Corners, E
Head Height, K
Wrenching Height, K 1
Nominal Dia., D and Thread Pitch
Max.
Min.
Max.
Min.
Max.
Min.
Max. 7.95 9.25
Min. 7.24 8.51 9.68
Min.
12.70 11.30 21.00 20.16 24.25 22.78 14.70 13.30 24.00 23.16 27.71 26.17
5.2 6.2 7.0 8.8
M12 × 1.75 M14 × 2 M16 × 2 M20 × 2.5 M24 × 3 M30 × 3.5 M36 × 4
16.70 15.30 27.00 26.16 31.18 29.56 10.75
20.84 19.16 34.00 33.00 39.26 37.29 13.40 12.12 24.84 23.16 41.00 40.00 47.34 45.20 15.90 14.56 30.84 29.16 50.00 49.00 57.74 55.37 19.75 17.92 37.00 35.00 60.00 58.80 69.28 66.44 23.55 21.72
10.5 13.1
15.8 All dimensions are in millimeters.*Basic thread lengths, B , are the same as given in Table 13 . For additional manufacturing and acceptance specifications, reference should be made to the ANSI/ ASME B18.2.3.6M-1979 (Withdrawn) standard. Table 12. Metric Heavy Hex Structural Bolts ANSI/ASME B18.2.6M-2012
K 1 K
L
L g
B(REF)*
L s
S
C
(REF)*
X
D s D s
E
Optional Point Construction
Fillet
15°–30°
Z ‡
Property Class and Manufacturer’s Identification to Appear on Top of Head
Incomplete Thread
Thread Length, B a
Washer Face Thickness, C
Width Across Corners, E
Head Height, K
Body Diameter, D s
Width Across Flats, S
Dia. D , and Thread Pitch
Max. Min. Max. Min. Max. Min. Max. Min. Min. Min. Max. Min. 16.70 15.30 27.00 26.16 31.18 29.56 10.75 9.25 6.5 24.9 0.8 0.4 31 38 6.0 M20 × 2.5 20.84 19.16 34.00 33.00 39.26 37.29 13.40 11.60 8.1 31.4 0.8 0.4 36 43 7.5 M22 × 2.5 22.84 21.16 36.00 35.00 41.57 39.55 14.90 13.10 9.2 33.3 0.8 0.4 38 45 7.5 M24 × 3 24.84 23.16 41.00 40.00 47.34 45.20 15.90 14.10 9.9 38.0 0.8 0.4 41 48 9.0 M27 × 3 27.84 26.16 46.00 45.00 53.12 50.85 17.90 16.10 11.3 42.8 0.8 0.4 44 51 9.0 M30 × 3.5 30.84 29.16 50.00 49.00 57.74 55.37 19.75 17.65 12.4 46.5 0.8 0.4 49 56 10.5 M36 × 4 37.00 35.00 60.00 58.80 69.28 66.44 23.55 21.45 15.0 55.9 0.8 0.4 56 63 12.0 a Basic thread length, B, is a reference dimension. b 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. All dimensions are in millimeters. For additional manufacturing and acceptance specifications, reference should be made to the ANSI/ASME B18.2.6M-2012 standard. Basic Max. M16 × 2
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