Metric Screws and Bolts Machinery's Handbook, 31st Edition
1715
Table 2. American National Standard Metric Formed Hex Screws ANSI/ASME B18.2.3.2M-2005 (Withdrawn)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
Optional Head Design
Nominal Screw Dia., D , and Thread Pitch M5 × 0.8 M6 × 1
Washer Face Dia., D w
Width Across Flats, S
Width Across Corners, E
Washer Face Thick., C
Wrenching Height, K 1
Body Dia., D s
Head Height, K
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Min.
Max. Min. Max.
5.00 4.82 8.00 7.64 9.24 8.56 3.65 3.35 6.00 5.82 10.00 9.64 11.55 10.80 4.15 3.85
2.4 0.5 0.2 2.0 0.5 0.2
6.9 8.9
3.7 0.6 0.3 11.6 4.5 0.6 0.3 13.6 4.5 0.6 0.3 14.6 5.2 0.6 0.3 16.6 6.2 0.6 0.3 19.6 7.0 0.8 0.4 22.5 8.8 0.8 0.4 27.7
M8 × 1.25 8.00 7.78 13.00 12.57 15.01 14.08 5.50 5.10 a M10 × 1.5 10.00 9.78 15.00 14.57 17.32 16.32 6.63 6.17 M10 × 1.5 10.00 9.78 16.00 15.57 18.48 17.43 6.63 6.17 M12 × 1.75 12.00 11.73 18.00 17.57 20.78 19.68 7.76 7.24
14.00 13.73 21.00 20.16 24.25 22.58 9.09 8.51 16.00 15.73 24.00 23.16 27.71 25.94 10.32 9.68
M14 × 2 M16 × 2
M20 × 2.5 20.00 19.67 30.00 29.16 34.64 32.66 12.88 12.12 24.00 23.67 36.00 35.00 41.57 39.20 15.44 14.46
M24 × 3 10.5 0.8 0.4 33.2 a This size with width across flats of 15 mm is not standard. Unless specifically ordered, M10 formed hex screws with 16 mm width across flats will be furnished. 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 the grip gaging length and body length. It is intended for calculation purposes. For additional manufacturing and acceptance specifications, reference should be made to the Standard. Socket head cap screws ANSI/ASME B18.3.1M-1986 (Withdrawn) are functionally interchangeable with screws which conform to ISO R861-1968 or ISO 4762-1977. However, the thread lengths specified in the ANSI Standard are equal to or longer than required by either ISO Standard. Consequently the grip lengths also vary on screws where the North American thread length practice differs. Minor variations in head diameter, head height, key engagement and wall thickness are due to diverse tolerancing practice and will be found documented in the ANSI Standard. One exception with respect to width across flats for metric hex cap screws, formed hex screws, and hex bolts is the M10 size. These are currently being produced in the United States with a width across flats of 15 mm. This size, however, is not an ISO Standard. Unless these M10 screws and bolts with 15 mm width across flats are specifically ordered, the M10 size with 16 mm across flats will be furnished.
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