Machinery's Handbook, 31st Edition
1828
Socket Screws Table 2. British Standard Hexagon Socket Screws.—Metric Series BS 4168:Part 1:1981 (obsolescent) Dimensions of Hexagon Sockets J
Socket Width Across Flats, J
Socket Width Across Flats, J
Nominal Socket Size
Nominal Socket Size
Max.
Min. 1.52 2.02 2.52 3.02 4.02 5.02
Max.
Min.
1.5 2.0 2.5
1.545 2.045 2.56 3.08 4.095 5.095
6 8
6.095 8.115 10.115 12.142 14.142 17.23 19.275
6.02 8.025 10.025 12.032 14.032 17.05 19.065
10 12 14 17 19
3 4 5
…
…
…
Association of Nominal and Thread Lengths for Each Thread Size
Nominal Thread Size, D
Nominal Thread Size, D
2.5
16 20 25 30 35 40 45 50 55 60 65 70 80 90
3 4 5 6 8
10 12 16 20 25 30 35 40 45 50 55 60 65 70 80
100 110 120 130 140 150
160 … …………………… 180 … …………………… 200 b (ref) 15 16 17 18 20 22 24 28 b (ref)
32 36 40 44 52 60 72 84
All dimensions are in millimeters. The popular lengths are those between the stepped solid lines. Lengths above the shaded areas are threaded to the head within 3 pitch lengths (3 P ). Lengths within and below the shaded areas have values of L g and L s (see Table 1 ) given by the formulas: L g max = L nom − b ref, and L s min = L g max − 5 P .
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