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Unit:inch

Square Head Screws Faced Under Head with B.S.Threads - Black [Table 2]

BS 916 - 1953

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英标BS 916 - 1953 BS916 916BS Square Head Screws Faced Under Head with B.S.Threads - Black [Table 2]
Thread Size
d
1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 (1-3/8) 1-1/2 (1-5/8)
PP No. of Threads/Inch BSW
BSF
s max
min
e max
R max
k max
min
20 18 16 14 12 12 11 10 9 8 7 7 6 6 5
26 22 20 18 16 16 14 12 11 10 9 9 8 8 8
0.445 0.525 0.600 0.710 0.820 0.920 1.010 1.200 1.300 1.480 1.670 1.860 2.050 2.220 2.410
0.435 0.515 0.585 0.695 0.800 0.900 0.985 1.175 1.270 1.450 1.640 1.815 2.005 2.175 2.365
0.63 0.74 0.85 1.00 1.16 1.30 1.43 1.70 1.84 2.09 2.36 2.63 2.90 3.14 3.41
1/32 1/32 1/32 1/32 1/32 1/32 1/32 1/32 1/32 1/32 3/64 3/64 3/64 3/64 3/64
0.176 0.218 0.260 0.302 0.343 0.375 0.417 0.500 0.583 0.666 0.75 0.83 0.92 1.00 1.08
0.156 0.198 0.240 0.282 0.323 0.345 0.387 0.470 0.553 0.636 0.71 0.79 0.88 0.96 1.02
Thread Size
d
1-3/4 2 2-1/4 2-1/2 2-3/4 3 (3-1/4) 3-1/2 (3-3/4) 4 4-1/2 5 5-1/2 6
PP No. of Threads/Inch BSW
BSF
s max
min
e max
R max
k max
min
5 4.5 4 4 3.5 3.5 3.25 3.25 3 3 2.875 2.75 2.625 2.5
7 7 6 6 6 5 5 4.5 4.5 4.5 4 4 4 4
2.580 2.760 3.150 3.550 3.890 4.180 4.530 4.850 5.180 5.550 6.380 7.300 8.350 9.450
2.520 2.700 3.090 3.490 3.830 4.080 4.430 4.750 5.080 5.450 6.255 7.175 8.225 9.325
3.65 3.90 4.45 5.02 5.50 5.91 6.41 6.86 7.33 7.85 9.02 10.32 11.81 13.36
3/64 3/64 1/16 1/16 1/16 1/16 3/32 3/32 3/32 3/32 1/8 1/8 1/8 1/8
1.17 1.33 1.50 1.67 1.83 2.00 2.17 2.33 2.50 2.67 3.00 3.33 3.67 4.00
1.11 1.27 1.42 1.59 1.75 1.90 2.07 2.23 2.40 2.57 2.85 3.18 3.52 3.85
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