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BS 4174 - 1972 Round Head Type U Metallic Drive Screws [Table 22]


Unit:
Size
00# 0# 2#
d (mm) max
min
dp (mm) max
min
dk (mm) max
min
k (mm) max
min
Number of thread starts
d (in.) max
min
dp (in.) max
min
dk (in.) max
min
k (in.) max
min
1.52 1.90 2.54
1.45 1.83 2.46
1.24 1.60 2.11
1.17 1.52 2.03
2.51 3.22 4.11
2.29 3.00 3.71
0.86 1.24 1.75
0.66 1.04 1.50
6 6 8
0.060 0.075 0.100
0.057 0.072 0.970
0.049 0.063 0.083
0.046 0.060 0.080
0.099 0.127 0.162
0.090 0.118 0.146
0.034 0.049 0.069
0.026 0.041 0.059
①,Length of pilot S nominal(mm):
When L<3.2, S=0.5 mm.
When 3.2≤L≤4, S=0.9 mm.
When 4.5≤L≤8, S=1.2 mm.
When 9.5≤L≤13, S=1.6 mm.
When 16≤L≤22, S=2 mm.
When L≥25,S=3.2 mm.

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