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BS 1981-5-1991

80° Countersunk flat head screws with type Z cross recess-Table 5

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BS 1981-5-1991

80° Countersunk flat head screws with type Z cross recess-Table 5

Nom
P
dk max
dk min
k
t max
t min
M
No.
#2
56|64
0.172
0.147
0.051
0.053
0.043
0.094
1
#3
48|56
0.199
0.171
0.059
0.058
0.048
0.099
1
#4
40|48
0.225
0.195
0.067
0.079
0.069
0.12
1
#5
40|44
0.252
0.22
0.075
0.071
0.053
0.146
2
#6
32|40
0.279
0.244
0.083
0.091
0.073
0.166
2
#8
32|36
0.332
0.292
0.1
0.107
0.089
0.181
2
#10
24|32
0.385
0.34
0.116
0.122
0.104
0.196
2
#12
24|28|32
0.438
0.389
0.132
0.125
0.107
0.25
3
1/4
20|28|32
0.507
0.452
0.153
0.151
0.133
0.275
3
5/16
18|24|32
0.635
0.568
0.191
0.193
0.175
0.357
4
3/8
16|24|32
0.762
0.685
0.23
0.222
0.204
0.385
4
7/16
14|20|28
0.812
0.723
0.223
0.238
0.22
0.401
4
1/2
13|20|28
0.875
0.775
0.223
0.253
0.235
0.416
4
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