BS 450 - 1958 Cross Recessed Pan Head Screws with B.S.W. & B.S.F. Threads [Table 5]


Unit: inch
英标BS 450 - 1958 BS450 450BS Cross Recessed Pan Head Screws with B.S.W. & B.S.F. Threads [Table 5]
Thread Size
d
1/8 3/16 7/32 1/4 5/16 3/8 7/16 1/2
d
PP No. of Threads/Inch B.S.W.
B.S.F.
dk max
min
k max
min
r Full shank max
R Reduced shank max
Socket No.
M Nominal Size
t max
min
0.1250 0.1875 0.2188 0.2500 0.3125 0.3750 0.4375 0.5000
40 24 / 20 18 16 14 12
/ (32) (28) 26 22 20 18 16
0.245 0.373 0.425 0.492 0.615 0.74 0.863 0.987
0.231 0.357 0.407 0.473 0.594 0.716 0.838 0.958
0.075 0.11 0.125 0.144 0.178 0.212 0.247 0.281
0.065 0.099 0.112 0.13 0.162 0.195 0.227 0.26
0.010 0.015 0.015 0.031 0.031 0.031 0.031 0.031
0.020 0.025 0.025 0.040 0.045 0.045 0.050 0.050
2 2 3 3 4 4 4 4
0.146 0.184 0.242 0.266 0.333 0.371 0.392 0.413
0.084 0.122 0.135 0.160 0.191 0.230 0.252 0.274
0.066 0.104 0.117 0.142 0.173 0.212 0.234 0.256
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