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


Unit: inch
Thread Size
d
1/8 3/16 7/32 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4
d
PP No. of Threads/Inch B.S.W.
B.S.F.
dk max
min
k max
min
n max
min
t Nominal Size
r Full shank max
R Reduced shank max
0.1250 0.1875 0.2188 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500
40 24 / 20 18 16 14 12 (12) 11 10
/ (32) (28) 26 22 20 18 16 (16) 14 12
0.245 0.373 0.425 0.492 0.615 0.740 0.863 0.987 1.031 1.125 1.250
0.231 0.357 0.407 0.473 0.594 0.716 0.838 0.958 0.999 1.090 1.209
0.075 0.110 0.125 0.144 0.178 0.212 0.247 0.281 0.315 0.350 0.419
0.065 0.099 0.112 0.130 0.162 0.195 0.227 0.260 0.293 0.325 0.390
0.039 0.050 0.055 0.061 0.071 0.082 0.093 0.104 0.115 0.126 0.148
0.032 0.042 0.046 0.051 0.061 0.072 0.082 0.092 0.103 0.113 0.134
0.040 0.061 0.069 0.078 0.095 0.112 0.129 0.145 0.162 0.179 0.213
0.010 0.015 0.015 0.031 0.031 0.031 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 0.050 0.055 0.060
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