BS 450 - 1958 Slotted 90° Raised-Countersunk Head Screws with B.S.W. & B.S.F. Threads [Table 2]


Unit: inch
Thread Size
d
1/8 3/16 7/32 1/4 5/16 3/8
d
PP No. of Threads/Inch B.S.W.
B.S.F.
dk ref
max
min
k max
f Nominal Size
n max
min
t Nominal Size
0.1250 0.1875 0.2188 0.2500 0.3125 0.3750
40 24 / 20 18 16
/ 32 28 26 22 20
0.237 0.356 0.415 0.475 0.594 0.712
0.219 0.328 0.383 0.438 0.547 0.656
0.201 0.307 0.36 0.412 0.518 0.624
0.056 0.084 0.098 0.113 0.141 0.169
0.026 0.040 0.044 0.051 0.068 0.080
0.039 0.050 0.055 0.061 0.071 0.082
0.032 0.042 0.046 0.051 0.061 0.072
0.047 0.071 0.083 0.095 0.120 0.144
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