ANSI ASME B18.3

Hexagon socket head shoulder screws

tech-ansi-asme-b18-3-p355




For thread diameter 1/8 5/32 3/16
ds max 0.123 0.154 0.185
min 0.121 0.152 0.183
dk max 0.25 0.281 0.312
min 0.235 0.266 0.296
k max 0.125 0.125 0.156
min 0.115 0.115 0.146
s Nominal Size 0.078 0.094 0.094
t min 0.067 0.067 0.079
d Nominal Size 4 6 8
Nominal Diameter 0.112 0.138 0.164
PP Threads per in. 40 32 32
b thread length 0.157 0.187 0.189

For thread diameter 1/4 5/16 3/8
ds max 0.248 0.3105 0.373
min 0.246 0.3085 0.371
dk max 0.375 0.438 0.562
min 0.357 0.419 0.543
k max 0.188 0.219 0.25
min 0.177 0.209 0.24
s Nominal Size 0.125 0.156 0.188
t min 0.094 0.117 0.141
d Nominal Size 10 1/4 5/16
Nominal Diameter 0.19 0.25 0.3125
PP Threads per in. 24 20 18
b thread length 0.375 0.438 0.5

For thread diameter 1/2 5/8 3/4
ds max 0.498 0.623 0.748
min 0.496 0.621 0.746
dk max 0.75 0.875 1
min 0.729 0.853 0.977
k max 0.312 0.375 0.5
min 0.302 0.365 0.49
s Nominal Size 0.25 0.312 0.375
t min 0.188 0.234 0.281
d Nominal Size 3/8 1/2 5/8
Nominal Diameter 0.375 0.5 0.625
PP Threads per in. 16 13 11
b thread length 0.625 0.75 0.875

For thread diameter 1 1-1/4 1-1/2
ds max 0.998 1.248 1.498
min 0.996 1.246 1.496
dk max 1.312 1.75 2.125
min 1.287 1.723 2.095
k max 0.625 0.75 1
min 0.61 0.735 0.98
s Nominal Size 0.5 0.625 0.875
t min 0.375 0.469 0.656
d Nominal Size 3/4 7/8 1-1/8
Nominal Diameter 0.75 0.875 1.125
PP Threads per in. 10 9 7
b thread length 1 1.125 1.5

For thread diameter 1-3/4 2
ds max 1.748 1.998
min 1.746 1.996
dk max 2.375 2.75
min 2.345 2.72
k max 1.125 1.25
min 1.105 1.23
s Nominal Size 1 1.25
t min 0.75 0.937
d Nominal Size 1-1/4 1-1/2
Nominal Diameter 1.25 1.5
PP Threads per in. 7 6
b thread length 1.75 2



All information is strictly informative