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ASME B 18.2.1 - 2010 Lobed head screws [Table 9]


Unit:
Thread Size
d
1/4 5/16 3/8
PP UNC
dk Ref.
k max
min
h max
min
dc max
min
B max
Druve Size
ds max
min
b L≤6
L>6
r max
min
20 18 16
0.287 0.362 0.431
0.255 0.323 0.394
0.245 0.313 0.384
0.07 0.1 0.125
0.06 0.09 0.115
0.375 0.469 0.562
0.365 0.457 0.55
0.2073 0.2663 0.3103
E8 E10 E12
0.25 0.3125 0.375
0.245 0.3065 0.369
0.75 0.875 1
1 1.125 1.25
0.025 0.025 0.025
0.015 0.015 0.015
Alternative history ANSI/ASME B 18.2.1 - 2010 ANSI/ASME B 18.2.1 - 2012

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