ANSI/ASME B 18.6.3 - 2013 80° Dimensions of Slotted Flat Coutersunk head Tapping Screws


Unit: inch
Thread Size
d
0# 1# 2# 3# 4# 5# 6# 7# 8# 10# 12#
d Nominal Size
Series Symbol
L Type A & Type AB
Other Types
dk max
min
k Ref
n max
min
t max
min
0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510 0.1640 0.1900 0.2160
●◆▲ ●◆▲ ●◆▲■ ●◆▲■ ●◆▲■ ●◆▲■ ●◆▲■ ●◆▲ ●◆▲■ ●◆▲■ ●◆▲■
3/16 3/16 3/16 7/32 1/4 1/4 5/16 3/8 7/16 1/2 9/16
1/8 5/32 3/16 7/32 1/4 1/4 5/16 3/8 7/16 1/2 9/16
0.112 0.137 0.162 0.187 0.212 0.237 0.262 0.287 0.312 0.362 0.412
0.096 0.120 0.144 0.167 0.191 0.215 0.238 0.262 0.285 0.333 0.380
0.035 0.043 0.051 0.059 0.067 0.075 0.083 0.091 0.100 0.116 0.132
0.023 0.026 0.031 0.035 0.039 0.043 0.048 0.048 0.054 0.060 0.067
0.016 0.019 0.023 0.027 0.031 0.035 0.039 0.039 0.045 0.050 0.056
0.015 0.019 0.023 0.027 0.030 0.034 0.038 0.041 0.045 0.053 0.060
0.010 0.012 0.015 0.017 0.020 0.022 0.024 0.027 0.029 0.034 0.039
Thread Size
d
14# 1/4 16# 18# 5/16 20# 24# 3/8 7/16 1/2
d Nominal Size
Series Symbol
L Type A & Type AB
Other Types
dk max
min
k Ref
n max
min
t max
min
0.2420 0.2500 0.2680 0.2940 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000
●▲■ ●▲■ ▲■
5/8 5/8 3/4 13/16 13/16 13/16 1 / / /
/ 5/8 / / 5/8 / / 5/8 3/4 3/4
0.462 0.477 0.512 0.561 0.597 0.611 0.711 0.717 0.760 0.815
0.427 0.442 0.475 0.522 0.556 0.569 0.664 0.670 0.715 0.765
0.148 0.153 0.164 0.180 0.191 0.196 0.228 0.230 0.223 0.223
0.075 0.075 0.075 0.084 0.084 0.084 0.094 0.094 0.094 0.106
0.064 0.064 0.064 0.072 0.072 0.072 0.081 0.081 0.081 0.091
0.068 0.070 0.075 0.083 0.088 0.090 0.105 0.106 0.103 0.103
0.044 0.046 0.049 0.054 0.058 0.059 0.069 0.070 0.066 0.065
①,Edge of head may be rounded or flat.
②,Screws of these lengths and shorter shall have undercut heads. For tapping screws, use Type AB undercut head screws in place of Type A screws for these lengths and shorter.
③,Applicable to screw types as indicated below:
● Type AB thread-forming , see table [Table 40]
◆ Type A thread-forming, see table [Table 42]
▲ Type B and BP thread forming, see table [Table 41]; Type BF and BT thread cutting, see table [Table 43]
■ Type C thread forming, see table [Table VI-1]; Type D, F, G and T thread cutting, see table [Table 44]; and Type TRS thread-rolling ,see table [Table 45]
Alternative history
Similar Standards
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