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Type IA cross recessed undercut oval countersunk head tapping screws - Type B and BP Thread Forming [Table 26]

ASME B 18.6.4 - 1998

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美标ASME B18.6.4 - 1998 ASME18.6.4 18.6.4A Type IA cross recessed undercut oval countersunk head tapping screws - Type B and BP Thread Forming [Table 26]
Nominal Diameter
d
0# 1# 2# 3# 4# 5# 6# 7#
d Nominal Size
L min
dk max
min
k Ref.
f Ref.
h max
min
M Ref.
t Ref.
N Ref.
Socket No.
Penetration depth max
min
0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510
1/8 5/32 3/16 7/32 1/4 1/4 5/16 3/8
0.112 0.137 0.162 0.187 0.212 0.237 0.262 0.287
0.096 0.120 0.144 0.167 0.191 0.215 0.238 0.262
0.025 0.031 0.036 0.042 0.047 0.053 0.059 0.064
0.021 0.025 0.029 0.033 0.037 0.041 0.045 0.049
0.046 0.056 0.065 0.075 0.084 0.094 0.104 0.113
0.033 0.042 0.050 0.059 0.067 0.076 0.084 0.093
0.068 0.070 0.106 0.118 0.130 0.152 0.172 0.176
0.040 0.043 0.065 0.077 0.089 0.080 0.100 0.105
0.018 0.018 0.029 0.030 0.030 0.041 0.041 0.041
0 0 1 1 1 2 2 2
0.040 0.043 0.062 0.074 0.086 0.074 0.093 0.099
0.024 0.027 0.046 0.058 0.070 0.056 0.075 0.081
Nominal Diameter
d
8# 10# 12# 1/4 5/16 3/8 7/16 1/2
d Nominal Size
L min
dk max
min
k Ref.
f Ref.
h max
min
M Ref.
t Ref.
N Ref.
Socket No.
Penetration depth max
min
0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.5000
7/16 1/2 9/16 5/8 5/8 5/8 3/4 3/4
0.312 0.362 0.412 0.477 0.597 0.717 0.760 0.815
0.285 0.333 0.380 0.442 0.556 0.670 0.715 0.765
0.070 0.081 0.092 0.107 0.134 0.161 0.156 0.156
0.052 0.060 0.068 0.079 0.099 0.117 0.122 0.131
0.123 0.142 0.161 0.186 0.232 0.278 0.279 0.288
0.101 0.118 0.135 0.158 0.198 0.239 0.239 0.244
0.186 0.202 0.264 0.284 0.374 0.394 0.404 0.416
0.115 0.132 0.148 0.168 0.223 0.243 0.253 0.265
0.041 0.041 0.056 0.057 0.086 0.086 0.086 0.086
2 2 3 3 4 4 4 4
0.108 0.125 0.135 0.155 0.205 0.225 0.235 0.247
0.090 0.107 0.117 0.137 0.187 0.207 0.217 0.229

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