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Undercut Oval 82-deg Countersunk Head Screws, Type I & Type IA Recess

ASME B 18.6.3 (T12-I/T12-IA) - 2013

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美标ASME B18.6.3 (T12-I/T12-IA) - 2013 ASM Undercut Oval 82-deg Countersunk Head Screws, Type I & Type IA Recess
Thread Size
d
0# 1# 2# 3# 4# 5# 6# 7# 8# 10# 12#
d
PP
Socket No.
M1 Ref.
M2 Ref.
P Type I max
min
Type IA max
min
dk max
min
k Ref.
f Ref.
α max
min
0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510 0.1640 0.1900 0.2160
80 64 56 48 40 40 32 / 32 24 24
0 0 1 1 1 2 2 2 2 2 3
0.068 0.070 0.106 0.118 0.130 0.152 0.172 0.176 0.186 0.202 0.264
0.068 0.070 0.106 0.118 0.130 0.152 0.172 0.176 0.186 0.202 0.264
0.038 0.041 0.062 0.074 0.087 0.074 0.094 0.100 0.108 0.126 0.135
0.020 0.023 0.045 0.057 0.070 0.050 0.069 0.075 0.084 0.102 0.111
0.040 0.043 0.062 0.074 0.086 0.074 0.093 0.099 0.108 0.125 0.135
0.024 0.027 0.046 0.058 0.070 0.056 0.075 0.081 0.090 0.107 0.117
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
0.025 0.031 0.036 0.042 0.047 0.053 0.059 0.064 0.070 0.081 0.092
0.021 0.025 0.029 0.033 0.037 0.041 0.045 0.049 0.052 0.060 0.068
82° 82° 82° 82° 82° 82° 82° 82° 82° 82° 82°
80° 80° 80° 80° 80° 80° 80° 80° 80° 80° 80°
Thread Size
d
14# 1/4 16# 18# 5/16 20# 24# 3/8 7/16 1/2
d
PP
Socket No.
M1 Ref.
M2 Ref.
P Type I max
min
Type IA max
min
dk max
min
k Ref.
f Ref.
α max
min
0.2420 0.2500 0.2680 0.2940 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000
/ 20 / / 18 / / 16 14 13
3 3 3 4 4 4 4 4 4 4
0.282 0.284 0.300 0.358 0.374 0.384 0.394 0.394 0.404 0.416
0.282 0.284 0.300 0.358 0.374 0.384 0.394 0.394 0.404 0.416
0.156 0.156 0.173 0.189 0.206 0.218 0.225 0.225 0.237 0.249
0.131 0.131 0.149 0.165 0.182 0.194 0.201 0.201 0.213 0.225
0.153 0.155 0.172 0.188 0.205 0.215 0.225 0.225 0.235 0.247
0.135 0.137 0.154 0.170 0.187 0.197 0.207 0.207 0.217 0.229
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
0.104 0.107 0.115 0.126 0.134 0.137 0.160 0.161 0.156 0.156
0.076 0.079 0.084 0.092 0.099 0.100 0.116 0.117 0.122 0.131
82° 82° 82° 82° 82° 82° 82° 82° 82° 82°
80° 80° 80° 80° 80° 80° 80° 80° 80° 80°
①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
②,Sizes 7 is for tapping screws only.

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