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Unit:inch

82° Cross Recessed Countersunk Head Screws [Table 2] (ASTM F837, F468)

ASME B 18.6.3 (T2-I/T2-IA) - 2013

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美标ASME B18.6.3 (T2-I/T2-IA) - 2013 ASME1 82° Cross Recessed Countersunk Head Screws [Table 2] (ASTM F837, F468)
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Thread Size
d
0# 1# 2# 3# 4# 5# 6# 7# ③ 8# 10# 12# 14# ③
d Nominal Size
PP
dk max
min
k Ref
M1 Type I
M2 Type IA
P Type I Max.
Type I Min.
Type IA Max.
Type IA Min.
L ②
Socket No. Type I
Type IA
α Min.
Max.
0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510 0.1640 0.1900 0.2160 0.2420
/ 64 56 48 40 40 32 / 32 24 24 /
0.112 0.137 0.162 0.187 0.212 0.237 0.262 0.287 0.312 0.362 0.412 0.462
0.096 0.120 0.144 0.167 0.191 0.215 0.238 0.262 0.285 0.333 0.380 0.427
0.035 0.043 0.051 0.059 0.067 0.075 0.083 0.091 0.100 0.116 0.132 0.148
0.062 0.070 0.096 0.100 0.122 0.148 0.168 0.176 0.182 0.198 0.262 0.276
0.062 0.070 0.096 0.100 0.122 0.148 0.168 0.176 0.182 0.198 0.262 0.276
0.036 0.044 0.056 0.061 0.082 0.075 0.095 0.103 0.110 0.125 0.139 0.154
0.020 0.028 0.040 0.045 0.066 0.052 0.072 0.080 0.087 0.102 0.116 0.131
0.037 0.045 0.053 0.058 0.079 0.071 0.091 0.099 0.107 0.122 0.136 0.151
0.021 0.029 0.037 0.042 0.063 0.053 0.073 0.081 0.089 0.104 0.118 0.133
1/8 1/8 1/8 1/8 3/16 3/16 3/16 / 1/4 5/16 3/8 /
0 0 1 1 1 2 2 2 2 2 3 3
0 0 1 1 1 2 2 2 2 2 3 3
80° 80° 80° 80° 80° 80° 80° 80° 80° 80° 80° 80°
82° 82° 82° 82° 82° 82° 82° 82° 82° 82° 82° 82°
Thread Size
d
1/4 16# ③ 18# ③ 5/16 20# ③ 24# ③ 3/8 7/16 1/2 9/16 ④ 5/8 ④ 3/4 ④
d Nominal Size
PP
dk max
min
k Ref
M1 Type I
M2 Type IA
P Type I Max.
Type I Min.
Type IA Max.
Type IA Min.
L ②
Socket No. Type I
Type IA
α Min.
Max.
0.2500 0.2680 0.2940 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500
20 / / 18 / / 16 14 13 12 11 10
0.477 0.512 0.561 0.597 0.611 0.711 0.717 0.760 0.815 0.932 1.050 1.285
0.442 0.475 0.522 0.556 0.569 0.664 0.670 0.715 0.765 0.878 0.990 1.215
0.153 0.164 0.180 0.191 0.196 0.228 0.230 0.223 0.223 0.260 0.298 0.372
0.276 0.296 0.358 0.358 0.372 0.386 0.386 0.402 0.418 0.443 0.565 0.628
0.276 0.296 0.358 0.358 0.372 0.386 0.386 0.402 0.418 0.440 0.566 0.630
0.154 0.174 0.196 0.196 0.210 0.225 0.225 0.241 0.256 0.280 0,309 0.373
0.131 0.151 0.174 0.174 0.188 0.203 0.203 0.219 0.234 0.258 0,283 0.347
0.151 0.171 0.193 0.193 0.206 0.222 0.222 0.238 0.253 0.276 0.307 0.372
0.133 0.153 0.175 0.175 0.188 0.204 0.204 0.220 0.235 0.258 0.286 0.351
7/16 / / 1/2 / / 9/16 5/8 3/4 / / /
3 3 4 4 4 4 4 4 4 4 5 5
3 3 4 4 4 4 4 4 4 4 5 5
80° 80° 80° 80° 80° 80° 80° 80° 80° 80° 80° 80°
82° 82° 82° 82° 82° 82° 82° 82° 82° 82° 82° 82°
①,Edge of head may be rounded or flat.
②,Screws of these lengths and shorter shall have undercut heads.
③,7#, 14#, 16#, 18#, 20#, 24# are for tapping screws only.
④,9/16，5/8，and 3/4 for machine screws only.
⑤,Machine Screw Length of Thread 1) Sizes No.5 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 1-1/8 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full-form thread of 1 in. 2) Sizes No.6 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 2 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall have a minimum length of full-form thread of 1.5 in. unless otherwise specified.
⑥,Machine Screw Material
1)non-heat-treated low carbon steel, such as1006 through 1038
2)When hardened machine screw are specified, they shall be made from low or medium carbon steel, such as 1018 through 1038, with or without boron, through-hardened to Rockwell C25-38

Alternative history

ANSI/ASME B 18.6.3 - 2010 ASME B 18.6.3T2-I/T2-IA - 2013
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