Type 1 Cross Recessed Oval Countersunk Head Machine Screws - Coarse UNC

Standard ASME B18.6.3-2003
Description Type 1 Cross Recessed Oval Countersunk Head Machine Screw, ASME B18.6.3, No. 1 - 64 x 0.125
Part number ASME B18.6.3 - T1 CROCHMS - UNC - NS No. 1 x L 0.125 - TL 0.125
Product selection
Selector Nominal Size Basic Screw Diameter (inch) A Max. - Head Diameter (inch) A Min. - Head Diameter (inch) H Ref. - Head Side Height (inch) C Ref. - Head Crown Height (inch) O Ref. - Total Head Height (inch) M Ref. - Recess Diameter (inch) T Ref. - Recess Depth (inch) N Ref. - Recess Width (inch) Driver Size (inch) Recess Penetration Gaging Depth Max. (inch) Recess Penetration Gaging Depth Min. (inch) F Max. - Protrusion Above Gaging Diameter (inch) F Min. - Protrusion Above Gaging Diameter (inch) G - Gaging Diameter (inch)
1 No. 1 0.073 0.137 0.12 0.043 0.025 0.068 0.07 0.039 0.015 0 0.041 0.023 0.053 0.035 0.101
2 No. 2 0.086 0.162 0.144 0.051 0.029 0.08 0.106 0.06 0.018 1 0.062 0.045 0.058 0.039 0.124
3 No. 3 0.099 0.187 0.167 0.059 0.033 0.092 0.118 0.072 0.019 1 0.074 0.057 0.064 0.044 0.148
4 No. 4 0.112 0.212 0.191 0.067 0.037 0.104 0.13 0.086 0.019 1 0.087 0.07 0.069 0.048 0.172
5 No. 5 0.125 0.237 0.215 0.075 0.041 0.116 0.152 0.073 0.028 2 0.074 0.05 0.075 0.053 0.196
6 No. 6 0.138 0.262 0.238 0.083 0.045 0.128 0.172 0.092 0.03 2 0.094 0.069 0.08 0.057 0.22
7 No. 8 0.164 0.312 0.285 0.1 0.052 0.152 0.186 0.107 0.031 2 0.108 0.084 0.091 0.066 0.267
8 No. 10 0.19 0.362 0.333 0.116 0.06 0.176 0.202 0.125 0.033 2 0.126 0.102 0.102 0.075 0.313
9 No. 12 0.216 0.412 0.38 0.132 0.068 0.2 0.264 0.14 0.038 3 0.135 0.111 0.113 0.084 0.362
10 1/4 0.25 0.477 0.442 0.153 0.079 0.232 0.284 0.16 0.04 3 0.156 0.131 0.129 0.095 0.424
11 5/16 0.3125 0.597 0.556 0.191 0.099 0.29 0.384 0.226 0.065 4 0.218 0.194 0.155 0.117 0.539
12 3/8 0.375 0.717 0.67 0.23 0.117 0.347 0.404 0.245 0.068 4 0.237 0.213 0.182 0.139 0.653
13 7/16 0.4375 0.76 0.715 0.223 0.122 0.345 0.416 0.257 0.07 4 0.249 0.225 0.195 0.15 0.69
14 1/2 0.5 0.815 0.765 0.223 0.131 0.354 0.43 0.271 0.071 4 0.263 0.239 0.212 0.163 0.739
15 9/16 0.5625 0.932 0.878 0.26 0.15 0.41 0.462 0.304 0.075 4 0.296 0.272 0.239 0.184 0.851
16 5/8 0.625 1.05 0.99 0.298 0.169 0.467 0.58 0.34 0.081 5 0.323 0.291 0.266 0.206 0.962
17 3/4 0.75 1.285 1.215 0.372 0.206 0.578 0.642 0.406 0.088 5 0.388 0.357 0.318 0.251 1.186
Nominal Size
Basic Screw Diameter (inch)
A Max. - Head Diameter (inch)
A Min. - Head Diameter (inch)
H Ref. - Head Side Height (inch)
C Ref. - Head Crown Height (inch)
O Ref. - Total Head Height (inch)
M Ref. - Recess Diameter (inch)
T Ref. - Recess Depth (inch)
N Ref. - Recess Width (inch)
Driver Size (inch)
Recess Penetration Gaging Depth Max. (inch)
Recess Penetration Gaging Depth Min. (inch)
F Max. - Protrusion Above Gaging Diameter (inch)
F Min. - Protrusion Above Gaging Diameter (inch)
G - Gaging Diameter (inch)
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