Type 1A Cross Recessed Flat Countersunk Trim Head Machine Screws - Coarse UNC

Standard ASME B18.6.3-2003
Description Type 1A Cross Recessed Flat Countersunk Trim Head Machine Screw, ASME B18.6.3, No. 4 - 40 x 0.125
Part number ASME B18.6.3 - T1A CRFCTHMS - UNC - NS No. 4 x L 0.125 - TL 0.125 - HS No. 3
Product selection
Selector Nominal Size Basic Screw Diameter (inch) Head Size E Max. - Shoulder Diameter (inch) E Min. - Shoulder Diameter (inch) A Max. - Head Diameter (inch) A Min. - Head Diameter (inch) H Ref. - Head Height (inch) M Ref. - Recess Diameter (inch) T Ref. - Recess Depth (inch) N Ref. - Recess Width (inch) Driver Size 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. 4 0.112 No. 3 0.112 0.106 0.187 0.167 0.052 0.1 0.06 0.029 1 0.058 0.042 0.031 0.018 0.148
2 No. 5 0.125 No. 4 0.125 0.119 0.212 0.191 0.06 0.122 0.081 0.03 1 0.079 0.063 0.032 0.019 0.172
3 No. 6 0.138 No. 4 0.138 0.131 0.212 0.191 0.052 0.122 0.081 0.03 1 0.079 0.063 0.032 0.019 0.172
12 No. 6 0.138 No. 5 0.138 0.131 0.237 0.215 0.068 0.148 0.077 0.041 2 0.071 0.053 0.034 0.02 0.196
4 No. 8 0.164 No. 5 0.164 0.157 0.237 0.215 0.052 0.158 0.088 0.041 2 0.081 0.063 0.034 0.02 0.196
10 No. 8 0.164 No. 6 0.164 0.157 0.262 0.238 0.069 0.176 0.105 0.041 2 0.099 0.081 0.036 0.021 0.22
5 No. 10 0.19 No. 8 0.19 0.181 0.312 0.285 0.085 0.182 0.112 0.041 2 0.107 0.089 0.039 0.023 0.267
6 No. 12 0.216 No. 8 0.216 0.207 0.312 0.285 0.069 0.192 0.122 0.041 2 0.117 0.099 0.039 0.023 0.267
11 No. 12 0.216 No. 10 0.216 0.207 0.362 0.333 0.101 0.198 0.127 0.041 2 0.122 0.104 0.042 0.025 0.313
7 1/4 0.25 No. 10 0.25 0.24 0.362 0.333 0.08 0.198 0.127 0.041 2 0.122 0.104 0.042 0.025 0.313
13 1/4 0.25 No. 12 0.25 0.24 0.412 0.38 0.112 0.262 0.149 0.056 3 0.136 0.118 0.045 0.027 0.362
8 5/16 0.3125 No. 12 0.312 0.302 0.412 0.38 0.075 0.262 0.149 0.056 3 0.136 0.118 0.045 0.027 0.362
14 5/16 0.3125 1/4 0.312 0.302 0.477 0.442 0.116 0.276 0.164 0.057 3 0.151 0.133 0.05 0.029 0.424
9 3/8 0.375 5/16 0.375 0.364 0.597 0.556 0.155 0.358 0.211 0.086 4 0.193 0.175 0.057 0.034 0.539
Nominal Size
Basic Screw Diameter (inch)
Head Size
E Max. - Shoulder Diameter (inch)
E Min. - Shoulder Diameter (inch)
A Max. - Head Diameter (inch)
A Min. - Head Diameter (inch)
H Ref. - Head Height (inch)
M Ref. - Recess Diameter (inch)
T Ref. - Recess Depth (inch)
N Ref. - Recess Width (inch)
Driver Size
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)
0.125