Socket Head Cap Screw
| Thread Size d | 1/4 | 5/16 | 3/8 | 7/16 | 1/2 | |
| T. P. I. |
UNC-2A | 20 | 18 | 16 | 14 | 13 |
| UNF-2A | 28 | 24 | 24 | 20 | 20 | |
| BSW | 20 | 18 | 16 | 14 | 12 | |
| BSF | 26 | 22 | 20 | 18 | 16 | |
| Basic | 1.000 | 1.125 | 1.250 | 1.375 | 1.500 | |
| dk Max. | 0.375 | 0.437 | 0.562 | 0.625 | 0.750 | |
| ds Max. | 0.250 | 0.312 | 0.375 | 0.437 | 0.500 | |
| K Max. | 0.250 | 0.312 | 0.375 | 0.437 | 0.500 | |
| S Nom. | 3/16 | 7/32 | 5/16 | 5/16 | 3/8 | |
| t Min. | 0.120 | 0.151 | 0.182 | 0.213 | 0.245 | |
| W Min. | 0.095 | 0.119 | 0.143 | 0.166 | 0.190 | |
| r Max. | 0.014 | 0.017 | 0.020 | 0.023 | 0.026 | |
| ibf | 545 | 840 | 1300 | 2530 | 4400 | |
| Length | 1/2"- | 1/2"- | 1/2"- | 3/4"- | 3/4"- | |
| Range | 4" | 4" | 4" | 4" | 4" | |
| Nom. Thread DiameterM6 | M6 | M8 | M10 | M12 | M14 | M16 | |
| Thread Pitch | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | |
| Thread Lendth is min. | 24 | 28 | 32 | 36 | 40 | 44 | |
| Head Diameter dk | Max. | 10 | 13 | 16 | 18 | 21 | 24 |
| Min. | 9.78 | 12.73 | 15.73 | 17.73 | 20.67 | 23.67 | |
| Head Height k | Max. | 6 | 8 | 10 | 12 | 14 | 16 |
| Min. | 5.70 | 7.64 | 9.64 | 11.57 | 13.57 | 15.57 | |
| Nominal key size | 5 | 6 | 8 | 10 | 12 | 14 | |
| s | max. | 5.084 | 6.14 | 8.175 | 10.127 | 12.146 | 14.159 |
| min. | 5.02 | 6.02 | 8.025 | 10.025 | 12.032 | 14.032 | |
| Socket depth | 3 | 4 | 5 | 6 | 7 | 8 | |
| Radius under head | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | |
