THREAD SERIES DESIGNATOR | UNF |
NOMINAL THREAD DIAMETER | 0.440 INCHES |
THREAD QUANTITY PER INCH | 20 |
THREAD CLASS | 3A |
THREAD DIRECTION | RIGHT-HAND |
THREAD LENGTH | 0.345 INCHES MINIMUM AND |
| 0.355 INCHES MAXIMUM |
FASTENER LENGTH | 3.250 INCHES NOMINAL |
MATERIAL | STEEL COMP 4340 OVERALL |
MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-8844 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
SURFACE TREATMENT | CADMIUM HEAD |
| ENAMEL FASTENER |
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-83286 MIL SPEC SINGLE TREATMENT RESPONSE HEAD |
| CPT8204 FSCM 13002 MFR REF SINGLE TREATMENT RESPONSE FASTENER |
HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM OVERALL |
HEAD STYLE | DEE CHAMFER |
HEAD DIAMETER | 0.860 INCHES MINIMUM AND |
| 0.900 INCHES MAXIMUM |
HEAD HEIGHT | 0.310 INCHES MINIMUM AND |
| 0.340 INCHES MAXIMUM |
DISTANCE FROM CENTERLINE TO FLAT | 0.440 INCHES NOMINAL |
SHOULDER SHAPE | ROUND FIRST SHOULDER |
SHOULDER DIAMETER | 0.559 INCHES MINIMUM AND |
| 0.561 INCHES MAXIMUM FIRST SHOULDER |
SHOULDER LENGTH | 2.895 INCHES MINIMUM AND |
| 2.905 INCHES MAXIMUM FIRST SHOULDER |
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 3.110 INCHES NOMINAL FIRST HOLE |
SHANK UNTHREADED HOLE DIAMETER | 0.105 INCHES MINIMUM AND |
| 0.108 INCHES MAXIMUM FIRST HOLE |