| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| THREAD QUANTITY PER INCH | 16 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.595 INCHES MINIMUM AND |
| 0.625 INCHES MAXIMUM |
| FASTENER LENGTH | 1.600 INCHES MINIMUM AND |
| 1.620 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 4037 OR |
| STEEL COMP 4137 OR |
| STEEL COMP 4140 OR |
| STEEL COMP 8630 OR |
| STEEL COMP 8740 OVERALL |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 32.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 140000 POUNDS PER SQUARE INCH |
| HEAD STYLE | FLAT CHAMFER |
| HEAD DIAMETER | 0.729 INCHES MINIMUM AND |
| 0.750 INCHES MAXIMUM |
| HEAD HEIGHT | 0.302 INCHES MINIMUM AND |
| 0.312 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.250 INCHES NOMINAL |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| SHOULDER DIAMETER | 0.496 INCHES MINIMUM AND |
| 0.498 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 0.995 INCHES MINIMUM AND |
| 1.005 INCHES MAXIMUM FIRST SHOULDER |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW,SHOULDER - SOCKET HEAD, HEXAGON |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81349 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MS51975M29 |