| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL |
| FASTENER LENGTH | 0.949 INCHES MINIMUM AND 0.979 INCHES MAXIMUM |
| HEAD DIAMETER | 0.531 INCHES NOMINAL |
| HEAD STYLE | FLAT COUNTERSUNK |
| INTERNAL THREAD CLASS | 3B CONCENTRIC HOLE |
| INTERNAL THREAD DIRECTION | RIGHT-HAND CONCENTRIC HOLE |
| INTERNAL THREAD LENGTH | 0.343 INCHES MINIMUM AND 0.413 INCHES MAXIMUM CONCENTRIC HOLE |
| MATERIAL | STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150 OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| NOMINAL THREAD SIZE | 0.250 INCHES CONCENTRIC HOLE |
| SPECIAL FEATURES | TORQUE SLOT IN HEAD 0.080 INCH MIN,0.084 INCH MAX DIA |
| STYLE DESIGNATOR | CONCENTRIC HOLE THREADED |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.357 INCHES MINIMUM AND 0.407 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |
| THREAD SERIES | UNIFIED NATIONAL JOINT FINE (UNJF) CONCENTRIC HOLE |
| THREAD QUANTITY PER INCH | 28 |
| THREADS PER INCH | 28 CONCENTRIC HOLE |