21185 FIND 55: BOLT,INTERNAL WRENCHING.
The BOLT,INTERNAL WRENCHING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OVERALL, hole_type: DRILLED, head_style: BEVEL-CONICAL, head_height: 0.250 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN. This part is cataloged in the U.S.
Government catalog under NSN 5306-01-416-5388, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.
Verify compatibility with your specific system configuration before ordering.
| material | STEEL COMP 4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OVERALL |
| hole_type | DRILLED |
| head_style | BEVEL-CONICAL |
| head_height | 0.250 INCHES NOMINAL IN |
| thread_class | 3A A |
| head_diameter | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| hole_diameter | 0.037 INCHES MINIMUM AND 0.042 INCHES MAXIMUM IN |
| hole_quantity | 4 |
| thread_length | 0.475 INCHES MINIMUM IN |
| fastener_length | 1.562 INCHES NOMINAL IN |
| hardness_rating | 34.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| thread_direction | RIGHT-HAND |
| NSN | 5306-01-416-5388 |
| WIDTH ACROSS FLATS | 0.037 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| HEAD HEIGHT | 0.250 INCHES NOMINAL IN |
| FASTENER LENGTH | 1.562 INCHES NOMINAL IN |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, TYPE 2, CLASS 2 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| THREAD LENGTH | 0.475 INCHES MINIMUM IN |
| HARDNESS RATING | 34.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| HOLE CONFIGURATION STYLE | ROUND INTERNAL HEXAGON |
| NOMINAL THREAD DIAMETER | 0.250 INCHES IN |
| HEAD STYLE | BEVEL-CONICAL |
| THREAD DIRECTION | RIGHT-HAND |
No substitute or cross-reference records for this part.