8858B81: BOLT,INTERNALLY RELIEVED BODY.
The BOLT,INTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OVERALL, head_style: DEE CHAMFER, head_height: 0.250 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 1.940 INCHES NOMINAL IN, thread_length: 0.590 INCHES MINIMUM IN. This part is cataloged in the U.S.
Government catalog under NSN 5306-00-208-0663, 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 4140 OVERALL |
| head_style | DEE CHAMFER |
| head_height | 0.250 INCHES NOMINAL IN |
| thread_class | 3A A |
| head_diameter | 1.940 INCHES NOMINAL IN |
| thread_length | 0.590 INCHES MINIMUM IN |
| fastener_length | 3.560 INCHES NOMINAL IN |
| hardness_rating | 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| shoulder_length | 2.810 INCHES NOMINAL IN |
| style_designator | COUNTERBORE UNTHREADED |
| thread_direction | RIGHT-HAND |
| shoulder_diameter | 1.389 INCHES MINIMUM AND 1.394 INCHES MAXIMUM IN |
| NSN | 5306-00-208-0663 |
| HEAD HEIGHT | 0.250 INCHES NOMINAL IN |
| FASTENER LENGTH | 3.560 INCHES NOMINAL IN |
| DISTANCE FROM CENTERLINE TO FLAT | 0.800 INCHES MINIMUM AND 0.805 INCHES MAXIMUM IN |
| THREAD LENGTH | 0.590 INCHES MINIMUM IN |
| HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| SHANK UNTHREADED HOLE DIAMETER | 0.141 INCHES NOMINAL FIRST HOLE IN |
| STYLE DESIGNATOR | COUNTERBORE UNTHREADED |
| NOMINAL THREAD DIAMETER | 1.250 INCHES IN |
| HEAD STYLE | DEE CHAMFER |
| THREAD DIRECTION | RIGHT-HAND |
No substitute or cross-reference records for this part.