The Bolt,ring, cataloged under National Stock Number 5306-01-277-4975, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-277-4975 |
| Item Name | Bolt,ring |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Ring Stock Diameter | 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Eye Stock Diameter | 0.562 INCHES MINIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416 TY 2 CL 3 FED SPEC 1ST TREATMENT RESPONSE OR ASTM B633 TY 2 CL 3 ASSN STD 2ND TREATMENT RESPONSE OVERALL |
| Thread Length | 0.622 INCHES MINIMUM AND 0.642 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN |
| Shank Length | 1.132 INCHES NOMINAL IN |
| Style Designator | SWIVEL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1251 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Shoulder Diameter | 0.368 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN |
| Distance From Threaded End to Shank Hole Center | 0.171 INCHES MINIMUM AND 0.191 INCHES MAXIMUM FIRST HOLE IN |
| Surface Treatment | CADMIUM AND CHROMATE OR ZINC AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8735 OR STEEL COMP 8740 OR STEEL COMP 6150 OVERALL |
| Shoulder Length | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| NAS1251 | 3/1 Design control — primary reference U.S. Government activity |
| NAS1251-2D8 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-277-4975 is a Bolt,ring, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-277-4975: Ring Stock Diameter: 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN; Eye Stock Diameter: 0.562 INCHES MINIMUM IN; Surface Treatment Document and Classification: QQ-P-416 TY 2 CL 3 FED SPEC 1ST TREATMENT RESPONSE OR ASTM B633 TY 2 CL 3 ASSN STD 2ND TREATMENT RESPONSE OVERALL; Thread Length: 0.622 INCHES MINIMUM AND 0.642 INCHES MAXIMUM IN. 20 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.