The Bolt,machine, cataloged under National Stock Number 5306-01-277-4979, 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20 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-277-4979 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.150 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN |
| Fastener Length | 1.210 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN |
| Thread Length | 0.750 INCHES MINIMUM IN |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM FASTENER |
| Material Document and Classification | SAE J429 GRADE 8 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A354 GRADE BD ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.425 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | 1 TYPE AND 8 GRADE |
| Locking Feature | PELLET THREADS |
| Surface Treatment | ZINC FASTENER |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 130000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 28 |
| Material | PLASTIC POLYAMIDE NYLON LOCKING FEATURE |
| Material | STEEL FASTENER |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 1/4-28UNFX1.25BOLT,STLZINCPLATED | 5/1 Secondary reference U.S. Government activity |
| MIL-DTL-1222 | 4/1 Identification reference U.S. Government activity |
| MILF18240 .250-28UNF-2AX1.250LG | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| MIL-S-1222 | 5/9 Secondary reference U.S. Government activity |
| M1222RN4F220GHLZX | 2/2 Government specification standardization U.S. Government activity |
NSN 5306-01-277-4979 is a Bolt,machine, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-277-4979: Head Height: 0.150 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN; Fastener Length: 1.210 INCHES MINIMUM AND 1.270 INCHES MAXIMUM IN; Thread Length: 0.750 INCHES MINIMUM IN; Hardness Rating: 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM FASTENER. 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.