The Bolt,machine, cataloged under National Stock Number 5306-00-379-3549, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-379-3549 |
| Primary Part Number | A51B25570-11 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Extended Washer Thickness | 0.100 INCHES NOMINAL IN |
| Head Height | 0.300 INCHES NOMINAL IN |
| Fastener Length | 1.700 INCHES NOMINAL IN |
| Extended Washer Diameter | 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN |
| Thread Length | 0.840 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| 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 |
| Part Number | Manufacturer |
|---|---|
| A51B25570-11 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| A51B25570-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51B25570-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 5306-00-379-3549 is a Bolt,machine, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-379-3549 has 1 manufacturer part number on file: A51B25570-11 (Northrop Grumman Systems Corporation).
Key specifications for A51B25570-11: Extended Washer Thickness: 0.100 INCHES NOMINAL IN; Head Height: 0.300 INCHES NOMINAL IN; Fastener Length: 1.700 INCHES NOMINAL IN; Extended Washer Diameter: 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN. 13 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.