The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-00-003-9029, 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 23 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-00-003-9029 |
| Primary Part Number | A51H40524-13 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Head Height | 0.156 INCHES NOMINAL IN |
| Fastener Length | 2.416 INCHES MINIMUM AND 2.426 INCHES MAXIMUM IN |
| Concentric Hole Depth | 1.810 INCHES NOMINAL IN |
| Thread Length | 0.333 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE IN |
| Style Designator | CONCENTRIC HOLE UNTHREADED |
| Material Document and Classification | G-1010 FSCM 26512 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | ROUND W/WRENCH FLATS |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.678 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.623 INCHES MINIMUM AND 0.624 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.311 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM THREADS |
| Surface Treatment | CHROMIUM GRIP |
| Surface Treatment | CADMIUM HEAD |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Shoulder Length | 1.979 INCHES MINIMUM AND 1.989 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.224 INCHES MINIMUM AND 2.234 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 0.800 INCHES NOMINAL IN |
| 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 |
|---|---|
| A51H40524-13 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| A51H40524-13 | 5/9 Secondary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51H40524-13 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation |
NSN 5306-00-003-9029 is a Bolt,internally Relieved Body, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-003-9029 has 1 manufacturer part number on file: A51H40524-13 (Northrop Grumman Systems Corporation).
Key specifications for A51H40524-13: Head Height: 0.156 INCHES NOMINAL IN; Fastener Length: 2.416 INCHES MINIMUM AND 2.426 INCHES MAXIMUM IN; Concentric Hole Depth: 1.810 INCHES NOMINAL IN; Thread Length: 0.333 INCHES MAXIMUM IN. 23 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.