The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-00-003-6543, 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 21 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-00-003-6543 |
| Primary Part Number | A51B24628-11 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Head Height | 0.125 INCHES NOMINAL IN |
| Fastener Length | 2.494 INCHES MINIMUM AND 2.499 INCHES MAXIMUM IN |
| Concentric Hole Depth | 1.674 INCHES MINIMUM AND 1.689 INCHES MAXIMUM IN |
| Thread Length | 0.610 INCHES MINIMUM IN |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE IN |
| Style Designator | CONCENTRIC HOLE UNTHREADED |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | ROUND W/WRENCH FLATS |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 1.250 INCHES NOMINAL IN |
| Shoulder Diameter | 0.8675 INCHES MINIMUM AND 0.8686 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.250 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Shoulder Length | 1.884 INCHES MINIMUM AND 1.889 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.297 INCHES MINIMUM AND 2.302 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 1.335 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 |
|---|---|
| A51B24628-11 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| A51B24628-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| A51B24628-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
NSN 5306-00-003-6543 is a Bolt,internally Relieved Body, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-003-6543 has 1 manufacturer part number on file: A51B24628-11 (Northrop Grumman Systems Corporation).
Key specifications for A51B24628-11: Head Height: 0.125 INCHES NOMINAL IN; Fastener Length: 2.494 INCHES MINIMUM AND 2.499 INCHES MAXIMUM IN; Concentric Hole Depth: 1.674 INCHES MINIMUM AND 1.689 INCHES MAXIMUM IN; Thread Length: 0.610 INCHES MINIMUM IN. 21 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.