The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-00-008-8971, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems. Government technical data includes 22 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-00-008-8971 |
| Primary Part Number | A51M42537-11 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| Status | ACTIVE |
| Head Height | 0.188 INCHES NOMINAL IN |
| Fastener Length | 1.957 INCHES MINIMUM AND 1.967 INCHES MAXIMUM IN |
| Concentric Hole Depth | 1.480 INCHES NOMINAL IN |
| Thread Length | 0.334 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.110 INCHES MINIMUM AND 0.115 INCHES MAXIMUM FIRST HOLE IN |
| Style Designator | COUNTERBORE UNTHREADED |
| Material Document and Classification | G-1010,FSCM 26512 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Counterbore Depth | 0.110 INCHES NOMINAL IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Counterbore Diameter | 0.740 INCHES NOMINAL IN |
| Width Between Flats | 0.865 INCHES MINIMUM AND 0.877 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.7476 INCHES MINIMUM AND 0.7482 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.196 INCHES MINIMUM AND 0.201 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Shoulder Length | 1.519 INCHES MINIMUM AND 1.529 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.786 INCHES MINIMUM AND 1.796 INCHES MAXIMUM FIRST HOLE 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 |
|---|---|
| A51M42537-11 | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems (USA) |
| Reference | Meaning |
|---|---|
| A51M42537-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation |
| A51M42537-11 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
NSN 5306-00-008-8971 is a Bolt,internally Relieved Body, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-008-8971 has 1 manufacturer part number on file: A51M42537-11 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems).
Key specifications for A51M42537-11: Head Height: 0.188 INCHES NOMINAL IN; Fastener Length: 1.957 INCHES MINIMUM AND 1.967 INCHES MAXIMUM IN; Concentric Hole Depth: 1.480 INCHES NOMINAL IN; Thread Length: 0.334 INCHES MAXIMUM IN. 22 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.