The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-01-372-5676, 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 24 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-372-5676 |
| Primary Part Number | A51B61527-13 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Extended Washer Thickness | 0.100 INCHES NOMINAL IN |
| Head Height | 0.375 INCHES NOMINAL IN |
| Fastener Length | 5.312 INCHES NOMINAL IN |
| Extended Washer Diameter | 1.250 INCHES NOMINAL IN |
| Thread Length | 0.874 INCHES NOMINAL IN |
| Hole Configuration Style | ROUND PERPENDICULAR |
| Style Designator | COUNTERBORE UNTHREADED |
| Material Document and Classification | G-3111 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Counterbore Depth | 3.720 INCHES NOMINAL IN |
| Head Style | HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Counterbore Diameter | 0.624 INCHES MINIMUM AND 0.633 INCHES MAXIMUM IN |
| Width Between Flats | 1.000 INCHES NOMINAL IN |
| Shoulder Diameter | 0.872 INCHES MINIMUM AND 0.874 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.250 INCHES NOMINAL IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | TITANIUM ALLOY OVERALL |
| Hole Quantity | 2 |
| Shoulder Length | 4.438 INCHES NOMINAL IN |
| Thread Series Designator | UNF |
| Hole Type | DRILLED |
| Hole Diameter | 0.046 INCHES MINIMUM AND 0.056 INCHES MAXIMUM 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 |
|---|---|
| A51B61527-13 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| E5306000085703 | 5/9 Secondary reference U.S. Government activity |
| A51B61527-13 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation |
| A51B61527-13 | 5/9 Secondary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
NSN 5306-01-372-5676 is a Bolt,internally Relieved Body, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-372-5676 has 1 manufacturer part number on file: A51B61527-13 (Northrop Grumman Systems Corporation).
Key specifications for A51B61527-13: Extended Washer Thickness: 0.100 INCHES NOMINAL IN; Head Height: 0.375 INCHES NOMINAL IN; Fastener Length: 5.312 INCHES NOMINAL IN; Extended Washer Diameter: 1.250 INCHES NOMINAL IN. 24 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.