The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-00-006-0509, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-006-0509 |
| Primary Part Number | A51B24668-11 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Head Height | 0.140 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Fastener Length | 3.928 INCHES MINIMUM AND 3.933 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | -1L0C-8837 TY 2 CL 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Concentric Hole Depth | 3.018 INCHES MINIMUM AND 3.033 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 |
| Material Document and Classification | G-1010 C0MP 4330V FSCM 26512 MFR REF SINGLE MATERIAL RESPONSE OVERALL V |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | ROUND W/WRENCH FLATS |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 1.625 INCHES NOMINAL IN |
| Shoulder Diameter | 1.1175 INCHES MINIMUM AND 1.1186 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.499 INCHES MINIMUM AND 0.506 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Test Data Document | 81349-MIL-I-6868 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Shoulder Length | 3.318 INCHES MINIMUM AND 3.323 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 3.731 INCHES MINIMUM AND 3.736 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 1.710 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 |
|---|---|
| A51B24668-11 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| A51B24668-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51B24668-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation |
NSN 5306-00-006-0509 is a Bolt,internally Relieved Body, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-006-0509 has 1 manufacturer part number on file: A51B24668-11 (Northrop Grumman Systems Corporation).
Key specifications for A51B24668-11: Head Height: 0.140 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN; Fastener Length: 3.928 INCHES MINIMUM AND 3.933 INCHES MAXIMUM IN; Surface Treatment Document and Classification: -1L0C-8837 TY 2 CL 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Concentric Hole Depth: 3.018 INCHES MINIMUM AND 3.033 INCHES MAXIMUM 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.