The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-01-121-1656, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 20 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-121-1656 |
| Primary Part Number | 74A410640-2001 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.093 INCHES NOMINAL IN |
| Fastener Length | 1.750 INCHES NOMINAL IN |
| Distance From Centerline to Flat | 0.435 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Thread Length | 0.300 INCHES NOMINAL IN |
| Criticality Code Justification | AASY |
| Style Designator | COUNTERBORE UNTHREADED |
| Material Document and Classification | MIL-S-8844,CLASS 3,COND E2 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Counterbore Depth | 1.558 INCHES NOMINAL IN |
| Head Style | DEE |
| Thread Direction | RIGHT-HAND |
| Counterbore Diameter | 0.438 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.406 INCHES MINIMUM AND 0.413 INCHES MAXIMUM IN |
| Surface Treatment | CHROMATE OVERALL |
| Minimum Tensile Strength | 280000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 1.000 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 | F |
| Part Number | Manufacturer |
|---|---|
| 74A410640-2001 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 10115763 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5306-01-121-1656 is a Bolt,internally Relieved Body, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-121-1656 has 1 manufacturer part number on file: 74A410640-2001 (The Boeing Company Div Defense).
Key specifications for 74A410640-2001: Head Height: 0.093 INCHES NOMINAL IN; Fastener Length: 1.750 INCHES NOMINAL IN; Distance From Centerline to Flat: 0.435 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN; Thread Length: 0.300 INCHES NOMINAL IN. 20 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.