The Bolt,machine, cataloged under National Stock Number 5306-00-487-2514, 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 19 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-00-487-2514 |
| Primary Part Number | 3M261-5D21 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Fastener Length | 1.783 INCHES MINIMUM AND 1.810 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MAC PS13145,MCDONNELL DOUGLAS CORP MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.467 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | 76301-23-105,TYPE 1 A MFR REF SINGLE MATERIAL RESPONSE OVERALL A |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Features Provided | UNFINISHED HEAD |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN |
| Width Between Flats | 0.561 INCHES MINIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 11050 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.669 INCHES MINIMUM AND 1.686 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 |
|---|---|
| 3M261-5D21 | Huck International, Inc (USA) |
| 3M261-5D21 PRIMARY | The Boeing Company Div Defense (USA) |
| AIC261M5D21 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3M261-5D21 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 3M261-5D21 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-00-487-2514 is a Bolt,machine, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-487-2514 has 4 manufacturer part numbers on file: 3M261-5D21 (Huck International, Inc), 3M261-5D21 (The Boeing Company Div Defense), AIC261M5D21 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 3M261-5D21 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 3M261-5D21: Head Height: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN; Fastener Length: 1.783 INCHES MINIMUM AND 1.810 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MAC PS13145,MCDONNELL DOUGLAS CORP MFR REF SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.467 INCHES NOMINAL IN. 19 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.