The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-00-878-3291, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 20 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5310-00-878-3291 |
| Primary Part Number | 7550480-PL708782-55 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | CANCELLED |
| Lubrication | SOLUBLE LUBRICANT |
| Washer Outside Diameter | 0.244 INCHES MAXIMUM IN |
| Width Across Flats | 0.181 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-S-365 FED SPEC SINGLE TREATMENT RESPONSE OR AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNJC |
| Temp Rating | 800.0 FAHRENHEIT NOMINAL DEGF |
| Washer Thickness | 0.010 INCHES MINIMUM IN |
| Material Document and Classification | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.138 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | SILVER OVERALL |
| Precious Material and Location | EXTERNAL SURFACE SILVER |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 32 |
| Material | IRON ALLOY 660 OVERALL |
| Acquisition Status | CANCELLED |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 938.07.68.402 | Pilatus Aircraft Ltd (CHE) |
| MS21043-06 | Leonardo Spa Helicopters Division - Production Site (ITA) |
| ST.16126 | Bae Systems Asset Management (GBR) |
| 7550480-PL708782-55 PRIMARY | Naval Sea Systems Command (USA) |
| H41L06 | Satair A/s (DNK) |
| MN19-06 | Satair A/s (DNK) |
| MN19-06 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| Reference | Meaning |
|---|---|
| 10121786 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| MS21043-06 | 3/2 Design control — primary reference U.S. Government activity |
| 5310008783291 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 2523333 | 5/9 Secondary reference Honeywell International Inc Div Aerospace-South Bend (bendix Dr) |
| H41L06 | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Microdot Products |
| T99C632 | 5/9 Secondary reference Sps Technologies, Llc Dba Cherry Aerospace Div Div Cherry Aerospace |
| FN1014-632 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| MS21043-06 | 5/9 Secondary reference Freundlich Supply Company, Inc. |
| MS21043-06 | 5/9 Secondary reference Unison Industries Llc |
| MN19-06 | 5/9 Secondary reference Hi-Shear Corporation |
| 206419 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| H41L06 | 5/9 Secondary reference Tecnotec Sarl |
| 7383858-PL708782-55 | 3/1 Design control — primary reference Naval Sea Systems Command |
| P146007002 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 5310PL0685752 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| MS21043 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| MS21043-06 | 5/9 Secondary reference U.S. Government activity |
| 2523333 | 5/9 Secondary reference Unison Industries Llc |
| H41L06 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| T99C632 | 5/9 Secondary reference Republic Fastener Mfg. Corp. Use CAGE Code 52828 for Cataloging. |
NSN 5310-00-878-3291 is a Nut,self-Locking,extended Washer, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: cancelled.
NSN 5310-00-878-3291 has 7 manufacturer part numbers on file: 938.07.68.402 (Pilatus Aircraft Ltd), MS21043-06 (Leonardo Spa Helicopters Division - Production Site), ST.16126 (Bae Systems Asset Management), 7550480-PL708782-55 (Naval Sea Systems Command), H41L06 (Satair A/s) and 2 more.
5 possible matches (shared part number, not a government interchangeability claim): 3040-01-184-0486, 2530-01-187-1411, 5330-01-276-9611. Verify interchangeability with system specifications before substitution.
Key specifications for 7550480-PL708782-55: Lubrication: SOLUBLE LUBRICANT; Overall Height: 0.115 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN; Washer Outside Diameter: 0.244 INCHES MAXIMUM IN; Width Across Flats: 0.181 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN. 17 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.
NSN 5310-00-878-3291 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
NSN 5310-00-878-3291 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
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.