The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-00-477-0513, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 12 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-477-0513 |
| Primary Part Number | 704344 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Washer Outside Diameter | 0.402 INCHES MINIMUM AND 0.412 INCHES MAXIMUM IN |
| Width Across Flats | 0.304 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Temp Rating | 450.0 FAHRENHEIT NOMINAL DEGF |
| Washer Thickness | 0.019 INCHES MINIMUM IN |
| Material Document and Classification | AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Style | HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 704344 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| FN1014M-428 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 704342 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| RMLH3858-048 | 5/9 Secondary reference Esna, Llc |
| 704343 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| 525-595-9106 | 5/9 Secondary reference U.S. Government activity |
| BH00205-4 | 5/9 Secondary reference Harig Mfg Corp |
| RMLH3858-048 | 5/9 Secondary reference Harvard Industries Inc |
| BH00205-4 | 5/9 Secondary reference Bristol Industries, Llc |
| 704345 | 5/9 Secondary reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| H42-4 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| 5310PL2037684 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 5310PL1673995 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 5310PL2203354 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| H51336-4 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
NSN 5310-00-477-0513 is a Nut,self-Locking,extended Washer, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-477-0513 has 3 manufacturer part numbers on file: 704344 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), FN1014M-428 (Sps Technologies, Llc Dba PB Fasteners), 704342 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
3 possible matches (shared part number, not a government interchangeability claim): 5310-00-894-3637, 5365-01-431-6856, 6110-01-535-9979. Verify interchangeability with system specifications before substitution.
Key specifications for 704344: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.205 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN; Washer Outside Diameter: 0.402 INCHES MINIMUM AND 0.412 INCHES MAXIMUM IN; Width Across Flats: 0.304 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN. 14 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.