The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-337-7031, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-337-7031 |
| Primary Part Number | BACN10YR4CD |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Washer Outside Diameter | 0.420 INCHES MAXIMUM IN |
| Width Across Flats | 0.304 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNF |
| Temp Rating | 450.0 FAHRENHEIT NOMINAL DEGF |
| Washer Thickness | 0.019 INCHES MINIMUM IN |
| Material Document and Classification | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Specification/standard Data | 81205-BACN10YR MANUFACTURERS STANDARD |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 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 |
|---|---|
| BACN10YR4CD | Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems (USA) |
| BACN10YR4CD | Boeing Defence Australia Ltd Div Defense, Space & Security (AUS) |
| BACN10YR4CD | Boeing Defence Australia Ltd (AUS) |
| BACN10YR4CD | Howmet Global Fastening Systems Inc (USA) |
| BACN10YR4CD | Bristol Industries, Llc (USA) |
| BACN10YR4CD | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| BH00312-4 | 5/9 Secondary reference Bristol Industries, Llc |
| BRH30C-4 | 5/9 Secondary reference Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems |
| LH3858-4 | 5/9 Secondary reference Harvard Industries Inc |
| 5310PL1991611 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| PLH54CD | 5/2 Secondary reference U.S. Government activity |
| T6113C-428 | 5/9 Secondary reference Sps Technologies, Llc Dba Cherry Aerospace Div Div Cherry Aerospace |
| BACN10YR4CD | 3/2 Design control — primary reference U.S. Government activity |
| H52732-4 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| 80724-428 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
NSN 5310-01-337-7031 is a Nut,self-Locking,extended Washer, manufactured by Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-337-7031 has 6 manufacturer part numbers on file: BACN10YR4CD (Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems), BACN10YR4CD (Boeing Defence Australia Ltd Div Defense, Space & Security), BACN10YR4CD (Boeing Defence Australia Ltd), BACN10YR4CD (Howmet Global Fastening Systems Inc), BACN10YR4CD (Bristol Industries, Llc) and 1 more.
1 possible match (shared part number, not a government interchangeability claim): 5310-01-669-6907. Verify interchangeability with system specifications before substitution.
Key specifications for BACN10YR4CD: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.204 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN; Washer Outside Diameter: 0.420 INCHES MAXIMUM IN; Width Across Flats: 0.304 INCHES MINIMUM AND 0.316 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.
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.