The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-455-8291, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-455-8291 |
| Primary Part Number | 42FLW720 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Washer Outside Diameter | 0.713 INCHES MINIMUM AND 0.763 INCHES MAXIMUM IN |
| Width Across Flats | 0.533 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416, TY I, CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hardness Rating | 40.0 ROCKWELL C MAXIMUM |
| Washer Thickness | 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6280 ASSN STD SINGLE MATERIAL RESPONSE OR MS 6300 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.4375 INCHES IN |
| Locking Feature | FREE-RUNNING ALL METAL DESIGN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| 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 |
|---|---|
| 42FLW720 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 9235390-13 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 5310-01-455-8291 is a Nut,self-Locking,extended Washer, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-455-8291 has 1 manufacturer part number on file: 42FLW720 (Sps Technologies, Llc Dba PB Fasteners).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-459-1198. Verify interchangeability with system specifications before substitution.
Key specifications for 42FLW720: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.496 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN; Washer Outside Diameter: 0.713 INCHES MINIMUM AND 0.763 INCHES MAXIMUM IN; Width Across Flats: 0.533 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN. 16 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.