The Washer,key, cataloged under National Stock Number 5310-00-071-0239, 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 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 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 | 5310-00-071-0239 |
| Primary Part Number | 431839 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Internal Straight Key Width | 0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.873 INCHES MINIMUM AND 0.889 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 1.200 INCHES MINIMUM AND 1.210 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | AMS 5521 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.004 INCHES MINIMUM AND 1.008 INCHES MAXIMUM IN |
| Material Thickness | 0.170 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| External Key Quantity | 6 |
| Material | STEEL COMP 310 OVERALL |
| Internal Key Quantity | 1 |
| Hole Diameter | 0.930 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5310-00-071-0239 is a Washer,key, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-071-0239 has 2 manufacturer part numbers on file: 431839 (Alinabal Holdings Corporation Div Engineered Products Group), 431839 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
1 possible match (shared part number, not a government interchangeability claim): 5999-00-870-7479. Verify interchangeability with system specifications before substitution.
Key specifications for 431839: Internal Straight Key Width: 0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.873 INCHES MINIMUM AND 0.889 INCHES MAXIMUM IN; Overall Distance Including Keys: 1.200 INCHES MINIMUM AND 1.210 INCHES MAXIMUM IN; Style Designator: KEY. 11 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.