The Washer,key, cataloged under National Stock Number 5310-00-403-3478, 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 9 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 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 | 5310-00-403-3478 |
| Primary Part Number | 655164 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Overall Distance Including Keys | 4.930 INCHES MINIMUM AND 4.950 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | AMS5040 ASSN STD ALL MATERIAL RESPONSES OR AMS5042 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Outside Diameter | 4.630 INCHES MINIMUM AND 4.650 INCHES MAXIMUM IN |
| Material Thickness | 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN |
| External Straight Key Width | 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN |
| External Key Quantity | 6 |
| Material | STEEL OVERALL |
| Hole Diameter | 4.320 INCHES MINIMUM AND 4.340 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 |
| Part Number | Manufacturer |
|---|---|
| 655164 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
NSN 5310-00-403-3478 is a Washer,key, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-403-3478 has 1 manufacturer part number on file: 655164 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
1 possible match (shared part number, not a government interchangeability claim): 5961-00-501-1876. Verify interchangeability with system specifications before substitution.
Key specifications for 655164: Overall Distance Including Keys: 4.930 INCHES MINIMUM AND 4.950 INCHES MAXIMUM IN; Style Designator: KEY; Material Document and Classification: AMS5040 ASSN STD ALL MATERIAL RESPONSES OR AMS5042 ASSN STD ALL MATERIAL RESPONSES OVERALL; Outside Diameter: 4.630 INCHES MINIMUM AND 4.650 INCHES MAXIMUM IN. 9 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.