The Washer,key, cataloged under National Stock Number 5310-01-200-7799, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-200-7799 |
| Primary Part Number | 2129J90-1 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| Status | ACTIVE |
| Overall Distance Including Keys | 2.620 INCHES NOMINAL IN |
| Style Designator | KEY |
| Material Document and Classification | MIL-S-861 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.980 INCHES NOMINAL IN |
| Material Thickness | 0.060 INCHES NOMINAL IN |
| Width Between Flats | 1.300 INCHES NOMINAL IN |
| External Key Quantity | 18 |
| Material | STEEL COMP 410 OVERALL |
| Hole Diameter | 1.560 INCHES NOMINAL 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 |
|---|---|
| 2129J90-1 PRIMARY | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| 2129J90-1 | 3/9 Design control — primary reference Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand Div Sgt Dresser-Rand |
| 2129J90 PIECE 1 | 5/9 Secondary reference General Electric Company |
NSN 5310-01-200-7799 is a Washer,key, manufactured by Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-200-7799 has 1 manufacturer part number on file: 2129J90-1 (Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions).
Key specifications for 2129J90-1: Overall Distance Including Keys: 2.620 INCHES NOMINAL IN; Style Designator: KEY; Material Document and Classification: MIL-S-861 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 1.980 INCHES NOMINAL 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.