The Washer,key, cataloged under National Stock Number 5310-01-015-4976, 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 6 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-015-4976 |
| Primary Part Number | 728540 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| External Prebent Key Length | 0.145 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.500 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| External Straight Key Width | 0.280 INCHES MINIMUM IN |
| External Prebent Key Width | 0.140 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN |
| Material | STEEL COMP 321 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 |
|---|---|
| 728540 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 728540 | Enjet Aero Manchester Llc (USA) |
| Reference | Meaning |
|---|---|
| 728540 | 5/9 Secondary reference U.S. Government activity |
| 728540 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
| 728540 | C/1 Advisory reference — outside the item-of-supply concept Nielsen Hardware Corporation |
NSN 5310-01-015-4976 is a Washer,key, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-015-4976 has 2 manufacturer part numbers on file: 728540 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 728540 (Enjet Aero Manchester Llc).
Key specifications for 728540: External Prebent Key Length: 0.145 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN; Material Document and Classification: AMS5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.500 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN; External Straight Key Width: 0.280 INCHES MINIMUM IN. 6 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.