The Washer,key, cataloged under National Stock Number 5310-00-766-4243, 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 18 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-766-4243 |
| Primary Part Number | 387330 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Surface Treatment Document and Classification | AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Distance From Centerline to Inside of Prebent Key | 0.537 INCHES MINIMUM AND 0.547 INCHES MAXIMUM IN |
| Split Key Length | 0.195 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN |
| External Prebent Key Length | 0.130 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 1.167 INCHES MINIMUM AND 1.207 INCHES MAXIMUM IN |
| Criticality Code Justification | FEAT |
| Style Designator | KEY |
| Material Document and Classification | AMS 5370 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.900 INCHES MINIMUM AND 0.920 INCHES MAXIMUM IN |
| External Tapered Key Width | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Material Thickness | 0.056 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN |
| External Key Quantity | 1 |
| External Prebent Key Angle | 20.0 DEGREES MINIMUM AND 40.0 DEGREES MAXIMUM |
| Surface Treatment | SILVER OVERALL |
| External Prebent Key Width | 0.140 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Material | STEEL COMP 304L OVERALL |
| Angle Between External Keys | 78.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM |
| Hole Diameter | 0.590 INCHES MINIMUM AND 0.600 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 | Y |
| Part Number | Manufacturer |
|---|---|
| 387330 | Alinabal Holdings Corporation Div Engineered Products Group (USA) |
| 387330 | Dcp Spring Acquisition Company, Inc. Dba New England Spring Div New England Spring (USA) |
| 387330 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 387330 | Parts Life Inc (USA) |
| Reference | Meaning |
|---|---|
| 387330 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
NSN 5310-00-766-4243 is a Washer,key, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-766-4243 has 4 manufacturer part numbers on file: 387330 (Alinabal Holdings Corporation Div Engineered Products Group), 387330 (Dcp Spring Acquisition Company, Inc. Dba New England Spring Div New England Spring), 387330 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 387330 (Parts Life Inc).
1 possible match (shared part number, not a government interchangeability claim): 6240-01-035-5294. Verify interchangeability with system specifications before substitution.
Key specifications for 387330: Surface Treatment Document and Classification: AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Distance From Centerline to Inside of Prebent Key: 0.537 INCHES MINIMUM AND 0.547 INCHES MAXIMUM IN; Split Key Length: 0.195 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN; External Prebent Key Length: 0.130 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN. 18 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.