The Washer,key, cataloged under National Stock Number 5310-00-103-2028, 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 12 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 | 5310-00-103-2028 |
| Primary Part Number | 448740 |
| 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 | 0.080 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.288 INCHES MINIMUM AND 0.293 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 1.060 INCHES MINIMUM AND 1.070 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Outside Diameter | 0.920 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN |
| Material Thickness | 0.043 INCHES MINIMUM AND 0.053 INCHES MAXIMUM IN |
| External Straight Key Width | 0.090 INCHES NOMINAL IN |
| External Key Quantity | 2 |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL OVERALL |
| Internal Key Quantity | 2 |
| Hole Diameter | 0.760 INCHES MINIMUM AND 0.780 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 |
|---|---|
| 448740 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
NSN 5310-00-103-2028 is a Washer,key, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-103-2028 has 1 manufacturer part number on file: 448740 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
1 possible match (shared part number, not a government interchangeability claim): 4720-00-834-0067. Verify interchangeability with system specifications before substitution.
Key specifications for 448740: Internal Straight Key Width: 0.080 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.288 INCHES MINIMUM AND 0.293 INCHES MAXIMUM IN; Overall Distance Including Keys: 1.060 INCHES MINIMUM AND 1.070 INCHES MAXIMUM IN; Style Designator: KEY. 12 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.