The Washer,key, cataloged under National Stock Number 5310-01-528-0326, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-528-0326 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Internal Straight Key Width | 0.070 INCHES MINIMUM AND 0.076 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.280 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-L-8937 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Style Designator | KEY |
| Material Document and Classification | QQ-C-533, ALLOY 172, TEMPER H FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.730 INCHES MINIMUM AND 0.735 INCHES MAXIMUM IN |
| Material Thickness | 0.035 INCHES MINIMUM AND 0.039 INCHES MAXIMUM IN |
| Surface Treatment | DISULFIDE MOLYBDENUM OVERALL |
| Material | COPPER ALLOY 172 OVERALL |
| Internal Key Quantity | 1 |
| Hole Diameter | 0.627 INCHES MINIMUM AND 0.631 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 |
| Reference | Meaning |
|---|---|
| 200-1003-235 | 3/2 Design control — primary reference U.S. Government activity |
| 200-1003-235 | 3/9 Design control — primary reference Cooper Interconnect, Inc. Div Interconnect |
| 200-1003-235 | 5/9 Secondary reference Amphenol Corp Div Amphenol Aerospace Operations |
NSN 5310-01-528-0326 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-528-0326: Internal Straight Key Width: 0.070 INCHES MINIMUM AND 0.076 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.280 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-L-8937 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Style Designator: KEY. 11 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.