The Washer,key, cataloged under National Stock Number 5310-01-055-7770, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-055-7770 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Internal Straight Key Width | 0.205 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 1.405 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Distance Including Keys | 2.810 INCHES NOMINAL IN |
| Style Designator | KEY |
| Material Document and Classification | AMS 5516 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 2.620 INCHES NOMINAL IN |
| Material Thickness | 0.034 INCHES MINIMUM AND 0.038 INCHES MAXIMUM IN |
| External Straight Key Width | 0.880 INCHES NOMINAL IN |
| External Key Quantity | 2 |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 302 OVERALL |
| Internal Key Quantity | 2 |
| Hole Diameter | 2.200 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 |
| Reference | Meaning |
|---|---|
| 1211178-132 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-055-7770 is a Washer,key, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-055-7770: Internal Straight Key Width: 0.205 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 1.405 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Distance Including Keys: 2.810 INCHES NOMINAL IN. 14 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.