The Washer,flat, cataloged under National Stock Number 5310-01-050-1522, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok. Government technical data includes 8 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 | 5310-01-050-1522 |
| Primary Part Number | 90698-4 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok |
| Status | ACTIVE |
| Overall Diameter | 0.324 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-N-281 CL A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | NICKEL ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.235 INCHES MINIMUM AND 0.239 INCHES MAXIMUM IN |
| Thickness | 0.0195 INCHES MINIMUM AND 0.0225 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 |
|---|---|
| 90698-4 PRIMARY | Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok (USA) |
NSN 5310-01-050-1522 is a Washer,flat, manufactured by Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-050-1522 has 1 manufacturer part number on file: 90698-4 (Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok).
1 possible match (shared part number, not a government interchangeability claim): 3010-01-616-5916. Verify interchangeability with system specifications before substitution.
Key specifications for 90698-4: Overall Diameter: 0.324 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN; Material Document and Classification: QQ-N-281 CL A FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 8 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.