The Washer,flat, cataloged under National Stock Number 5310-00-392-6983, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hickok Waekon Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-392-6983 |
| Primary Part Number | 7090-4 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hickok Waekon Llc |
| Status | ACTIVE |
| Overall Diameter | 0.312 INCHES NOMINAL IN |
| Material Document and Classification | F-10001,FSCM 83616 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | PLASTIC POLYAMIDE NYLON OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.189 INCHES MINIMUM AND 0.194 INCHES MAXIMUM IN |
| Thickness | 0.031 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 |
| Part Number | Manufacturer |
|---|---|
| 7090-4 PRIMARY | Hickok Waekon Llc (USA) |
| Reference | Meaning |
|---|---|
| 3191016-001-1 | C/1 Advisory reference — outside the item-of-supply concept Lockheed Martin Corporation Dba Lockheed Martin Div Rotary and Mission Systems |
NSN 5310-00-392-6983 is a Washer,flat, manufactured by Hickok Waekon Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-392-6983 has 1 manufacturer part number on file: 7090-4 (Hickok Waekon Llc).
2 possible matches (shared part number, not a government interchangeability claim): 5306-00-568-0271, 5110-01-695-0494. Verify interchangeability with system specifications before substitution.
Key specifications for 7090-4: Overall Diameter: 0.312 INCHES NOMINAL IN; Material Document and Classification: F-10001,FSCM 83616 MFR REF 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.