The Washer,lock, cataloged under National Stock Number 5310-01-189-4591, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-189-4591 |
| Primary Part Number | HS7020C6 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 11.8 MILLIMETERS NOMINAL MM |
| Material Thickness | 1.6 MILLIMETERS NOMINAL MM |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL CORROSION RESISTING OVERALL |
| Hole Diameter | 6.1 MILLIMETERS MINIMUM AND 6.5 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| HS7020C6 PRIMARY | The Boeing Company (USA) |
| AS12987C6 | Anillo Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| OSS7020C6 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corp Div Weapon System |
| OSS7020C6 | 5/9 Secondary reference Alliant Techsystems Operations Llc |
| HS7020C6 | 5/9 Secondary reference Mcdonnell Douglas Helicopter Co Inc |
| M6DIN127-A2 | 5/9 Secondary reference Zelenda Machine and Tools Corp |
NSN 5310-01-189-4591 is a Washer,lock, manufactured by The Boeing Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-189-4591 has 2 manufacturer part numbers on file: HS7020C6 (The Boeing Company), AS12987C6 (Anillo Industries Llc).
Key specifications for HS7020C6: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 11.8 MILLIMETERS NOMINAL MM; Material Thickness: 1.6 MILLIMETERS NOMINAL MM. 7 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.