The Washer,flat, cataloged under National Stock Number 5310-01-187-9564, 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-187-9564 |
| Primary Part Number | HS7012-4 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Overall Diameter | 8.0 MILLIMETERS NOMINAL MM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 4.0 MILLIMETERS NOMINAL MM |
| Thickness | 0.8 MILLIMETERS NOMINAL 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 |
|---|---|
| 4DIN1440 | Anillo Industries Llc (USA) |
| HS7012-4 PRIMARY | The Boeing Company (USA) |
| Reference | Meaning |
|---|---|
| M4DIN1440 | 5/9 Secondary reference Zelenda Machine and Tools Corp |
| HS7012-4 | 5/9 Secondary reference Mcdonnell Douglas Helicopter Co Inc |
| OSS7012-4 | 5/9 Secondary reference Alliant Techsystems Operations Llc |
| OSS7012-4 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corp Div Weapon System |
| 4DIN1440 | 5/9 Secondary reference U.S. Government activity |
| M4DIN | 5/9 Secondary reference Zelenda Machine and Tools Corp |
NSN 5310-01-187-9564 is a Washer,flat, manufactured by The Boeing Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-187-9564 has 2 manufacturer part numbers on file: 4DIN1440 (Anillo Industries Llc), HS7012-4 (The Boeing Company).
Key specifications for HS7012-4: Overall Diameter: 8.0 MILLIMETERS NOMINAL MM; Cross-Sectional Shape Style: RECTANGULAR; Special Features: ITEM CHAMFERED 0.3MM BY 45 DEGREES AROUND OUTSIDE DIAMETER MM; Peripheral Shape Style: ROUND. 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.