The Nut,plain,extended Washer,hexago, cataloged under National Stock Number 5310-01-643-9975, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-643-9975 |
| Primary Part Number | 845-7526221-11X1-16 |
| Item Name | Nut,plain,extended Washer,hexago |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Washer Outside Diameter | 3.559 INCHES MINIMUM AND 3.565 INCHES MAXIMUM IN |
| Width Across Flats | 2.245 INCHES MINIMUM AND 2.250 INCHES MAXIMUM IN |
| Thread Series | ACME |
| Washer Thickness | 0.738 INCHES NOMINAL IN |
| Thread Direction | LEFT-HAND |
| Nominal Thread Size | 1.375 INCHES IN |
| Nut Style | HEXAGON |
| Thread Class | 3G G |
| Thread Quantity Per Inch | 4 |
| Material | MAGNESIUM ALLOY OVERALL |
| 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 |
|---|---|
| 845-7526221-11X1-16 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 7526221 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 5310-01-643-9975 is a Nut,plain,extended Washer,hexago, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-643-9975 has 1 manufacturer part number on file: 845-7526221-11X1-16 (Naval Sea Systems Command).
Key specifications for 845-7526221-11X1-16: Overall Height: 3.310 INCHES MINIMUM AND 3.330 INCHES MAXIMUM IN; Washer Outside Diameter: 3.559 INCHES MINIMUM AND 3.565 INCHES MAXIMUM IN; Width Across Flats: 2.245 INCHES MINIMUM AND 2.250 INCHES MAXIMUM IN; Thread Series: ACME. 10 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.