The Washer,shouldered, cataloged under National Stock Number 5310-00-531-9405, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Patterson Pump Co Div Patterson Pump Company. Government technical data includes 7 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-531-9405 |
| Primary Part Number | E8601 |
| Item Name | Washer,shouldered |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Patterson Pump Co Div Patterson Pump Company |
| Status | ACTIVE |
| Shoulder Height | 0.221 INCHES NOMINAL IN |
| Style Designator | SHOULDERED |
| Material Document and Classification | QQ-M-80 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 3.745 INCHES NOMINAL IN |
| Material Thickness | 0.232 INCHES NOMINAL IN |
| Shoulder Diameter | 1.687 INCHES NOMINAL IN |
| Hole Diameter | 1.250 INCHES MINIMUM AND 1.253 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 |
|---|---|
| E8601 PRIMARY | Patterson Pump Co Div Patterson Pump Company (USA) |
NSN 5310-00-531-9405 is a Washer,shouldered, manufactured by Patterson Pump Co Div Patterson Pump Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-531-9405 has 1 manufacturer part number on file: E8601 (Patterson Pump Co Div Patterson Pump Company).
Key specifications for E8601: Shoulder Height: 0.221 INCHES NOMINAL IN; Style Designator: SHOULDERED; Material Document and Classification: QQ-M-80 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 3.745 INCHES NOMINAL IN. 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.