The Washer,flat, cataloged under National Stock Number 5310-01-133-0726, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Erie Engineered Products Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-133-0726 |
| Primary Part Number | 20-01938-01 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Erie Engineered Products Inc |
| Status | ACTIVE |
| Overall Diameter | 2.000 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY 6061 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.191 INCHES NOMINAL IN |
| Thickness | 0.090 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 |
|---|---|
| 20-01938-01 PRIMARY | Erie Engineered Products Inc (USA) |
| Reference | Meaning |
|---|---|
| 421938-01 | 5/9 Secondary reference Erie Engineered Products Inc |
NSN 5310-01-133-0726 is a Washer,flat, manufactured by Erie Engineered Products Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-133-0726 has 1 manufacturer part number on file: 20-01938-01 (Erie Engineered Products Inc).
Key specifications for 20-01938-01: Overall Diameter: 2.000 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Special Features: TEMPER T6; 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.