The Washer,flat, cataloged under National Stock Number 5310-01-681-3638, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hydraulics International, Inc. Dba Hydraulics International Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-681-3638 |
| Primary Part Number | 130009-279-1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hydraulics International, Inc. Dba Hydraulics International Inc |
| Status | ACTIVE |
| Overall Diameter | 3.25 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | BLANK RECTANGULAR |
| Color | BLACK OVERALL |
| Peripheral Shape Style | ROUND |
| Material | PLASTIC OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.20 INCHES NOMINAL IN |
| Thickness | 0.125 INCHES NOMINAL IN |
| Inside Radius | 2.28 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 |
|---|---|
| 130009-279-1 PRIMARY | Hydraulics International, Inc. Dba Hydraulics International Inc (USA) |
| Reference | Meaning |
|---|---|
| 13000-279 | 3/9 Design control — primary reference Hydraulics International, Inc. Dba Hydraulics International Inc |
NSN 5310-01-681-3638 is a Washer,flat, manufactured by Hydraulics International, Inc. Dba Hydraulics International Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-681-3638 has 1 manufacturer part number on file: 130009-279-1 (Hydraulics International, Inc. Dba Hydraulics International Inc).
Key specifications for 130009-279-1: Overall Diameter: 3.25 INCHES NOMINAL IN; Cross-Sectional Shape Style: BLANK RECTANGULAR; Color: BLACK OVERALL; Peripheral Shape Style: ROUND. 9 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.