The Washer,flat, cataloged under National Stock Number 5310-01-262-8255, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Gasket Manufacturing Co.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-262-8255 |
| Primary Part Number | G3M27C58-328 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Gasket Manufacturing Co. |
| Status | ACTIVE |
| Overall Diameter | 0.687 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | PLASTIC POLYHEXAMETHYLENE ADIPAMIDE OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.315 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN |
| Thickness | 0.031 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 |
|---|---|
| G3M27C58-328 PRIMARY | Gasket Manufacturing Co. (USA) |
| H400-328 PRIMARY | Western Gasket and Packing Co (USA) |
| Reference | Meaning |
|---|---|
| 935400-328 | 5/9 Secondary reference Master Washer and Stamping Co |
NSN 5310-01-262-8255 is a Washer,flat, manufactured by Gasket Manufacturing Co., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-262-8255 has 2 manufacturer part numbers on file: G3M27C58-328 (Gasket Manufacturing Co.), H400-328 (Western Gasket and Packing Co).
Key specifications for G3M27C58-328: Overall Diameter: 0.687 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Material: PLASTIC POLYHEXAMETHYLENE ADIPAMIDE OVERALL. 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.