The Washer,flat, cataloged under National Stock Number 5310-01-010-3701, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Western Gasket and Packing Co. Government technical data includes 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-010-3701 |
| Primary Part Number | H300-225 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Western Gasket and Packing Co |
| Status | ACTIVE |
| Overall Diameter | 0.518 INCHES MINIMUM AND 0.538 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-5059 HALF HARD,2D FINISH MIL SPEC ALL MATERIAL RESPONSES OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 304 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.256 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Thickness | 0.015 INCHES MINIMUM AND 0.016 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 |
|---|---|
| H300-225 PRIMARY | Western Gasket and Packing Co (USA) |
| Reference | Meaning |
|---|---|
| B700-225 | 5/9 Secondary reference Master Washer and Stamping Co |
| 993300-225 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5310-01-010-3701 is a Washer,flat, manufactured by Western Gasket and Packing Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-010-3701 has 1 manufacturer part number on file: H300-225 (Western Gasket and Packing Co).
Key specifications for H300-225: Overall Diameter: 0.518 INCHES MINIMUM AND 0.538 INCHES MAXIMUM IN; Material Document and Classification: MIL-S-5059 HALF HARD,2D FINISH MIL SPEC ALL MATERIAL RESPONSES OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 8 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.