The Washer,flat, cataloged under National Stock Number 5310-01-723-5090, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Certified Stainless Service, Inc. Dba West-Mark Div West-Mark. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-723-5090 |
| Primary Part Number | F1-0520880 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Certified Stainless Service, Inc. Dba West-Mark Div West-Mark |
| Status | ACTIVE |
| Overall Diameter | 1.290 INCHES NOMINAL IN |
| Material Document and Classification | ASTM F436, HARDENED AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Color | BLACK OVERALL |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Thickness | 0.130 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 |
|---|---|
| F1-0520880 PRIMARY | Certified Stainless Service, Inc. Dba West-Mark Div West-Mark (USA) |
NSN 5310-01-723-5090 is a Washer,flat, manufactured by Certified Stainless Service, Inc. Dba West-Mark Div West-Mark, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-723-5090 has 1 manufacturer part number on file: F1-0520880 (Certified Stainless Service, Inc. Dba West-Mark Div West-Mark).
Key specifications for F1-0520880: Overall Diameter: 1.290 INCHES NOMINAL IN; Material Document and Classification: ASTM F436, HARDENED AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Color: BLACK OVERALL. 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.