The Washer,flat, cataloged under National Stock Number 5310-01-018-5641, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Leonardo Spa Aeronautics Division - Pomigliano D'arco Site. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-018-5641 |
| Primary Part Number | NAS1587-10L |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Leonardo Spa Aeronautics Division - Pomigliano D'arco Site |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 1.062 INCHES NOMINAL IN |
| Material Document and Classification | MIL-S-6721,TY TI /321/ MIL SPEC SINGLE MATERIAL RESPONSE OR MIL-S-6721 TY CB-TA /347/ MIL SPEC SINGLE MATERIAL RESPONSE OR QQ-S-763,CL 321,COND A FED SPEC SINGLE MATERIAL RESPONSE OR QQ-S-763,CL 347,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.631 INCHES MINIMUM AND 0.643 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 |
|---|---|
| NAS1587-10L | Leonardo Spa Aeronautics Division - Pomigliano D'arco Site (ITA) |
| Reference | Meaning |
|---|---|
| NAS1587-10L | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-018-5641 is a Washer,flat, manufactured by Leonardo Spa Aeronautics Division - Pomigliano D'arco Site, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-018-5641 has 1 manufacturer part number on file: NAS1587-10L (Leonardo Spa Aeronautics Division - Pomigliano D'arco Site).
Key specifications for NAS1587-10L: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 1.062 INCHES NOMINAL IN; Material Document and Classification: MIL-S-6721,TY TI /321/ MIL SPEC SINGLE MATERIAL RESPONSE OR MIL-S-6721 TY CB-TA /347/ MIL SPEC SINGLE MATERIAL RESPONSE OR QQ-S-763,CL 321,COND A FED SPEC SINGLE MATERIAL RESPONSE OR QQ-S-763,CL 347,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 10 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.