The Washer,flat, cataloged under National Stock Number 5310-00-124-3031, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Librascope Corporation. Government technical data includes 11 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-124-3031 |
| Primary Part Number | 2060100 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Lockheed Martin Librascope Corporation |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-STD-171 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.263 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN |
| Heat Treatment | HARD |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 416 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.191 INCHES MINIMUM AND 0.201 INCHES MAXIMUM IN |
| Thickness | 0.042 INCHES MINIMUM AND 0.047 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 |
NSN 5310-00-124-3031 is a Washer,flat, manufactured by Lockheed Martin Librascope Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-124-3031 has 2 manufacturer part numbers on file: 2060100 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), 2060100 (Lockheed Martin Librascope Corporation).
Key specifications for 2060100: Surface Treatment Document and Classification: MIL-STD-171 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.263 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN; Heat Treatment: HARD; Material Document and Classification: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 11 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.