The Washer,flat, cataloged under National Stock Number 5310-01-666-7701, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Insitu, Inc.. Government technical data includes 9 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 | 5310-01-666-7701 |
| Primary Part Number | 001-000885-000 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Insitu, Inc. |
| Status | ACTIVE |
| Overall Diameter | 0.688 INCHES NOMINAL IN |
| Hardness Rating | 38.0 ROCKWELL C NOMINAL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.344 INCHES NOMINAL IN |
| Thickness | 0.055 INCHES MINIMUM AND 0.065 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 | V |
| Part Number | Manufacturer |
|---|---|
| 001-000885-000 PRIMARY | Insitu, Inc. (USA) |
| 98180A120 | Mcmaster-Carr Supply Co (USA) |
NSN 5310-01-666-7701 is a Washer,flat, manufactured by Insitu, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-666-7701 has 2 manufacturer part numbers on file: 001-000885-000 (Insitu, Inc.), 98180A120 (Mcmaster-Carr Supply Co).
Key specifications for 001-000885-000: Overall Diameter: 0.688 INCHES NOMINAL IN; Hardness Rating: 38.0 ROCKWELL C NOMINAL; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: ZINC 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.