The Washer,flat, cataloged under National Stock Number 5310-01-654-4871, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Electro Switch Corp. Dba Oak Grisgsby Div Electroswitch. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-654-4871 |
| Primary Part Number | 2-1179-188 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Electro Switch Corp. Dba Oak Grisgsby Div Electroswitch |
| Status | ACTIVE |
| Surface Treatment Document and Classification | NAVORD OD-7690 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.651 INCHES MINIMUM AND 0.661 INCHES MAXIMUM IN |
| Hardness Rating | 75.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 302 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.500 INCHES MINIMUM AND 0.504 INCHES MAXIMUM IN |
| Thickness | 0.032 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 |
|---|---|
| 2-1179-188 PRIMARY | Electro Switch Corp. Dba Oak Grisgsby Div Electroswitch (USA) |
| Reference | Meaning |
|---|---|
| 2-1179 | D/9 Drawing number reference only Electro Switch Corp. Dba Oak Grisgsby Div Electroswitch |
NSN 5310-01-654-4871 is a Washer,flat, manufactured by Electro Switch Corp. Dba Oak Grisgsby Div Electroswitch, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-654-4871 has 1 manufacturer part number on file: 2-1179-188 (Electro Switch Corp. Dba Oak Grisgsby Div Electroswitch).
Key specifications for 2-1179-188: Surface Treatment Document and Classification: NAVORD OD-7690 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.651 INCHES MINIMUM AND 0.661 INCHES MAXIMUM IN; Hardness Rating: 75.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM; 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.