The Washer,flat, cataloged under National Stock Number 5310-01-175-1034, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Ridge Engineering, Llc.. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-175-1034 |
| Primary Part Number | 121B514H01 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Ridge Engineering, Llc. |
| Status | ACTIVE |
| FSC Application Data | AN/TPS 43E |
| Width Across Flats | 1.600 INCHES NOMINAL IN |
| Length | 2.000 INCHES NOMINAL IN |
| Material Document and Classification | QQ-S-766 CL 302 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | RECTANGULAR |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND W/FLATS |
| Thickness | 0.090 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 |
|---|---|
| 121B514H01 PRIMARY | Ridge Engineering, Llc. (USA) |
| Reference | Meaning |
|---|---|
| 335C691H21 | 5/9 Secondary reference U.S. Government activity |
| 121B514H01 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-175-1034 is a Washer,flat, manufactured by Ridge Engineering, Llc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-175-1034 has 1 manufacturer part number on file: 121B514H01 (Ridge Engineering, Llc.).
Key specifications for 121B514H01: FSC Application Data: AN/TPS 43E; Width Across Flats: 1.600 INCHES NOMINAL IN; Length: 2.000 INCHES NOMINAL IN; Material Document and Classification: QQ-S-766 CL 302 FED SPEC SINGLE MATERIAL RESPONSE 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.