The Washer,flat, cataloged under National Stock Number 5310-01-178-9245, 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 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-178-9245 |
| Primary Part Number | 432R979H01 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Ridge Engineering, Llc. |
| Status | ACTIVE |
| Surface Treatment Document and Classification | PS83116NA,FSCM 97942 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.310 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN |
| Material Document and Classification | PDS10706HA,FSCM 97942 MFR REF 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 | 0.195 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN |
| Thickness | 0.040 INCHES MINIMUM AND 0.060 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 |
| Part Number | Manufacturer |
|---|---|
| 432R979H01 | Ridge Engineering, Llc. (USA) |
| 432R979H01 | Flightfab, Inc. Dba Ffi Aerospace & Defense (USA) |
| Reference | Meaning |
|---|---|
| 432R979H01 | 3/2 Design control — primary reference U.S. Government activity |
| 432R979H01 | 5/9 Secondary reference Micro Machining, Inc |
NSN 5310-01-178-9245 is a Washer,flat, manufactured by Ridge Engineering, Llc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-178-9245 has 2 manufacturer part numbers on file: 432R979H01 (Ridge Engineering, Llc.), 432R979H01 (Flightfab, Inc. Dba Ffi Aerospace & Defense).
Key specifications for 432R979H01: Surface Treatment Document and Classification: PS83116NA,FSCM 97942 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.310 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN; Material Document and Classification: PDS10706HA,FSCM 97942 MFR REF 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.