The Washer,flat, cataloged under National Stock Number 5310-01-178-1225, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bae Systems Space & Mission Systems Inc. Div Space & Mission Systems Inc.. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-178-1225 |
| Primary Part Number | 501518-1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bae Systems Space & Mission Systems Inc. Div Space & Mission Systems Inc. |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5510 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5512 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 321 OR STEEL COMP 347 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.255 INCHES MINIMUM AND 0.275 INCHES MAXIMUM IN |
| Thickness | 0.063 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 |
|---|---|
| 501518-1 PRIMARY | Bae Systems Space & Mission Systems Inc. Div Space & Mission Systems Inc. (USA) |
NSN 5310-01-178-1225 is a Washer,flat, manufactured by Bae Systems Space & Mission Systems Inc. Div Space & Mission Systems Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-178-1225 has 1 manufacturer part number on file: 501518-1 (Bae Systems Space & Mission Systems Inc. Div Space & Mission Systems Inc.).
Key specifications for 501518-1: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Material Document and Classification: AMS 5510 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5512 ASSN STD 2ND 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.