The Washer,flat, cataloged under National Stock Number 5310-01-417-1034, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Harper Engineering Company. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-417-1034 |
| Primary Part Number | H3-1233A3 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Harper Engineering Company |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-5541 CLASS3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.500 INCHES NOMINAL IN |
| Material Document and Classification | QQ-A-200 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Surface Treatment | CHROMATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY 7075 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.239 INCHES NOMINAL IN |
| Thickness | 0.060 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 |
|---|---|
| H3-1233A3 PRIMARY | Harper Engineering Company (USA) |
NSN 5310-01-417-1034 is a Washer,flat, manufactured by Harper Engineering Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-417-1034 has 1 manufacturer part number on file: H3-1233A3 (Harper Engineering Company).
Key specifications for H3-1233A3: Surface Treatment Document and Classification: MIL-C-5541 CLASS3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.500 INCHES NOMINAL IN; Material Document and Classification: QQ-A-200 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Special Features: 100.0 DEG COUNTERSUNK.. 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.