The Washer,flat, cataloged under National Stock Number 5310-01-446-0243, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Trico Manufacturing 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-446-0243 |
| Primary Part Number | 4M307-3-42 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Trico Manufacturing Inc. |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-5541,CLASS 3 MIL SPEC 2ND TREATMENT RESPONSE OVERALL |
| Overall Diameter | 1.484 INCHES NOMINAL IN |
| Material Document and Classification | QQ-A-250/11,COND T6 FED SPEC 1ST MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | OIL OVERALL |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY 6061 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.656 INCHES NOMINAL IN |
| Thickness | 0.025 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 |
|---|---|
| 4M307-3-42 | Trico Manufacturing Inc. (USA) |
| Reference | Meaning |
|---|---|
| 4M307-3-42 | 3/9 Design control — primary reference The Boeing Company Div Defense |
NSN 5310-01-446-0243 is a Washer,flat, manufactured by Trico Manufacturing Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-446-0243 has 1 manufacturer part number on file: 4M307-3-42 (Trico Manufacturing Inc.).
Key specifications for 4M307-3-42: Surface Treatment Document and Classification: MIL-C-5541,CLASS 3 MIL SPEC 2ND TREATMENT RESPONSE OVERALL; Overall Diameter: 1.484 INCHES NOMINAL IN; Material Document and Classification: QQ-A-250/11,COND T6 FED SPEC 1ST 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.