The Washer,concave, cataloged under National Stock Number 5310-01-367-6765, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-367-6765 |
| Primary Part Number | 4M226B3MH |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-8837 TY 2,CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.218 INCHES MINIMUM AND 0.238 INCHES MAXIMUM IN |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM |
| Style Designator | CONCAVE |
| Material Document and Classification | AMS 6467 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.390 INCHES MINIMUM AND 0.400 INCHES MAXIMUM IN |
| Material Thickness | 0.062 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL COMP H11 OVERALL |
| Hole Diameter | 0.253 INCHES MINIMUM AND 0.263 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 |
|---|---|
| 4M226B3MH PRIMARY | The Boeing Company Div Defense (USA) |
| 79684CCM-3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
NSN 5310-01-367-6765 is a Washer,concave, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-367-6765 has 2 manufacturer part numbers on file: 4M226B3MH (The Boeing Company Div Defense), 79684CCM-3 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 4M226B3MH: Surface Treatment Document and Classification: MIL-C-8837 TY 2,CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.218 INCHES MINIMUM AND 0.238 INCHES MAXIMUM IN; Hardness Rating: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM; Style Designator: CONCAVE. 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.