The Washer,recessed, cataloged under National Stock Number 5310-01-371-8423, 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 7 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-371-8423 |
| Primary Part Number | 4M226B5H |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Radius | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM |
| Style Designator | RECESSED |
| Material Document and Classification | ASTM 6487,H-11 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.608 INCHES MINIMUM AND 0.618 INCHES MAXIMUM IN |
| Material | STEEL COMP H11 OVERALL |
| Hole Diameter | 0.417 INCHES MINIMUM AND 0.427 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 |
|---|---|
| 4M226B5H PRIMARY | The Boeing Company Div Defense (USA) |
| 4M226B5H | Precise Aero Products, Inc Dba Precise Aero Products Inc (USA) |
| 79684CC-5 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 10122264 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5310-01-371-8423 is a Washer,recessed, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-371-8423 has 3 manufacturer part numbers on file: 4M226B5H (The Boeing Company Div Defense), 4M226B5H (Precise Aero Products, Inc Dba Precise Aero Products Inc), 79684CC-5 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 4M226B5H: Radius: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN; Hardness Rating: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM; Style Designator: RECESSED; Material Document and Classification: ASTM 6487,H-11 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 7 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.