The Washer,recessed, cataloged under National Stock Number 5310-01-030-8420, 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 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-030-8420 |
| Primary Part Number | ST4M150C4001 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Style Designator | RECESSED |
| Material Document and Classification | QQ-S-763,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL |
| Outside Diameter | 0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Material Thickness | 0.074 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN |
| Recess Diameter | 0.334 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 75000 POUNDS PER SQUARE INCH LBS |
| Material | STEEL COMP 321 OR STEEL COMP 347 OVERALL |
| Hole Diameter | 0.252 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Recess Angle | 89.0 DEGREES MINIMUM AND 91.0 DEGREES MAXIMUM |
| 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 |
|---|---|
| ST4M150C4001 PRIMARY | The Boeing Company Div Defense (USA) |
NSN 5310-01-030-8420 is a Washer,recessed, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-030-8420 has 1 manufacturer part number on file: ST4M150C4001 (The Boeing Company Div Defense).
Key specifications for ST4M150C4001: Style Designator: RECESSED; Material Document and Classification: QQ-S-763,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL; Outside Diameter: 0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN; Material Thickness: 0.074 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN. 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.