The Washer,recessed, cataloged under National Stock Number 5310-01-138-2271, 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 | 5310-01-138-2271 |
| Primary Part Number | ST4M150E5002 |
| 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 | AMS5604,COND H1025 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5643,COND H1025 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.515 INCHES MINIMUM AND 0.535 INCHES MAXIMUM IN |
| Material Thickness | 0.106 INCHES MINIMUM AND 0.114 INCHES MAXIMUM IN |
| Recess Diameter | 0.396 INCHES MINIMUM AND 0.406 INCHES MAXIMUM IN |
| Color | BLUE, LIGHT OVERALL |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL CORROSION RESISTING OVERALL |
| Hole Diameter | 0.314 INCHES MINIMUM AND 0.322 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 |
|---|---|
| ST4M150E5002 PRIMARY | The Boeing Company Div Defense (USA) |
NSN 5310-01-138-2271 is a Washer,recessed, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-138-2271 has 1 manufacturer part number on file: ST4M150E5002 (The Boeing Company Div Defense).
Key specifications for ST4M150E5002: Style Designator: RECESSED; Material Document and Classification: AMS5604,COND H1025 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5643,COND H1025 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.515 INCHES MINIMUM AND 0.535 INCHES MAXIMUM IN; Material Thickness: 0.106 INCHES MINIMUM AND 0.114 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.