The Washer,concave, cataloged under National Stock Number 5310-00-035-5311, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-035-5311 |
| Primary Part Number | ST3M589-6 |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Treatment Document and Classification | AMS 2416 ASSN STD 1ST TREATMENT RESPONSE AND AMS 2416 ASSN STD 2ND TREATMENT RESPONSE OVERALL |
| Radius | 0.456 INCHES NOMINAL IN |
| Style Designator | CONCAVE |
| Material Document and Classification | AMS 6304 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.728 INCHES MAXIMUM IN |
| Material Thickness | 0.204 INCHES NOMINAL IN |
| Recess Diameter | 0.609 INCHES NOMINAL IN |
| Surface Treatment | NICKEL AND CADMIUM OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.523 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 |
|---|---|
| ST3M589-6 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 66052W6 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
NSN 5310-00-035-5311 is a Washer,concave, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-035-5311 has 1 manufacturer part number on file: ST3M589-6 (The Boeing Company Div Defense).
Key specifications for ST3M589-6: Surface Treatment Document and Classification: AMS 2416 ASSN STD 1ST TREATMENT RESPONSE AND AMS 2416 ASSN STD 2ND TREATMENT RESPONSE OVERALL; Radius: 0.456 INCHES NOMINAL IN; Style Designator: CONCAVE; Material Document and Classification: AMS 6304 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.