The Washer,concave, cataloged under National Stock Number 5310-01-172-5595, 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 8 specifications, cited from the U.S. Government catalog. The record lists 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-172-5595 |
| Primary Part Number | ST3M683-8 |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.510 INCHES NOMINAL IN |
| Style Designator | CONCAVE |
| Outside Diameter | 0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN |
| Material Thickness | 0.195 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 630 OR STEEL COMP 631 OR STEEL COMP 632 OVERALL |
| Hole Diameter | 0.646 INCHES MINIMUM AND 0.650 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 |
|---|---|
| SW2000-16W | Hi-Shear Corporation (USA) |
| ST3M683-8 PRIMARY | The Boeing Company Div Defense (USA) |
| SW2000-16W | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| SW2000-16W | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M683-8 | Howmet Global Fastening Systems Inc. Div Voi-Shan Products (USA) |
| ST3M683-8 | Moeller Manufacturing & Supply, Llc (USA) |
| Reference | Meaning |
|---|---|
| SW2000-16W | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-172-5595 is a Washer,concave, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-172-5595 has 6 manufacturer part numbers on file: SW2000-16W (Hi-Shear Corporation), ST3M683-8 (The Boeing Company Div Defense), SW2000-16W (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), SW2000-16W (Sps Technologies, Llc Dba PB Fasteners), ST3M683-8 (Howmet Global Fastening Systems Inc. Div Voi-Shan Products) and 1 more.
Key specifications for ST3M683-8: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.510 INCHES NOMINAL IN; Style Designator: CONCAVE; Outside Diameter: 0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN. 8 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.