The Washer,concave, cataloged under National Stock Number 5310-00-684-2758, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 11 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-684-2758 |
| Primary Part Number | 2935-06 |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.385 INCHES NOMINAL IN |
| Heat Treatment | AS FABRICATED |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM |
| Style Designator | CONCAVE |
| Outside Diameter | 0.683 INCHES MINIMUM AND 0.693 INCHES MAXIMUM IN |
| Recess Depth | 0.056 INCHES NOMINAL IN |
| Material Thickness | 0.137 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.467 INCHES MINIMUM AND 0.477 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 |
|---|---|
| 2935-06 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 2935-06 | 5/9 Secondary reference Harvard Industries Inc |
| 5310006842758 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 4188874-1 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-00-684-2758 is a Washer,concave, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-684-2758 has 1 manufacturer part number on file: 2935-06 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 2935-06: Surface Treatment Document and Classification: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.385 INCHES NOMINAL IN; Heat Treatment: AS FABRICATED; Hardness Rating: 32.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM. 11 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.