The Washer,concave, cataloged under National Stock Number 5310-01-167-3679, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-167-3679 |
| Primary Part Number | HL75-6DW |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-L-8937 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.200 INCHES NOMINAL IN |
| Style Designator | CONCAVE |
| Material Document and Classification | AMS 5528 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5520 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.355 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN |
| Recess Depth | 0.047 INCHES NOMINAL IN |
| Material Thickness | 0.085 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN |
| Surface Treatment | OXIDE FILM OVERALL |
| Material | STEEL COMP 630 OR STEEL COMP 632 OVERALL |
| Hole Diameter | 0.255 INCHES NOMINAL 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 |
|---|---|
| HL75-6DW | West Coast Aerospace, Inc. (USA) |
| HL75-6DW | Huck International, Inc (USA) |
| HL75-6DW | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HL75-6DW PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HL75-6DW | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HL75-6DW PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HL75-6DW | 5/2 Secondary reference U.S. Government activity |
| 03A084-6L | 5/9 Secondary reference Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems |
NSN 5310-01-167-3679 is a Washer,concave, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-167-3679 has 6 manufacturer part numbers on file: HL75-6DW (West Coast Aerospace, Inc.), HL75-6DW (Huck International, Inc), HL75-6DW (Sps Technologies, Llc Dba PB Fasteners), HL75-6DW (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HL75-6DW (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 1 more.
Key specifications for HL75-6DW: Surface Treatment Document and Classification: MIL-L-8937 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.200 INCHES NOMINAL IN; Style Designator: CONCAVE; Material Document and Classification: AMS 5528 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5520 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.