The Washer,concave, cataloged under National Stock Number 5310-01-328-2049, 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 8 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-328-2049 |
| Primary Part Number | HL75-12DW |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Radius | 0.380 INCHES NOMINAL IN |
| Style Designator | CONCAVE |
| Material Document and Classification | AMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.780 INCHES MINIMUM AND 0.790 INCHES MAXIMUM IN |
| Material Thickness | 0.135 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN |
| Surface Treatment | LUBRICANT OVERALL |
| Material | STEEL COMP 630 OR STEEL COMP 631 OVERALL |
| Hole Diameter | 0.490 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 |
|---|---|
| HL75-12DW PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HL75-12DW PRIMARY | Hi-Shear Corporation (USA) |
| HL75-12DW | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 03A084-12L | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| Reference | Meaning |
|---|---|
| HL75-12DW | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-328-2049 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 5310-01-328-2049 has 4 manufacturer part numbers on file: HL75-12DW (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HL75-12DW (Hi-Shear Corporation), HL75-12DW (Sps Technologies, Llc Dba PB Fasteners), 03A084-12L (Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems).
Key specifications for HL75-12DW: Radius: 0.380 INCHES NOMINAL IN; Style Designator: CONCAVE; Material Document and Classification: AMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL; Outside Diameter: 0.780 INCHES MINIMUM AND 0.790 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.