The Washer,concave, cataloged under National Stock Number 5310-00-237-7705, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-237-7705 |
| Primary Part Number | HL382-16PBW |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.375 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 OR AMS 5520 ASSN STD 3RD MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.935 INCHES MINIMUM AND 0.945 INCHES MAXIMUM IN |
| Recess Depth | 0.156 INCHES NOMINAL IN |
| Material Thickness | 0.252 INCHES NOMINAL IN |
| Specification/standard Data | 76301-ST3-552 MANUFACTURERS STANDARD |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL COMP 630 OR STEEL COMP 631 OR STEEL COMP 632 OVERALL |
| Hole Diameter | 0.685 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 |
|---|---|
| HL382-16PBW PRIMARY | Hi-Shear Corporation (USA) |
| HL382-16PBW PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M552-8 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HL382-16PBW | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-237-7705 is a Washer,concave, manufactured by Hi-Shear Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-237-7705 has 3 manufacturer part numbers on file: HL382-16PBW (Hi-Shear Corporation), HL382-16PBW (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M552-8 (The Boeing Company Div Defense).
Key specifications for HL382-16PBW: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.375 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 OR AMS 5520 ASSN STD 3RD MATERIAL RESPONSE OVERALL. 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.