The Washer,concave, cataloged under National Stock Number 5310-00-500-1920, 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 8 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-00-500-1920 |
| Primary Part Number | HLT71-5W |
| 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 |
| 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 | 0.355 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN |
| Recess Depth | 0.053 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN |
| Material Thickness | 0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL COMP 630 OR STEEL COMP 631 OR STEEL COMP 632 OVERALL |
| Hole Diameter | 0.235 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 |
|---|---|
| HLT71-5W | West Coast Aerospace, Inc. (USA) |
| HLT71-5W PRIMARY | Hi-Shear Corporation (USA) |
| HLT71-5W | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HLT71-5W | Huck International, Inc (USA) |
| HLT71-5W | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| HLT71-5W | 5/9 Secondary reference Sps Technologies Inc Unbrako Div |
| HLT71-5W | 5/2 Secondary reference U.S. Government activity |
NSN 5310-00-500-1920 is a Washer,concave, manufactured by Hi-Shear Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-500-1920 has 5 manufacturer part numbers on file: HLT71-5W (West Coast Aerospace, Inc.), HLT71-5W (Hi-Shear Corporation), HLT71-5W (Sps Technologies, Llc Dba PB Fasteners), HLT71-5W (Huck International, Inc), HLT71-5W (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company).
Key specifications for HLT71-5W: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; 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: 0.355 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN; Recess Depth: 0.053 INCHES MINIMUM AND 0.063 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.