The Washer,key, cataloged under National Stock Number 5310-01-174-8240, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Div Tridair Products. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-174-8240 |
| Primary Part Number | CA21062-4R |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Tridair Products |
| Status | ACTIVE |
| Internal Straight Key Width | 0.044 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.080 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Style Designator | KEY |
| Material Document and Classification | MIL-S-25043,COND TH1050 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.387 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN |
| Material Thickness | 0.023 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 631 OVERALL |
| Internal Key Quantity | 2 |
| Hole Diameter | 0.311 INCHES MINIMUM AND 0.317 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 |
|---|---|
| CA21062-4R PRIMARY | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
| 12617378-2 PRIMARY | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate (USA) |
| Reference | Meaning |
|---|---|
| 5310PL0787725 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 277-518-0002 | 5/9 Secondary reference U.S. Government activity |
| 5310PL1757041 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5310-01-174-8240 is a Washer,key, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-174-8240 has 2 manufacturer part numbers on file: CA21062-4R (Howmet Global Fastening Systems Inc. Div Tridair Products), 12617378-2 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate).
Key specifications for CA21062-4R: Internal Straight Key Width: 0.044 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.080 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Style Designator: KEY. 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.