The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-355-0202, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Div Tridair Products. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-355-0202 |
| Primary Part Number | CA21274-4-6HS |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Tridair Products |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Width Across Flats | 0.1409 INCHES MINIMUM AND 0.1426 INCHES MAXIMUM IN |
| Fastener Length | 1.252 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.682 INCHES MINIMUM AND 0.821 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5673 ASSN STD SINGLE MATERIAL RESPONSE SPRING |
| Material Document and Classification | AMS5643 ASSN STD SINGLE MATERIAL RESPONSE BEARING SURFACE OF HEAD |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HEXAGON |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 631 SPRING |
| Material | STEEL COMP 630 BEARING SURFACE OF HEAD |
| Thread Series Designator | UNF |
| Head Diameter | 0.430 INCHES MINIMUM AND 0.440 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 |
|---|---|
| CA21274-4-6HS PRIMARY | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
NSN 5305-01-355-0202 is a Screw,cap,socket Head, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-355-0202 has 1 manufacturer part number on file: CA21274-4-6HS (Howmet Global Fastening Systems Inc. Div Tridair Products).
Key specifications for CA21274-4-6HS: Surface Finish: 32.0 MICROINCHES GRIP; Width Across Flats: 0.1409 INCHES MINIMUM AND 0.1426 INCHES MAXIMUM IN; Fastener Length: 1.252 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 19 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.