The Screw,machine, cataloged under National Stock Number 5305-01-478-0491, 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 13 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 | 5305-01-478-0491 |
| Primary Part Number | CA21135M4-4-9 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Tridair Products |
| Status | ACTIVE |
| Head Height | 1.02 MILLIMETERS MAXIMUM MM |
| External Thread Tolerance Class | 6G G |
| Screw Surface Treatment | PASSIVATE |
| Fastener Length | 14.27 MILLIMETERS NOMINAL MM |
| Screw Material Document and Classification | SAE-AMS-QQ-S-763 ASSN STD SINGLE MATERIAL RESPONSE |
| Thread Pitch in Millimeters | 0.7 |
| Nominal Thread Diameter | 4.0 MILLIMETERS MM |
| Head Style | PAN |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL CORROSION RESISTING |
| Thread Series Designator | ISO M |
| Head Diameter | 7.44 MILLIMETERS MINIMUM AND 7.80 MILLIMETERS MAXIMUM MM |
| Screw Surface Treatment Document and Classification | SAE-AMS-QQ-P-35 ASSN STD SINGLE TREATMENT RESPONSE |
| 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 |
|---|---|
| CA21135M4-4-9 PRIMARY | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
NSN 5305-01-478-0491 is a Screw,machine, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-478-0491 has 1 manufacturer part number on file: CA21135M4-4-9 (Howmet Global Fastening Systems Inc. Div Tridair Products).
Key specifications for CA21135M4-4-9: Head Height: 1.02 MILLIMETERS MAXIMUM MM; External Thread Tolerance Class: 6G G; Screw Surface Treatment: PASSIVATE; Fastener Length: 14.27 MILLIMETERS NOMINAL MM. 13 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.