The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-149-1933, 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 16 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-149-1933 |
| Primary Part Number | CA21037-4-6HS |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Tridair Products |
| Status | ACTIVE |
| Width Across Flats | 0.141 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN |
| Fastener Length | 1.237 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.567 INCHES MINIMUM AND 0.706 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | HEXAGON |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 4140 OR STEEL COMP 8740 OVERALL |
| 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 |
|---|---|
| CA21037-4-6HS PRIMARY | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
| 120000-4-6 PRIMARY | Monadnock Company, the Dba Lisi Aerospace (USA) |
| Reference | Meaning |
|---|---|
| 5305PL0884148 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| C9537-4-6 | 7/2 Vendor item drawing reference U.S. Government activity |
| 5305PL1635689 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5305-01-149-1933 is a Screw,cap,socket Head, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-149-1933 has 2 manufacturer part numbers on file: CA21037-4-6HS (Howmet Global Fastening Systems Inc. Div Tridair Products), 120000-4-6 (Monadnock Company, the Dba Lisi Aerospace).
Key specifications for CA21037-4-6HS: Width Across Flats: 0.141 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN; Fastener Length: 1.237 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.567 INCHES MINIMUM AND 0.706 INCHES MAXIMUM IN. 16 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.