The Screw,machine, cataloged under National Stock Number 5305-01-024-4750, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-024-4750 |
| Primary Part Number | NAS1221-3-4T |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Screw Surface Treatment | CADMIUM AND CHROMATE |
| Fastener Length | 0.574 INCHES MINIMUM AND 0.604 INCHES MAXIMUM IN |
| Screw Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE |
| Thread Length | 0.314 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1221 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Screw Material | STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 8740 |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.344 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Screw Surface Treatment Document and Classification | QQ-P-416 TY 2 CL 2 FED SPEC 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 |
|---|---|
| NAS1221-3-4T PRIMARY | Huck International, Inc (USA) |
| NAS1221-3-4T PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| NAS1221-3-4T PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| NAS1221-3-4T PRIMARY | Hi-Shear Corporation (USA) |
| NAS1221-3-4T PRIMARY | Soehnle Industrial Solutions Gmbh (DEU) |
| NAS1221-3-4T | Nor-Cal Supply Co (USA) |
| Reference | Meaning |
|---|---|
| NAS1221-3-4T | 5/9 Secondary reference U.S. Government activity |
| NAS1221-3-4T | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| NAS1221-3-4T | 3/2 Design control — primary reference U.S. Government activity |
| NAS1221-3-4T | 3/2 Design control — primary reference U.S. Government activity |
| NAS1221-3-4T | 5/9 Secondary reference Air Industries Co Inc |
| NAS1221-3-4T | 3/2 Design control — primary reference U.S. Government activity |
| NAS1221-3-4T | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
NSN 5305-01-024-4750 is a Screw,machine, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-024-4750 has 6 manufacturer part numbers on file: NAS1221-3-4T (Huck International, Inc), NAS1221-3-4T (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), NAS1221-3-4T (Fastener Innovation Technology, Inc. Dba F I T), NAS1221-3-4T (Hi-Shear Corporation), NAS1221-3-4T (Soehnle Industrial Solutions Gmbh) and 1 more.
Key specifications for NAS1221-3-4T: Screw Surface Treatment: CADMIUM AND CHROMATE; Fastener Length: 0.574 INCHES MINIMUM AND 0.604 INCHES MAXIMUM IN; Screw Material Document and Classification: MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE; Thread Length: 0.314 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN. 18 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.