The Screw,machine, cataloged under National Stock Number 5305-01-019-2385, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-019-2385 |
| Primary Part Number | NAS1221-4-36 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Screw Surface Treatment | CADMIUM |
| Fastener Length | 2.661 INCHES MINIMUM AND 2.691 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 | 0.401 INCHES MINIMUM AND 0.451 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| Nominal Thread Diameter | 0.250 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 | 28 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.461 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN |
| Screw Surface Treatment Document and Classification | QQ-P-416,TY 1,CL 3 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 |
|---|---|
| NAS1221-4-36 PRIMARY | Hi-Shear Corporation (USA) |
| NAS1221-4-36 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| NAS1221-4-36 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| NAS1221-4-36 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| NAS1221-4-36 PRIMARY | Huck International, Inc (USA) |
| NAS1221-4-36 | Nor-Cal Supply Co (USA) |
| Reference | Meaning |
|---|---|
| NAS1221-4-36 | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| NAS1221-4-36 | 5/9 Secondary reference Air Industries Co Inc |
| NAS1221-4-36 | 5/9 Secondary reference U.S. Government activity |
| NAS1221-4-36 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1221-4-36 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1221-4-36 | 5/9 Secondary reference F and C Sales Inc |
NSN 5305-01-019-2385 is a Screw,machine, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-019-2385 has 6 manufacturer part numbers on file: NAS1221-4-36 (Hi-Shear Corporation), NAS1221-4-36 (Fastener Innovation Technology, Inc. Dba F I T), NAS1221-4-36 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), NAS1221-4-36 (Sps Technologies, Llc Dba PB Fasteners), NAS1221-4-36 (Huck International, Inc) and 1 more.
Key specifications for NAS1221-4-36: Screw Surface Treatment: CADMIUM; Fastener Length: 2.661 INCHES MINIMUM AND 2.691 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: 0.401 INCHES MINIMUM AND 0.451 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.