The Screw,machine, cataloged under National Stock Number 5305-01-024-4751, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-024-4751 |
| Primary Part Number | NAS1221-3E2 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Screw Surface Treatment | PASSIVATE |
| Fastener Length | 0.449 INCHES MINIMUM AND 0.479 INCHES MAXIMUM IN |
| Screw Material Document and Classification | AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE |
| Thread Length | 0.314 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN |
| 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 | IRON ALLOY 660 |
| 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-35 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 |
|---|---|
| NAS1221-3E2 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| NAS1221-3E2 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| P32790 | Martin-Baker Aircraft Company Limited (GBR) |
| NAS1221-3E2 | Huck International, Inc (USA) |
| NAS1221-3E2 PRIMARY | Hi-Shear Corporation (USA) |
| NAS1221-3E2 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| NAS1221-3E2 | Nor-Cal Supply Co (USA) |
| Reference | Meaning |
|---|---|
| NAS1221-3E2 | 5/9 Secondary reference U.S. Government activity |
| NAS1221-3E2 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| NAS1221-3E2 | 5/9 Secondary reference Air Industries Co Inc |
| NAS1221-3E2 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1221-3E2 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1221-3E2 | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| NAS1221 3E2 | 5/9 Secondary reference U.S. Government activity |
| NAS1221-3E2 | 5/9 Secondary reference F and C Sales Inc |
NSN 5305-01-024-4751 is a Screw,machine, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-024-4751 has 7 manufacturer part numbers on file: NAS1221-3E2 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), NAS1221-3E2 (Howmet Global Fastening Systems Inc), P32790 (Martin-Baker Aircraft Company Limited), NAS1221-3E2 (Huck International, Inc), NAS1221-3E2 (Hi-Shear Corporation) and 2 more.
Key specifications for NAS1221-3E2: Screw Surface Treatment: PASSIVATE; Fastener Length: 0.449 INCHES MINIMUM AND 0.479 INCHES MAXIMUM IN; Screw Material Document and Classification: AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE; Thread Length: 0.314 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN. 17 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.