The Screw,close Tolerance, cataloged under National Stock Number 5305-01-043-1859, 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 6 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-043-1859 |
| Primary Part Number | NAS1221-06V4 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Material Document and Classification | NAS621 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Specification/standard Data | 80205-NAS1221 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| NAS1221-06V4 PRIMARY | Hi-Shear Corporation (USA) |
| NAS1221-06V4 | Nor-Cal Supply Co (USA) |
| NAS1221-06V4 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| NAS1221-06V4 PRIMARY | Huck International, Inc (USA) |
| NAS1221-06V4 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| NAS1221-06V4 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1221-06V4 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1221-06V4 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| NAS1221-06V4 | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| NAS1221-06V4 | 5/9 Secondary reference U.S. Government activity |
| NAS1221-06V4 | 5/9 Secondary reference F and C Sales Inc |
| NAS1221-06V4 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1221-06V4 | 5/9 Secondary reference Air Industries Co Inc |
NSN 5305-01-043-1859 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-043-1859 has 5 manufacturer part numbers on file: NAS1221-06V4 (Hi-Shear Corporation), NAS1221-06V4 (Nor-Cal Supply Co), NAS1221-06V4 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), NAS1221-06V4 (Huck International, Inc), NAS1221-06V4 (Fastener Innovation Technology, Inc. Dba F I T).
Key specifications for NAS1221-06V4: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Material Document and Classification: NAS621 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Specification/standard Data: 80205-NAS1221 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD. 6 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.