The Screw,close Tolerance, cataloged under National Stock Number 5305-01-374-5944, 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 18 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-374-5944 |
| Primary Part Number | HT271A3-7M |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.0785 INCHES MINIMUM AND 0.0805 INCHES MAXIMUM IN |
| Fastener Length | 0.838 INCHES MINIMUM AND 0.865 INCHES MAXIMUM IN |
| Thread Length | 0.406 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Features Provided | DRY FILM LUBRICANT AND O RING |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | TITANIUM ALLOY UNS R56400 OR TITANIUM ALLOY UNS R56440 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.276 INCHES MINIMUM AND 0.286 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 |
|---|---|
| ST3M430V3-7ASM | Huck International, Inc (USA) |
| ST3M430V3-7ASM | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT271A3-7M PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT271A3-7M PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| ST3M430V3-7ASM | 5/2 Secondary reference U.S. Government activity |
| ST3M430V3-7ASM | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M430V3-7ASM | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-374-5944 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-374-5944 has 4 manufacturer part numbers on file: ST3M430V3-7ASM (Huck International, Inc), ST3M430V3-7ASM (Sps Technologies Ltd, Tj Brooks Division), HT271A3-7M (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT271A3-7M (Hi-Shear Corporation).
Key specifications for HT271A3-7M: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.0785 INCHES MINIMUM AND 0.0805 INCHES MAXIMUM IN; Fastener Length: 0.838 INCHES MINIMUM AND 0.865 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.