The Screw,close Tolerance, cataloged under National Stock Number 5305-01-238-2170, 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 17 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-238-2170 |
| Primary Part Number | HT271-3-10 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.439 INCHES MINIMUM AND 0.459 INCHES MAXIMUM IN |
| Fastener Length | 1.015 INCHES MINIMUM AND 1.062 INCHES MAXIMUM IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Material Document and Classification | MS4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.615 INCHES MINIMUM AND 0.635 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 MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.376 INCHES MINIMUM AND 0.381 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 |
|---|---|
| HT271-3-10 PRIMARY | Hi-Shear Corporation (USA) |
| HT271-3-10 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BM33024V3-10 PRIMARY | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| BM33024V3-10 | 5/9 Secondary reference U.S. Government activity |
| 110179-3-10 | 3/2 Design control — primary reference U.S. Government activity |
| HT8137-3-10 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M430V3-10D | 5/9 Secondary reference The Boeing Company Div Defense |
NSN 5305-01-238-2170 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-238-2170 has 3 manufacturer part numbers on file: HT271-3-10 (Hi-Shear Corporation), HT271-3-10 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), BM33024V3-10 (Huck International, Inc).
Key specifications for HT271-3-10: Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.439 INCHES MINIMUM AND 0.459 INCHES MAXIMUM IN; Fastener Length: 1.015 INCHES MINIMUM AND 1.062 INCHES MAXIMUM IN; Thread Length: 0.380 INCHES MINIMUM AND 0.447 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.