The Screw,close Tolerance, cataloged under National Stock Number 5305-01-260-9345, 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 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-260-9345 |
| Primary Part Number | HT271A6-17 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM IN |
| Fastener Length | 1.6875 INCHES MINIMUM AND 1.7345 INCHES MAXIMUM IN |
| Thread Length | 0.641 INCHES NOMINAL IN |
| Material Document and Classification | AMS4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Features Provided | O RING |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.0525 INCHES MINIMUM AND 1.0725 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| 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 | 24 |
| Material | TITANIUM ALLOY UNS R56400 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.7290 INCHES MINIMUM AND 0.7604 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 |
|---|---|
| HT271A6-17 PRIMARY | Hi-Shear Corporation (USA) |
| HT271A6-17 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M430V6-17AS | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 10113604 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-01-260-9345 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-260-9345 has 3 manufacturer part numbers on file: HT271A6-17 (Hi-Shear Corporation), HT271A6-17 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M430V6-17AS (The Boeing Company Div Defense).
Key specifications for HT271A6-17: Head Height: 0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM IN; Fastener Length: 1.6875 INCHES MINIMUM AND 1.7345 INCHES MAXIMUM IN; Thread Length: 0.641 INCHES NOMINAL IN; Material Document and Classification: AMS4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.