Scientific Cutting Tools LHTT290750 Threading Tool

Product Description

The SCIENTIFIC CUTTING TOOLS LHTT290750 is a left-hand, internal single point threading tool ground from solid carbide for use in CNC lathes and manual turning centers. It handles thread pitches from 12 to 40 TPI with a 60-degree profile angle, covering a wide range of unified and metric-style internal thread forms. The minimum threading diameter is 0.29 inches, and the tool reaches a cutting depth of 0.75 inches, making it suitable for threading bores in tight-tolerance workpieces. The bright, uncoated finish is standard for solid carbide tooling where coating adhesion or dimensional buildup is a concern. Machinists and toolroom operators are the primary users of this tool.

This tool is designed for internal threading operations on metalworking lathes, both CNC and manual. The left-hand thread direction makes it appropriate for applications requiring reverse-helix threads, such as left-hand fastener bores, lead screws, and specialty fixtures. The 5/16-inch shank diameter fits standard boring bar holders and quick-change toolposts commonly found in light to medium-duty turning setups. The 0.07-inch projection from the edge positions the cutting point for clearance in confined bore entries. Overall length is 2.5 inches, keeping the tool compact and reducing overhang-related chatter during threading passes.

Key Features

• Left-hand internal thread direction for reverse-helix bore threading applications
• 60-degree profile angle covers unified inch thread forms across a broad TPI range
• 12 to 40 TPI range handles coarse through fine thread pitches in a single tool
• Solid carbide construction provides rigidity and wear resistance in ferrous and non-ferrous materials
• Bright, uncoated finish maintains precise edge geometry without coating buildup
• 0.07-inch projection from edge provides clearance for entry into tight bore profiles

Compatibility

Designed as an OEM-style single point threading tool for use in standard 5/16-inch shank boring bar holders and quick-change toolpost systems on metalworking lathes configured for internal threading operations.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the lathe spindle before seating or adjusting the tool in the holder. Secure the shank fully within the holder to minimize overhang and reduce chatter during threading passes. Verify thread direction setup in the lathe control or gearbox before initiating the first cutting pass to confirm left-hand thread engagement.