Osg 1242202 Spiral Point Tap 7/16-20 Unf Hss

Product Description

The OSG 1242202 is a spiral point plug tap designed for threading 7/16-20 UNF right-hand internal threads in a wide range of metals. Built from high-speed steel and finished with an elektraLUBE coating, this tap is suited for production threading in through-hole applications. The spiral point geometry pushes chips forward ahead of the tap, reducing clogging and allowing smoother cutting at higher speeds. With 3 flutes, an H5 thread limit, and a 1.4375-inch thread length, it delivers consistent thread form in both manual and machine tapping setups. Machinists and toolroom professionals use this tap for general-purpose UNF threading work.

The OSG 1242202 is appropriate for threading operations in automotive, aerospace, general fabrication, and maintenance environments. It covers a broad range of workpiece materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The plug chamfer provides a gradual lead-in, making it effective for both starting threads and completing through-hole threading passes on CNC machining centers, drill presses, and tapping machines.

Key Features

• 7/16-20 UNF thread size for fine-pitch right-hand threading
• Spiral point design pushes chips forward, ideal for through-hole applications
• High-speed steel construction provides hardness and wear resistance across a broad material range
• elektraLUBE coating reduces friction and heat buildup during the cut
• H5 thread limit ensures controlled, consistent thread tolerance
• 3-flute plug chamfer geometry for gradual entry and smooth threading

Compatibility

Designed for use in through-hole tapping applications requiring 7/16-20 UNF right-hand threads across aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces.

Installation Notes

This tap should be installed in a properly sized tap holder or collet with adequate alignment to the pilot hole to prevent tap breakage. Always use the recommended cutting fluid for the workpiece material even though this tap carries an elektraLUBE coating, as additional lubrication extends tool life. Power down or disengage the spindle before securing or removing the tap. Follow shop safety practices and applicable OSHA standards when operating tapping equipment.