Osg 1233801 Spiral Point Tap 3/4-16 Unf 3 Flute Hss

Product Description

The OSG 1233801 is a spiral point plug tap designed for threading 3/4-16 UNF internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a steam oxide coating, this tap handles through-hole applications by pushing chips forward ahead of the cut rather than backing them out. The plug chamfer provides a gradual lead-in over several threads, making it well-suited for general-purpose machine tapping. It carries an H3 thread limit and a 3B class of fit, delivering consistent tolerance control in production and maintenance environments. Licensed machinists, tool-and-die makers, and maintenance mechanics are the primary users.

This tap is applied in through-hole tapping operations across a broad spectrum of materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. With a 1.22-inch thread length and 4.25-inch overall length, it fits standard CNC machining centers, drill presses, and manual tapping heads. Series 105 designation aligns it with OSG standard straight-shank tap geometry. It is appropriate for both production shop floor use and maintenance repair operations where 3/4-16 UNF threads are required.

Key Features

• Spiral point geometry pushes chips forward, reducing clogging in through-hole applications
• High-speed steel construction provides durability across a wide range of work materials
• Steam oxide coating improves lubricity and corrosion resistance during cutting
• H3 thread limit with 3B class of fit ensures consistent, measurable tolerance control
• Plug chamfer allows gradual thread engagement, reducing tap breakage risk
• Right-hand thread direction compatible with standard tapping equipment

Compatibility

Designed for use in any standard tapping setup requiring a 3/4-16 UNF right-hand thread in through-hole configurations across aluminum, cast iron, and carbon or hardened steel workpieces.

Installation Notes

This tap should be installed by qualified machinists or maintenance technicians using a properly rated tapping head, CNC spindle, or manual tap wrench sized for the 0.59-inch shank diameter. Always secure the workpiece and confirm spindle alignment before engaging the tap to avoid deflection and breakage. Use appropriate cutting fluid or tapping compound for the specific work material to extend tool life. Do not reverse the tap under load without confirming the tapping head is equipped for reversible operation.