Osg 1645012243 Spiral Flute Tap Unc 12-24 Tin Hss

Product Description

The OSG 1645012243 is a spiral flute tap designed for threading 12-24 UNC holes in ferrous metals. It features a 45-degree helix angle that evacuates chips upward out of the hole, making it well suited for blind-hole applications where chip packing is a concern. The tap is ground from vanadium high-speed steel and coated with titanium nitride (TiN) to extend tool life and reduce friction during cutting. The modified bottoming chamfer allows threading close to the bottom of a blind hole. Thread class is 2B with an H3 limit, targeting standard-tolerance threaded assemblies. Installation is performed by machinists, tool-and-die makers, and maintenance technicians using a tapping machine, drill press, or hand tap wrench.

This tap is intended for use in steel and stainless steel workpieces, including alloy steel, cast iron, high-carbon steel, low-carbon steel, medium-carbon steel, and stainless steel. It is a right-hand thread, right-hand flute configuration. With an overall length of 3.15 inches and a tapping depth of 0.9375 inches, it fits standard tap holders for 12-24 applications. OSG Series 16450 taps are a production-grade tooling line used in job shops, maintenance facilities, and manufacturing environments.

Key Features

• 45-degree helix angle promotes upward chip evacuation, reducing chip packing in blind holes
• TiN coating increases surface hardness and lubricity for extended tap life in ferrous materials
• Vanadium high-speed steel construction provides toughness across a broad range of steel grades
• Modified bottoming chamfer allows threading to near the bottom of a blind hole
• H3 thread limit and 2B class of fit meet standard assembly tolerance requirements
• Right-hand thread and right-hand flute for use with conventional tapping setups

Compatibility

Designed for threading 12-24 UNC holes in alloy steel, cast iron, high-carbon steel, low-carbon steel, medium-carbon steel, and stainless steel workpieces. Compatible with standard tap holders and wrenches sized for a 0.22-inch shank diameter.

Installation Notes

This tap should be installed and used by qualified machinists or maintenance technicians familiar with tapping speeds, feeds, and cutting fluid requirements for the workpiece material. Always ensure the tap is properly aligned with the pilot hole before beginning the threading operation to avoid tap breakage. Use an appropriate cutting fluid or tapping compound for the workpiece material, particularly when working with stainless steel. Secure the workpiece fully before tapping, and reverse the tap periodically to break chips when working in deep or blind holes.