Guhring 9039970054860 Spiral Point Tap 12-28 Unf Tin

Product Description

The GUHRING 9039970054860 is a spiral point plug tap designed for through-hole threading in metalworking applications. It cuts a 12-28 UNF right-hand thread to a Class 3B fit with an H3 thread limit, making it suitable for close-tolerance fastener holes. The tap is manufactured from powdered metal and coated with titanium nitride (TiN) for improved wear resistance and tool life. With 3 flutes and a plug chamfer, it pushes chips forward ahead of the cutting zone, keeping the flutes clear during production threading operations. Overall length is 2.382 inches with a shank diameter of 0.220 inches.

This tap is intended for through-hole threading in stainless steel and similarly challenging materials. The TiN coating helps manage heat buildup and reduces galling when cutting harder alloys. The plug chamfer style provides a gradual lead-in, distributing cutting load across several threads before reaching full thread form. It is suited for use in machine tapping setups such as CNC machining centers, drill presses with tapping attachments, and semi-automatic tapping heads in production environments.

Key Features

• 12-28 UNF thread form, Class 3B fit, H3 thread limit for close-tolerance work
• Spiral point design pushes chips forward — optimized for through-hole applications
• Powdered metal construction for higher hardness and wear resistance compared to standard HSS
• TiN coating reduces friction and extends tool life in stainless steel and hard alloys
• Plug chamfer distributes cutting load gradually for smooth machine tapping entry
• Right-hand thread direction, no coolant-through requirement

Compatibility

Designed for through-hole threading in stainless steel workpieces requiring a 12-28 UNF thread. Fits standard tapping chucks and collet holders accepting a 0.220-inch shank diameter.

Installation Notes

This tap should be installed and operated by a qualified machinist or tooling professional. Secure the tap in a floating or rigid tapping chuck appropriate for the machine spindle in use. Ensure the workpiece is clamped securely and the pilot hole diameter is correct for the specified thread size and class of fit before beginning the tapping cycle. Use appropriate cutting fluid or tapping compound for stainless steel to prevent galling and premature tool wear.