Guhring 9039170054860 Spiral Point Tap 12-28 Unf Tin Hss-e

Product Description

The GUHRING 9039170054860 is a spiral point tap designed for right-hand through-hole threading in steel and similar materials. Built from HSS-E cobalt high-speed steel and finished with a TiN (titanium nitride) coating, it delivers extended tool life in production and maintenance threading applications. The plug chamfer provides a gradual lead-in that distributes cutting forces across multiple threads, reducing the risk of tap breakage at entry. With a 12-28 UNF thread form, 3 flutes, and an H3/H4 thread limit, this tap suits precision threading where a 2B class of fit is required. Machinists, toolroom technicians, and maintenance mechanics use this tap in drill press, CNC, and hand-tapping setups.

This tap is suited for through-hole threading operations on steel workpieces in both production shop and MRO environments. The spiral point geometry pushes chips forward ahead of the tap, making it effective in through-hole applications where chip evacuation out the back of the hole is practical. The 12-28 UNF thread size is common in instrument hardware, fastener assemblies, and precision mechanical components. The 2B class of fit provides standard tolerance for general-purpose threaded assemblies. This tap is appropriate for use in CNC tapping cycles, drill press setups with tapping attachments, and controlled hand-tapping operations.

Key Features

• HSS-E cobalt construction for improved heat and wear resistance compared to standard HSS
• TiN coating reduces friction and extends cutting life in steel applications
• Plug chamfer with 3-5 thread lead-in distributes entry cutting load gradually
• Spiral point geometry pushes chips forward, optimized for through-hole threading
• H3/H4 thread limit suits standard 2B class of fit requirements
• Right-hand thread direction for conventional tapping operations

Compatibility

Designed for through-hole threading of 12-28 UNF threads in steel. Compatible with standard tapping chucks and quick-change tapping attachments that accept a 0.220-inch shank diameter. Series 3917.

Installation Notes

This tap should be installed by a qualified machinist or maintenance technician familiar with tapping operations and cutting tool safety. Ensure the workpiece is securely fixtured and the machine spindle is powered down before loading the tap into the chuck. Use an appropriate cutting fluid or tapping compound rated for the workpiece material to reduce heat buildup and extend tool life. Follow the machine manufacturer and tooling supplier recommendations for spindle speed and feed rate for the tap diameter and material being threaded.