Guhring 9039830063500 Spiral Point Tap 1/4-28 Unc

Product Description

The GUHRING 9039830063500 is a spiral point tap designed for through-hole threading in a wide range of ferrous and non-ferrous materials. Built from cobalt high-speed steel and finished with a titanium nitride (TiN) coating, it delivers extended tool life in demanding production and maintenance environments. The plug chamfer style provides gradual thread engagement, making it well suited for through-hole applications where the tap can advance without bottoming out. With a 1/4-28 UNC thread form, 3 flutes, and an H7 thread limit, this tap is a reliable choice for machinists, maintenance technicians, and tool-room professionals who need precise, repeatable thread quality.

This tap is intended for through-hole threading operations on a broad material spectrum including aluminum, gray cast iron, malleable iron, spheroidal iron, non-ferrous metals, stainless steel, and steel. It fits standard tapping chucks and tap handles sized for a 0.255-inch shank diameter. The 2.5-inch overall length provides adequate reach for most general-purpose setups on drill presses, CNC machining centers, and manual tapping arms. Its cobalt construction makes it particularly effective when working with tougher alloys and stainless steel grades that cause accelerated wear on standard HSS tooling.

Key Features

• Cobalt high-speed steel construction for increased hardness and heat resistance in tough materials
• TiN coating reduces friction and extends tool life across a wide range of workpiece materials
• Plug chamfer style with 3 flutes optimized for through-hole threading applications
• H7 thread limit with 0.003-inch oversize allowance for consistent fit and thread accuracy
• Right-hand thread direction, 1/4-28 UNC form, compatible with standard tapping toolholders
• No coolant-through requirement simplifies setup in manual and standard CNC environments

Compatibility

Designed as an OEM-style replacement spiral point tap suitable for through-hole threading operations in machine shops, maintenance facilities, and production environments using standard 1/4-28 UNC thread specifications.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with tapping procedures. Always secure the workpiece firmly and ensure proper alignment between the tap and the pilot hole before engagement. Power down or disengage the tapping spindle before loading or removing the tap from the holder. Follow applicable workplace safety standards for cutting tool handling and use appropriate cutting fluid for the workpiece material to maximize tap life and thread quality.