Guhring 9039160285750 Spiral Point Tap 1-1/8-7 Unc

Product Description

The GUHRING 9039160285750 is a spiral point tap designed for through-hole threading applications in a wide range of ferrous and non-ferrous materials. It cuts a 1-1/8-7 UNC thread with a right-hand direction and a plug chamfer, making it well suited for initiating threads in through-hole workpieces. Built from cobalt high-speed steel and coated with titanium nitride (TiN), the tap delivers improved wear resistance and heat tolerance compared to standard HSS tooling. The 4-flute geometry and H6/H7 thread limit hold a Class 2B fit tolerance. Overall length is 5.441 inches, with a shank diameter of 0.896 inches. Machinists and toolroom professionals install this tap in CNC machining centers, turret lathes, or manual drill presses equipped with a tapping head.

This tap is intended for through-hole threading in production and job-shop environments. The TiN coating reduces built-up edge and extends tool life when running at elevated speeds. Rated material applications include aluminum, gray cast iron, malleable iron, spheroidal iron, non-ferrous metals, stainless steel, and steel, making it a versatile choice across general metalworking operations. The plug chamfer — typically 3 to 5 lead threads — allows the tap to start easily in a through-hole without requiring a bottoming or semi-bottoming profile. This is a GUHRING Series 3916 tap.

Key Features

• 1-1/8-7 UNC thread form with right-hand cutting direction
• Cobalt HSS construction for improved heat and wear resistance over standard HSS
• TiN coating reduces friction and extends tool life in ferrous and non-ferrous materials
• 4-flute spiral point design pushes chips forward, ideal for through-hole applications
• H6/H7 thread limit holds Class 2B fit tolerance
• Overall length of 5.441 inches; shank diameter of 0.896 inches

Compatibility

Designed for through-hole threading operations across aluminum, gray cast iron, malleable iron, spheroidal iron, non-ferrous metals, stainless steel, and steel. Part of the GUHRING Series 3916 tap line.

Installation Notes

Installation is performed by machinists or toolroom technicians using a tapping head, tap wrench, or CNC rigid tapping cycle. Ensure the workpiece is securely fixtured and the spindle is properly aligned before starting. Use appropriate cutting fluid for the workpiece material to reduce heat and extend tap life. Inspect the tap and holder for runout before use, as misalignment is a leading cause of tap breakage at larger diameters.