Guhring 9043730028450 Spiral Flute Tap Unc Bottoming Ticn

Product Description

The GUHRING 9043730028450 is a spiral flute tap designed for threading blind holes in a range of materials, including hardened steel. It cuts a 4-40 UNC thread with a right-hand flute and right-hand thread orientation, driven by a 15-degree helix angle and a slow flute style suited to controlled chip evacuation in deep or restricted cavities. The bottoming chamfer allows threading close to the bottom of a blind hole, making it the right tool when full thread depth is required in tight spaces. Class of fit is 2BX, supported by thread limits H3 and H4. The TiCN coating extends tool life when cutting abrasive or hardened workpiece materials. Machinists and toolroom technicians working in production or maintenance environments are the primary users.

This tap is used for blind hole threading operations on 4-40 UNC threaded features in ferrous and hardened steel components. It is well-suited for CNC tapping centers, manual drill presses with tapping attachments, and bench tapping setups where precise depth control is essential. The bottoming chamfer style is selected when through-tapping is not possible and maximum thread engagement depth is required. Applications span precision machining, maintenance repair, and OEM production work.

Key Features

• Bottoming chamfer for maximum thread depth in blind holes
• TiCN coating for improved wear resistance on hardened steel and abrasive materials
• High-speed steel construction provides toughness across a range of cutting conditions
• 15-degree helix angle with slow flute style for controlled chip flow
• Thread limits H3 and H4 support 2BX class of fit tolerances
• Coolant-through: No — compatible with standard flood or mist coolant delivery

Compatibility

Designed for cutting 4-40 UNC right-hand threads in blind hole applications on hardened steel and similar ferrous materials. Part of GUHRING Series 4373.

Installation Notes

This tap is installed and operated by machinists or tool and die technicians using a tap wrench, tapping head, or CNC rigid tapping cycle. Before use, ensure the drilled hole diameter and depth are correct for the 4-40 UNC thread specification being cut. Secure the workpiece fully before tapping to prevent movement under torque. Follow the tap manufacturer's recommended cutting fluid or coolant type for the workpiece material to maximize tool life and thread quality.