Guhring 9039990254000 Spiral Flute Tap 1-12 Unf Tin

Product Description

The GUHRING 9039990254000 is a spiral flute tap designed for blind hole threading in demanding materials, including stainless steel. It cuts a 1-12 UNF right-hand thread using four flutes with a 40-degree helix angle, which efficiently evacuates chips back out of the hole during cutting. The modified bottoming chamfer allows threading close to the bottom of a blind hole. Constructed from powdered metal and finished with a TiN coating, this tap is built to handle the higher cutting forces and heat associated with hard-to-machine alloys. Overall length is 5.13 inches. Licensed machinists and tool-room technicians are the primary users.

This tap is suited for precision threading operations in blind holes on components machined from stainless steel and similarly tough materials. The fast flute style and high helix angle make it a practical choice for CNC tapping centers and rigid-tapping setups where chip control in a confined hole is critical. The 3B class of fit produces a standard tolerance thread compatible with general-purpose fastener assemblies.

Key Features

• 1-12 UNF thread form with right-hand flute and right-hand thread direction
• 40-degree helix angle promotes reliable chip evacuation in blind holes
• Modified bottoming chamfer for threading near the bottom of a blind bore
• Powdered metal construction with TiN finish for extended tool life in stainless steel
• 3B class of fit for standard-tolerance thread production
• No coolant-through requirement — compatible with external flood or mist cooling

Compatibility

Designed for blind hole threading applications in stainless steel and other demanding materials. Part of the GUHRING Series 3999 spiral flute tap line.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom technicians familiar with tapping operations. Always ensure the spindle is at a complete stop and the machine is in a safe state before loading or removing the tap from the holder. Use a rigid tapping chuck or a synchronous tapping attachment to maintain proper feed-per-revolution and avoid tap breakage. Follow the machine tool manufacturer and ANSI B94 guidelines for speeds, feeds, and cutting fluid selection appropriate to the workpiece material.