Hertel G859445 Extension Tap 10-24 Unc Spiral Point Hss

Product Description

The HERTEL G859445 is a spiral point plug extension tap designed for cutting 10-24 UNC threads in through-hole applications. Built from high speed steel with a bright uncoated finish, this tap is suited for general-purpose tapping operations where extended reach is required. The spiral point geometry pushes chips ahead of the cut, reducing clogging and improving thread quality in through-hole work. With a 6-inch overall length, a reduced shank, and an H3 thread limit, it delivers consistent sizing for 2B and 3B class of fit tolerances. Machinists and tool and die shops rely on taps like this for production and maintenance work on standard UNC fastener threads.

This tap is intended for right-hand 10-24 UNC threading in through-hole setups across a range of materials typical for high speed steel tooling. The 6-inch overall length provides clearance in deep or obstructed workpiece setups where a standard-length tap cannot reach. The plug chamfer allows the tap to start cutting partway down the lead threads, making it well suited for through-holes rather than blind holes. Two flutes keep chip volume manageable and are appropriate for a tap of this thread size and pitch.

Key Features

• Spiral point geometry pushes chips forward for cleaner through-hole threading
• 6-inch overall length for extended reach in deep or obstructed setups
• H3 thread limit for 2B and 3B class of fit tolerances
• Plug chamfer for reliable entry in through-hole applications
• Reduced shank for compatibility with standard tap holders and chucks
• Bright uncoated finish suitable for general-purpose tapping operations

Compatibility

Designed as an OEM-style replacement or direct-use tap for standard 10-24 UNC through-hole tapping applications. Fits tap holders and chucks sized for the reduced shank diameter of this thread size.

Installation Notes

This tap should be installed by a qualified machinist using an appropriate tap handle, tapping head, or CNC spindle rated for the shank size. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill size for 10-24 UNC before use. Apply cutting fluid appropriate for the workpiece material to extend tool life and improve thread finish. Never force a tap against resistance, as this can result in breakage and damage to the workpiece.