Hertel K008549AS25 Spiral Point Tap 9/16-18 Unf Tin

Product Description

The HERTEL K008549AS25 is a spiral point tap designed for cutting right-hand internal threads in through-hole applications. Built from high speed steel with a titanium nitride (TiN) coating, this tap delivers extended tool life and reduced friction during threading operations. The 9/16-18 UNF thread form and H3 thread limit make it suitable for close-tolerance work in ferrous and non-ferrous materials. Three flutes and a plug chamfer geometry push chips forward ahead of the cutting edge, keeping the flutes clear and reducing the risk of chip packing in moderate-depth through holes. Machinists and maintenance technicians reach for this tap when threading medium-to-large diameter fine-pitch fastener holes in production and repair environments.

This tap is intended for through-hole threading operations where chips can exit freely ahead of the tap. The 9/16-18 UNF specification is common in precision mechanical assemblies, hydraulic fittings, and structural fastener applications requiring a fine-thread pitch. The plug chamfer lead makes it suitable for starting in a pre-drilled hole without requiring a bottoming or taper starter. It is not designed for coolant-through tooling setups. Typical use includes manual hand-tapping with a tap wrench or machine-tapping in a drill press, CNC machining center, or tapping arm at controlled feed rates.

Key Features

• 9/16-18 UNF right-hand thread form for fine-pitch through-hole applications
• High speed steel construction provides toughness and re-sharpenability
• TiN coating reduces friction and extends tool life compared to uncoated HSS
• Plug chamfer lead allows clean entry into pre-drilled through holes
• H3 thread limit supports close-tolerance fits in production threading
• 3-flute spiral point geometry pushes chips forward to prevent packing

Compatibility

Designed as a standard UNF spiral point tap for use in any through-hole application requiring a 9/16-18 right-hand internal thread. Compatible with standard tap holders and collet chucks sized for the appropriate shank diameter.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench, tapping arm, or rigid tap holder in a machine tool. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for 9/16-18 UNF before starting. Apply cutting fluid appropriate for the workpiece material to reduce heat and improve thread finish. Inspect the tap for chipping or wear before each use, and never force a tap that has seized, as high speed steel is brittle under torsional overload.