Hertel K013191AS Spiral Point Tap 1-8 Unc Hss Bright

Product Description

The HERTEL K013191AS is a spiral point tap designed for cutting right-hand internal threads in through-hole applications. Built from high speed steel with a bright finish, this tap produces 1-8 UNC threads and is suited for use in ferrous and non-ferrous materials where threading accuracy and tool longevity are priorities. The plug chamfer allows for gradual thread engagement, reducing cutting force at entry. With 3 flutes and an H4 thread limit, it meets Class 3B fit tolerances, making it appropriate for close-tolerance threaded assemblies. Machinists, tool-and-die workers, and maintenance technicians rely on this tap for both production and repair threading operations.

This tap is intended for through-hole threading in materials including steel, aluminum, and cast iron at the 1-8 UNC coarse-thread standard. The spiral point geometry pushes chips forward ahead of the tap, keeping flutes clear and reducing the risk of chip packing in production environments. It is commonly used in manual tapping, drill press setups, and CNC tapping cycles where through-hole clearance is available. The H4 thread limit and 3B class of fit make this tap appropriate for standard commercial and precision fastener applications.

Key Features

• 1-8 UNC coarse thread standard for broad fastener compatibility
• High speed steel construction provides wear resistance in a wide range of materials
• Plug chamfer with 3-5 thread lead for smooth entry and reduced starting force
• Spiral point geometry pushes chips forward, ideal for through-hole applications
• H4 thread limit meets Class 3B fit tolerances for close-tolerance assemblies
• Bright finish for general-purpose use without added coating

Compatibility

Designed as a standard replacement or production spiral point tap for 1-8 UNC through-hole threading operations in manual and machine tapping applications.

Installation Notes

This tap is installed by a machinist or maintenance technician using a tap wrench, tapping fixture, or CNC rigid tapping setup. Ensure the workpiece is securely clamped and the tap is properly aligned before engagement to prevent tap breakage. Use an appropriate cutting fluid for the material being threaded. Always verify that sufficient through-hole clearance exists before using a spiral point tap, as chip ejection requires an open exit path.