Hertel K017051AS Spiral Point Tap 8-32 Unc Left Hand Hss

Product Description

The HERTEL K017051AS is a spiral point tap designed to cut internal threads in through-hole applications. It features an 8-32 UNC thread form with a plug chamfer, making it suited for starting in a hole that passes fully through the workpiece. The left-hand thread direction produces threads that tighten counterclockwise, a requirement for specific fastener and assembly configurations. Manufactured from high-speed steel with a bright, uncoated finish, this tap operates in a 2-flute, 2B class of fit configuration with an H3 thread limit, providing standard tolerance threading for general-purpose mechanical assembly work. Machinists and tool-and-die tradespeople are the primary installers.

This tap is used in machine shop, maintenance, and light manufacturing environments where 8-32 UNC left-hand internal threads are required. Typical applications include thread repair, fixture fabrication, and assembly of components that require reverse-threaded fasteners to prevent loosening under rotational loads. The plug chamfer style requires a through-hole or sufficient clearance at the bottom of a blind hole. It is not intended for blind-hole bottoming applications without a bottoming tap follow-up.

Key Features

• Left-hand thread direction for reverse-threaded fastener applications
• 8-32 UNC thread form with H3 thread limit for standard 2B tolerance class
• Plug chamfer allows smooth entry into through-holes
• High-speed steel construction provides durability across a range of workpiece materials
• Bright, uncoated finish suitable for use with cutting fluids
• 2-flute spiral point design pushes chips forward through the hole during cutting

Compatibility

Designed as an OEM-style replacement or direct-use spiral point tap for any application requiring an 8-32 UNC, 2B class of fit, left-hand internal thread in through-hole configurations.

Installation Notes

This tap is installed by machinists using a tap wrench, tapping head, or CNC tapping cycle. Secure the workpiece before tapping and ensure the hole is drilled to the correct tap drill diameter for 8-32 UNC threads. Apply an appropriate cutting fluid for the workpiece material to reduce friction and extend tap life. Inspect the tap for wear or chipping before each use, as a damaged tap can seize in the hole and cause workpiece damage.