Hertel K008643AS Straight Flute Tap 1-14 Uns Hss

Product Description

The HERTEL K008643AS is a straight flute tap designed to cut unified national special (UNS) internal threads in a 1-14 thread size. Built from high speed steel (HSS) with a bright uncoated finish, this tap delivers consistent thread form in ferrous and non-ferrous workpiece materials. It features a plug chamfer for starting in through-holes or moderately deep blind holes, a 3B class of fit for standard tolerance internal threads, and an H4 thread limit for controlled pitch diameter. Overall length is 5.125 inches. The right-hand cutting direction and 4-flute configuration suit general-purpose threading on manual or CNC machine tools in production and maintenance environments.

This tap is intended for use in machine shop, maintenance, repair, and manufacturing operations requiring a 1-14 UNS thread form. The plug chamfer style makes it appropriate for through-hole applications and for starting threads in blind holes when sufficient depth is available. It is suited for machinists, tool and die makers, and maintenance technicians working with standard threading equipment such as drill presses, mills, lathes, and dedicated tapping machines.

Key Features

• 1-14 UNS thread size and form for unified national special applications
• High speed steel construction for durability across a range of workpiece materials
• Plug chamfer allows reliable thread starting in through-holes and moderate-depth blind holes
• 4 straight flutes support chip evacuation in shorter-chipping materials
• 3B class of fit provides standard tolerance internal threading
• H4 thread limit for controlled pitch diameter accuracy
• Bright uncoated finish — no coating buildup to affect thread form

Compatibility

Designed as a standard machine tap for use in any 1-14 UNS threaded application requiring a plug chamfer, 3B fit, and H4 thread limit with straight flute geometry.

Installation Notes

This tap is installed by qualified machinists using compatible tap holders, floating holders, or rigid tapping attachments on machine tools. Ensure the spindle and workpiece are fully secured before beginning the tapping cycle. Apply appropriate cutting fluid for the workpiece material to promote tool life and thread quality. Inspect the tap for wear or chipping before each use; a damaged tap can produce out-of-tolerance threads or break in the workpiece.