Hertel K008430AS Straight Flute Tap 3/8-16 Unc Hss

Product Description

The HERTEL K008430AS is a straight flute hand tap designed to cut 3/8-16 UNC internal threads in through-holes and blind holes requiring a bottoming chamfer. Manufactured from high-speed steel (HSS) with a bright, uncoated finish, this tap delivers reliable thread-cutting performance in a wide range of workpiece materials. The 4-flute configuration provides stability during cutting and adequate chip clearance for standard applications. With an overall length of 2-15/16 inches and a thread length of 1-1/4 inches, this tap suits general-purpose machine shop, maintenance, and field repair threading tasks. The H1 thread limit indicates a tight tolerance class suitable for standard UNC fits.

This tap is used in machine shop production, MRO maintenance, and field repair applications where 3/8-16 UNC bottoming threads are required. The bottoming chamfer allows threading to within 1-2 threads of the bottom of a blind hole, making it appropriate for setups where full thread depth close to the hole bottom is necessary. Machinists, millwrights, and maintenance technicians working in manufacturing, fabrication, and industrial maintenance environments are the typical end users. It is used as a hand tap or in low-speed machine tapping operations.

Key Features

• 3/8-16 UNC thread form with right-hand thread direction
• Bottoming chamfer allows threading close to the bottom of blind holes
• 4-flute straight flute design provides cutting stability and chip clearance
• High-speed steel construction for durability across common workpiece materials
• H1 thread limit for tight-tolerance standard UNC thread fits
• Bright, uncoated finish suitable for general-purpose threading applications

Compatibility

Designed for cutting 3/8-16 UNC right-hand internal threads; compatible with standard 3/8-16 tap holders, T-handle wrenches, and low-speed tapping chucks accepting a 0.381-inch shank diameter.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a tap wrench or appropriate tapping chuck. Always drill to the correct tap drill size for 3/8-16 UNC threads before tapping, and ensure the workpiece is securely fixtured. Apply appropriate cutting fluid to extend tap life and improve thread quality. For blind-hole applications, use a plug tap first to establish thread depth before switching to this bottoming tap to complete the thread.