Hertel K010389AS25 Thread Forming Tap 3/8-16 Unc Plug Hss Tin

Product Description

The HERTEL K010389AS25 is a thread forming tap designed for right-hand, through-hole threading in 3/8-16 UNC applications. Manufactured from high-speed steel (HSS) with a titanium nitride (TiN) coating, it delivers improved wear resistance and longer tool life compared to uncoated taps. The plug chamfer provides 3 to 5 chamfered threads for controlled thread entry. With an overall length of 2.9375 inches and a thread length of 1.25 inches, this tap suits standard tooling setups. It carries a 2B class of fit and H5 thread limit, making it appropriate for general-purpose threaded fastener applications in metal fabrication and maintenance environments.

This tap is suited for through-hole threading operations in production and maintenance settings across manufacturing, industrial, and mechanical service trades. The 3/8-16 UNC thread form is one of the most common coarse-thread sizes in North American fastener applications, making this tap a standard toolroom and field-service item. The TiN coating reduces friction during the forming process, which is particularly useful in higher-volume tapping operations or when working with ductile materials.

Key Features

• 3/8-16 UNC thread size with right-hand thread direction
• 2B class of fit and H5 thread limit for standard tolerance threading
• Plug chamfer with 3 to 5 chamfered threads for controlled thread engagement
• High-speed steel construction for durability in general metalworking applications
• Titanium nitride coating improves wear resistance and reduces friction
• Through-hole threading application with no coolant-through requirement

Compatibility

Designed for through-hole threading in 3/8-16 UNC applications using standard tap holders and tapping machines compatible with the 0.381-inch shank diameter and 0.286-inch square drive size.

Installation Notes

This tap should be installed by a machinist or qualified maintenance technician using a tap wrench, tapping head, or CNC tapping attachment rated for the shank diameter. Ensure the workpiece is securely fixtured before threading. Use an appropriate cutting fluid or tapping compound for the base material to extend tool life. Inspect the tap for wear or chipping before each use and replace if thread quality degrades.