Hertel K010390AS25 Thread Forming Tap 3/8-16 Unc 2B Bottoming

Product Description

The HERTEL K010390AS25 is a bottoming-style thread forming tap designed to cut 3/8-16 UNC internal threads to a 2B class of fit. Manufactured from high-speed steel with a titanium nitride (TiN) coating, this tap generates threads by displacing material rather than cutting chips, producing stronger thread forms with better surface finish than cut taps. The TiN coating reduces friction and extends tool life in ferrous and non-ferrous workpiece materials. With an overall length of 2.9375 inches and a thread length of 1.25 inches, it is sized for standard machine tool spindles and tapping heads. Installed by machinists and tool-and-die professionals in production and maintenance environments.

This tap is suited for blind hole threading applications where chip evacuation is a concern and thread forming is preferred over thread cutting. The bottoming chamfer with 1 to 2 chamfered threads allows the tap to thread close to the bottom of a blind hole, maximizing thread engagement depth. Typical applications include threading tapped holes in steel, aluminum, and other ductile metals in both job shop and production machining settings. Right-hand thread direction is standard for conventional tapping operations.

Key Features

• Bottoming chamfer with 1 to 2 chamfered threads for threading to the bottom of blind holes
• High-speed steel construction provides toughness and wear resistance across a range of workpiece materials
• Titanium nitride coating reduces friction and extends tool life
• Thread forming design displaces material for stronger threads and no chip generation
• H5 thread limit for precise tolerance control on 2B class of fit threads
• Right-hand thread direction for standard tapping operations

Compatibility

Designed as an OEM-style replacement or direct tooling selection for 3/8-16 UNC blind hole threading applications requiring a 2B class of fit and bottoming chamfer in standard machine tool or tapping head setups.

Installation Notes

Installation and use should be performed by qualified machinists following standard tapping procedures. Ensure the workpiece is securely fixtured and the tapping spindle is properly aligned before engaging the tap. Use appropriate cutting or forming fluid for the workpiece material to reduce heat and extend tap life. Inspect the tap for wear or damage before each use and replace if thread form quality degrades.