Hertel K014647AS Straight Flute Tap 1-8 Unc Hss

Product Description

The HERTEL K014647AS is a straight flute tap designed to cut 1-8 UNC internal threads in a wide range of materials. Built from high-speed steel (HSS) with a bright uncoated finish, it is suited for general-purpose tapping applications where coolant-through tooling is not required. The plug chamfer — typically 3 to 5 threads of lead — makes it appropriate for through holes and blind holes with sufficient thread runout. With a 5.125-inch overall length and a 2.5-inch thread length, this tap accommodates deeper threading passes. The H11 thread limit designates an oversize tolerance class, with an oversize value of 0.0050 inches, which is specified for applications requiring a controlled fit allowance in the finished thread.

This tap is intended for use in machine shops, maintenance and repair operations, and production environments where 1-8 UNC threads are required. The right-hand cut and straight flute geometry make it compatible with conventional CNC machining centers, drill presses, and tapping machines. It is commonly used when threading steel, cast iron, aluminum, and similar machinable materials in sizes requiring a 1-inch nominal diameter thread. Licensed machinists and tooling specialists handling large-diameter threading operations are the primary installers of this tooling.

Key Features

• 1-8 UNC thread form with right-hand cut for standard unified coarse thread applications
• High-speed steel construction provides durability across a range of machinable materials
• Plug chamfer geometry suitable for through holes and blind holes with adequate runout depth
• H11 thread limit with 0.0050-inch oversize for controlled thread fit tolerance
• Straight flute design compatible with CNC machining centers and standard tapping equipment
• Bright uncoated finish — no additional coating to affect thread tolerance calculations

Compatibility

Designed as a standard replacement or production tap for applications requiring 1-8 UNC right-hand threads. Compatible with tap holders and collet chucks sized for a 0.800-inch shank diameter and a 0.600-inch square drive.

Installation Notes

This tap should be installed by a qualified machinist following standard tapping procedures for large-diameter tooling. Ensure the workpiece is securely fixtured and the tap is properly aligned with the pilot hole before engaging the cut. Recommended practice is to use appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality, even though this tap does not feature coolant-through capability. Power down or de-energize the machine spindle before loading or removing the tap from the holder.