Hertel K008541AS Straight Flute Tap 7/16-20 Unf Bottoming Hss

Product Description

The HERTEL K008541AS is a straight flute bottoming tap designed for cutting right-hand internal threads in pre-drilled holes. Built from high-speed steel with a bright, uncoated finish, this tap produces 7/16-20 UNF threads and is configured with 3 flutes for efficient chip evacuation in through and blind-hole applications. The bottoming chamfer allows threading to the very bottom of a blind hole, making it the correct choice when full thread depth is required close to the floor of a bore. With an overall length of 3-5/32 inches and a thread length of 1-7/16 inches, it fits standard tap handles and machine setups used in maintenance, repair, and manufacturing work.

This tap is suited for use in machine shops, maintenance facilities, and field repair environments where UNF fine-pitch threads are required. Straight flute geometry performs reliably in shorter-chipping materials such as cast iron, brass, and free-machining steel. The bottoming configuration is typically used as the third tap in a tap set sequence, following a taper and plug tap, or as a standalone tool when threading to depth in a blind hole is the primary objective. It is appropriate for both hand tapping and low-speed machine tapping setups.

Key Features

• Bottoming chamfer allows threading to full depth in blind holes
• 7/16-20 UNF right-hand thread form for fine-pitch applications
• 3 straight flutes for chip clearance in short-chipping materials
• High-speed steel construction provides hardness and wear resistance at moderate cutting speeds
• H3 thread limit for consistent tolerance fit in standard UNF applications
• Bright uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as a standard replacement or direct-use bottoming tap for any application requiring 7/16-20 UNF right-hand internal threads with an H3 thread limit.

Installation Notes

Always secure the workpiece before tapping and use an appropriate cutting fluid for the material being threaded. Ensure the tap is aligned perpendicular to the work surface before applying torque to avoid tap breakage or thread distortion. For hand tapping, use a proper tap handle sized for this shank diameter. Power down any machine tool and follow lockout procedures before changing or setting taps in a machine spindle.