Hertel K008691AS 1-1/2-12 Unf Straight Flute Tap Hss

Product Description

The HERTEL K008691AS is a straight-flute tap designed for cutting 1-1/2-12 UNF internal threads in a variety of workpiece materials. Built from high speed steel with a bright/uncoated finish, this tap produces right-hand threads to a 3B class of fit with an H4 thread limit. The plug chamfer style provides a gradual lead-in over several threads, making it well-suited for through-hole applications where chip clearance is not a primary concern. At 6-3/8 inches overall length and featuring 6 flutes, it delivers excellent thread form consistency on larger-diameter fastener holes common in heavy-duty mechanical and structural assemblies.

This tap is intended for use in machine tapping or hand tapping operations on through holes requiring a 1-1/2-12 UNF thread form. It is appropriate for use in manufacturing, maintenance, and repair applications across industries such as industrial machinery, hydraulic equipment, and structural fabrication. The 6-flute configuration helps distribute cutting load evenly, reducing deflection on larger-diameter taps. Machinists, toolroom technicians, and maintenance mechanics working with rigid tapping setups or tap handles will find this tool applicable to production and repair threading tasks.

Key Features

• 1-1/2-12 UNF thread form for fine-pitch, large-diameter internal threading
• High speed steel construction provides durability across a wide range of ferrous and non-ferrous materials
• Plug chamfer with 6-flute design for balanced cutting load on through-hole applications
• 3B class of fit and H4 thread limit for standard tolerance internal threads
• Bright/uncoated finish suitable for general-purpose threading without added coating cost
• Right-hand thread direction, 6-3/8 inches overall length for reach in standard setups

Compatibility

Designed as a standard replacement or direct-use tap for machine tapping and hand tapping operations requiring a 1-1/2-12 UNF internal thread on through-hole workpieces.

Installation Notes

This tap should be installed and operated by qualified machinists or toolroom technicians familiar with threading procedures and cutting tool safety. Ensure the workpiece is securely fixtured and the spindle or tap handle is properly aligned before beginning the threading operation. Apply an appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Do not reverse-feed without first relieving cutting pressure, and inspect flutes for chip buildup between passes on deeper holes.