Hertel K008684AS 1-1/2-6 Unc Straight Flute Tap Hss

Product Description

The HERTEL K008684AS is a straight flute tap designed for cutting 1-1/2-6 UNC internal threads in a range of workpiece materials. Built from high speed steel with a bright uncoated finish, this tap delivers reliable thread-forming performance in production and maintenance environments. It carries a taper chamfer for gradual thread engagement on entry, reducing the load on the cutting edges at the start of the cut. The 4-flute geometry provides balanced chip control and rigidity across the full 6.375-inch overall length. Machinists and toolroom technicians use this tap for through-hole and blind-hole applications requiring a Class 3B fit with an H4 thread limit.

This tap is suited for threading operations on ferrous metals, cast iron, and similar machinable materials where a straight flute design is preferred. The taper chamfer makes it a standard choice for starting threads in through-holes or pre-drilled holes where the tap can be driven fully through the workpiece. It is appropriate for both manual tapping and machine tapping setups in general manufacturing, job shop, MRO, and industrial maintenance applications. The right-hand thread direction and UNC specification match the most common fastener standard used in North American trade and manufacturing work.

Key Features

• 1-1/2-6 UNC thread size for large-diameter internal threading
• Taper chamfer provides gradual entry and reduced starting torque
• 4-flute straight design offers rigidity and stable chip evacuation
• High speed steel construction handles a wide range of machinable materials
• Bright uncoated finish suitable for use with standard cutting fluids
• H4 thread limit and Class 3B fit for standard tolerance threading

Compatibility

Designed as a standard-geometry replacement tap for 1-1/2-6 UNC through-hole threading applications compatible with common tap holders and machine spindles accepting large-shank straight flute taps.

Installation Notes

This tap is installed and operated by machinists or toolroom technicians using a tap wrench, tapping head, or CNC/manual machine spindle. Always verify the pre-drilled hole diameter against the recommended tap drill size for 1-1/2-6 UNC before beginning. Apply appropriate cutting fluid throughout the operation to extend tool life and maintain thread quality. Inspect the tap for wear or chipping between uses and never force a tap that has stalled in the hole.