Hertel K008427AS Straight Flute Tap 3/8-16 Unc Hss

Product Description

The HERTEL K008427AS is a straight flute tap designed to cut 3/8-16 UNC internal threads in a wide range of workpiece materials. Built from high-speed steel with a bright, uncoated finish, this tap delivers consistent thread form on through-hole and blind-hole applications in production and maintenance environments. The taper chamfer eases entry and distributes cutting forces gradually across the lead threads, reducing the risk of tap breakage on manual or machine-driven operations. With a thread length of 1.25 inches and an overall length of 2.9375 inches, it fits standard tap holders and is suited for use in drill presses, CNC machining centers, and hand tapping setups. A right-hand thread direction and H2 thread limit ensure dimensional accuracy within standard tolerance requirements.

This tap is used in metalworking, MRO, and light manufacturing applications where 3/8-16 UNC fastener threads are required. Common materials include mild steel, aluminum, brass, and similar machinable metals. The taper chamfer style makes it appropriate as the first tap in a sequence or as a standalone tap in through-hole applications with adequate chip clearance. It is used by machinists, maintenance technicians, and tool and die professionals in both shop and field settings.

Key Features

• 3/8-16 UNC thread form with right-hand thread direction
• Taper chamfer for gradual thread engagement and reduced entry force
• High-speed steel construction for durability across common machinable metals
• H2 thread limit for tight dimensional control within standard tolerance class
• 4 straight flutes for chip evacuation in through-hole applications
• Bright, uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as a standard replacement or new-stock straight flute tap for 3/8-16 UNC threading operations in manual and machine tapping applications.

Installation Notes

This tap should be installed in a properly sized tap holder or chuck rated for the shank diameter before use. Always apply appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill size for 3/8-16 UNC threads before starting. Reverse the tap periodically during hand tapping to break chips and prevent binding.