Hertel K008487AS Spiral Flute Tap 7/16-14 Unc Hss

Product Description

The HERTEL K008487AS is a spiral flute tap designed to cut internal threads in through-holes and blind holes where chip evacuation is a priority. Built from high speed steel (HSS), it produces a 7/16-14 UNC thread profile with a plug chamfer for gradual thread engagement. The 52-degree helix angle drives chips forward and out of the hole, reducing clogging in materials like aluminum, stainless, and mild steel. The H3 thread limit holds tight tolerance for consistent fitment with standard UNC fasteners. This tap is a standard tool for machinists, maintenance technicians, and fabricators working in production or repair environments.

This tap is suited for threading 7/16-14 UNC holes in ferrous and non-ferrous metals where a right-hand thread is required. The plug chamfer makes it appropriate for both through-holes and holes with sufficient depth for the chamfer lead. The fast spiral flute style improves chip flow in interrupted cuts and deep-hole applications. It is used in manual tapping operations, CNC machining centers, and drill-press setups where torque and feed can be controlled. The 3-flute configuration balances chip room with core strength.

Key Features

• 7/16-14 UNC thread form with H3 tolerance limit for precise thread fit
• 52-degree helix angle promotes forward chip ejection in through-hole applications
• Plug chamfer provides gradual thread engagement over several leading threads
• High speed steel construction withstands heat generated in ferrous and non-ferrous cutting
• Right-hand flute and right-hand thread orientation for standard tapping direction
• 3-flute design balances chip clearance with tool body strength

Compatibility

Designed as a standard UNC spiral flute tap for use in manual tap handles, tapping heads, and CNC rigid-tap toolholders sized for the 7/16-14 shank profile.

Installation Notes

Spiral flute taps are installed by machinists and tool-and-die technicians using appropriate tap holders or collets. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for a 7/16-14 UNC thread before tapping. Apply cutting fluid appropriate to the workpiece material to reduce heat and extend tool life. Do not reverse-cycle the tap excessively in blind holes, as chip packing can cause tap breakage.