Hertel K010452AS25 Thread Forming Tap M4x0.7 Metric

Product Description

The HERTEL K010452AS25 is a metric thread forming tap designed to produce internal M4x0.7 threads in ductile materials without cutting chips. Manufactured from high-speed steel with a titanium nitride coating, this plug-style tap generates threads by cold-forming the workpiece material, which results in stronger thread walls and eliminates chip evacuation concerns. The tap measures 2.125 inches overall length with a 0.75-inch thread length, a shank diameter of 0.168 inches, and a square drive size of 0.131 inches. The D6 thread limit designation specifies the tolerance class for the produced thread. It is installed by machinists and tooling technicians in production and maintenance environments.

This tap is suited for through-hole threading applications in metals such as aluminum, mild steel, and other materials with sufficient ductility for cold forming. The plug chamfer, with 3 to 5 chamfered threads, provides a gradual lead-in that works well for through-holes where full thread engagement is needed from entry to exit. It is a common choice in shop environments where thread quality and hole strength are priorities over high-speed blind-hole production.

Key Features

• Thread forming design eliminates chips, reducing clogging risk in through-hole applications
• Titanium nitride coating improves surface hardness and extends tool life
• High-speed steel construction provides toughness across a range of workpiece materials
• Plug chamfer with 3 to 5 chamfered threads for controlled lead-in in through-holes
• D6 thread limit ensures consistent tolerance on formed threads
• Right-hand thread direction, standard for most metric fastener applications

Compatibility

Designed for through-hole threading of M4x0.7 metric threads in ductile workpiece materials. Compatible with standard tap holders and chucks accepting a 0.168-inch shank diameter with a 0.131-inch square drive.

Installation Notes

Thread forming taps require a properly sized forming tap drill hole, which is typically larger than a cutting tap drill - consult a forming tap drill chart for the correct hole size for M4x0.7 before starting. Secure the workpiece completely and use a tapping fluid appropriate for the workpiece material to reduce forming torque and extend tap life. Do not apply thread forming taps to brittle materials such as cast iron or hardened steel, as the forming action requires material ductility. Inspect the shank and square drive seating in the holder before use to prevent slippage or tap breakage.