Kennametal 4151168 Screw Machine Drill Bit 7.50mm Carbide

Product Description

The KENNAMETAL 4151168 is a screw machine length (stub length) drill bit engineered for high-performance drilling in demanding production environments. Built from solid carbide with a multilayer TiAlN coating at the tip, it delivers extended tool life and thermal resistance in ferrous and non-ferrous materials. The 7.50 mm diameter bit features a 140-degree point angle for reduced thrust and accurate self-centering on entry. At 79.00 mm overall length with a 41.00 mm flute length, the compact stub-length geometry provides maximum rigidity to minimize deflection and breakage in short-depth drilling applications. Coolant-through capability supports chip evacuation and thermal management in high-cycle machining setups.

This drill bit is suited for CNC machining centers, turret lathes, and screw machines operating in production shops, tool rooms, and job shops. The straight cylindrical shank at 8.00 mm diameter seats securely in standard drill chucks and collet systems. The regular spiral flute and tapered web configuration promote consistent chip flow. Maximum drilling depth is 29.00 mm, making this bit appropriate for stub-depth through-holes and blind holes in workpieces where rigidity and precision tolerances are critical. It is typically installed and used by machinists and CNC operators.

Key Features

• Solid carbide construction for rigidity and wear resistance in production drilling
• Multilayer TiAlN tip coating increases heat resistance and extends tool life
• 140-degree point angle reduces entry thrust and improves hole location accuracy
• Coolant-through design supports chip evacuation and thermal control at the cutting edge
• Stub length geometry minimizes overhang and deflection for tighter tolerances
• Conforms to DIN 6537K specification for dimensional consistency

Compatibility

Designed as an OEM-style replacement and standard production drill in the KENNAMETAL B051A-CPG series, compatible with any machine spindle or toolholder accepting an 8.00 mm straight cylindrical shank.

Installation Notes

Installation and use should be performed by qualified machinists or CNC operators. Ensure the machine spindle is fully stopped and locked out before loading or changing tooling. Seat the shank fully into the collet or chuck and confirm runout is within tolerance before engaging the cut. Do not exceed the maximum recommended drilling depth of 29.00 mm without retracting to clear chips, particularly in blind-hole applications.