Kennametal 4150321 Carbide Drill Bit 12.90mm 140deg

Product Description

The KENNAMETAL 4150321 is a stub-length (screw machine length) drill bit engineered for precision drilling in demanding metalworking applications. Built from solid carbide with a multilayer TiAlN coating at the tip, this bit delivers extended tool life and heat resistance in high-speed drilling operations. The 140-degree split point promotes accurate positioning and reduces thrust requirements at entry. With an overall length of 4.2126 inches (107 mm) and a 12.90 mm cutting diameter, it is sized for production environments where rigidity and hole quality are critical. Machinists, tool-and-die shops, and CNC operators are the primary users of this series.

This drill bit is intended for stub-length drilling applications where shorter flute length provides added rigidity and reduced deflection. The B041A-CPG series is designed for use in CNC machining centers and screw machine setups where consistent hole diameter tolerances are required. With a flute-to-diameter ratio of 3xD and a maximum drilling depth of 1.6929 inches (43 mm), it is suited for moderate-depth holes in ferrous and non-ferrous materials. Right-hand cutting direction is standard. The straight cylindrical shank fits conventional collet chucks and drill holders.

Key Features

• Solid carbide construction for rigidity and wear resistance in production drilling
• TiAlN multilayer coating at the tip reduces heat buildup and extends cutting life
• 140-degree point angle improves self-centering and lowers entry thrust
• Stub length (screw machine length) design minimizes deflection in short-hole applications
• Tapered web configuration adds core strength behind the cutting edge
• DIN 6537K specification compliance ensures dimensional consistency

Compatibility

Designed as an OEM-style replacement or direct-fit drill bit for CNC machining centers and screw machine setups accepting a 14.00 mm straight cylindrical shank, within the B041A-CPG series covering the 11.00 mm to 13.50 mm diameter range.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify collet or chuck bore matches the 14.00 mm shank diameter before seating. Follow the machine tool manufacturer's recommended speeds and feeds for the workpiece material; do not exceed rated RPM for this diameter class.