Kennametal 4151650 Screw Machine Drill Bit 2.50mm Carbide

Product Description

The KENNAMETAL 4151650 is a screw machine length (stub) drill bit engineered for precision drilling in metalworking and machining applications. Built from solid carbide and finished with a multilayer TiAlN coating at the tip, it delivers extended tool life and resistance to heat buildup at the cutting zone. The 140-degree split point reduces thrust force and improves centering accuracy without a pilot hole. At 58.00 mm overall length (2.28 inches), this bit is sized for use in CNC machining centers, drill presses, and screw machine setups where rigidity and hole-to-hole repeatability are critical. It is installed and serviced by machinists, toolroom technicians, and CNC operators.

This drill bit is suited for close-tolerance drilling in ferrous metals, cast iron, and similar hard materials where a stub-length geometry minimizes deflection. The right-hand spiral flute configuration handles standard rotational setups. The straight cylindrical shank at 4.00 mm diameter seats directly into collet chucks and drill chucks without adapters. Series B041A-CPG follows DIN 6537K specification, making it a standard-compliant option for shops working to metric tooling standards. Maximum drilling depth is 12.00 mm (0.47 inches).

Key Features

• Solid carbide construction for rigidity and wear resistance in hard-material drilling
• Multilayer TiAlN coating at the tip reduces thermal wear and extends cutting life
• 140-degree point angle improves self-centering and reduces walking on entry
• Stub length (screw machine length) minimizes deflection in short-reach applications
• Straight cylindrical shank compatible with standard collet and drill chuck systems
• Conforms to DIN 6537K specification for metric tooling standardization

Compatibility

Designed as a DIN 6537K-compliant stub-length drill bit for use in CNC machining centers, drill presses, and screw machines equipped with collet or drill chuck toolholding rated for a 4.00 mm straight shank.

Installation Notes

Installation is performed by qualified machinists or CNC toolroom technicians. Ensure the machine spindle is fully stopped and the tool changer or chuck is locked before inserting or removing the bit. Seat the straight shank fully into the collet or chuck and confirm runout with a dial indicator before production drilling. Solid carbide tooling is brittle and should not be used in setups with excessive vibration or interrupted cuts unless the application is confirmed suitable.