Kennametal 4151643 Screw Machine Drill Bit 2.10mm Carbide

Product Description

The KENNAMETAL 4151643 is a screw machine length (stub) drill bit engineered for precision drilling in metalworking and machining operations. Built from solid carbide and finished with a TiAlN multilayer coating, it delivers extended tool life and heat resistance in demanding cutting applications. The 140-degree split point reduces thrust and minimizes walking on entry. With an overall length of 58.00 mm (2.28 inches) and a 2.10 mm cutting diameter, this bit is sized for tight-clearance and short-reach drilling setups where rigidity is critical. Installation is handled by machinists and tool-and-die professionals.

This drill bit is suited for stub-reach drilling in ferrous and non-ferrous metals, hardened alloys, and similar workpiece materials where a standard-length bit would introduce deflection or chatter. The short flute length of 13.00 mm (0.51 inches) stiffens the tool and limits runout, making it appropriate for CNC machining centers, drill presses, and screw machine applications requiring repeatable hole quality. It conforms to DIN 6537K specification. Maximum recommended drilling depth is 10.00 mm (0.39 inches).

Key Features

• Solid carbide construction for rigidity and wear resistance in high-speed metalworking
• Multilayer TiAlN coating applied at the tip for thermal protection and extended cutting life
• 140-degree standard point angle reduces entry thrust and centers the bit without a pilot hole
• Tapered web configuration adds core strength and supports chip evacuation in stub-depth holes
• Right-hand, regular spiral flute geometry compatible with conventional CNC and manual drilling setups
• Straight cylindrical shank at 4.00 mm diameter fits standard collets and drill chucks

Compatibility

Designed as an OEM-specification stub-length drill bit in the KENNAMETAL B041A-CPG series, conforming to DIN 6537K, for use in metalworking drilling applications requiring a 2.10 mm cutting diameter.

Installation Notes

This tool is installed and changed by machinists or tool setters following standard machine shop lockout/tagout procedures — always de-energize and lock out the spindle drive before tool changes. Secure the straight shank firmly in a collet or keyless chuck rated for the shank diameter to prevent slippage under cutting load. Do not exceed the maximum drilling depth of 10.00 mm without a peck-drilling cycle to clear chips. Inspect the cutting edges for chipping before each use; carbide tooling is brittle and should not be dropped or stored loosely.