Kennametal 4151185 Screw Machine Drill Bit 11/32 in

Product Description

The KENNAMETAL 4151185 is a screw machine length (stub) drill bit designed for high-performance drilling in demanding machining environments. Built from solid carbide and finished with a multilayer TiAlN coating at the tip, this bit delivers extended tool life and heat resistance during aggressive cutting cycles. It measures 3.504 inches overall length with a 11/32 inch (0.3438 inch) cutting diameter and a 140-degree standard point angle. Coolant-through construction supports flushing chips and controlling heat at the cutting zone. The bit is suited for use with CNC machining centers and screw machines where short-length rigidity is required.

This drill bit is intended for metalworking and precision machining applications where compact tool length reduces deflection and improves hole accuracy. Its stub-length profile makes it a go-to choice for production drilling in close-clearance fixtures or short-stack setups on CNC lathes, mill-turn centers, and dedicated screw machine operations. It is installed and operated by machinists and tooling technicians working with ferrous and non-ferrous materials. The 3xD flute-to-diameter ratio and tapered web configuration support efficient chip evacuation across a range of machinable materials.

Key Features

• Solid carbide construction provides rigidity and wear resistance over high-cycle production runs
• Multilayer TiAlN coating (TiN at tip) reduces heat buildup and extends tool life
• 140-degree point angle for aggressive penetration and reduced thrust force
• Coolant-through design delivers cutting fluid directly to the tip for chip flushing and thermal control
• Straight cylindrical shank (0.3937 inch diameter) for secure, standard collet or chuck mounting
• Conforms to DIN 6537K specification for dimensional consistency

Compatibility

Designed as an OEM-style replacement or direct tooling selection for screw machine and stub-length drill applications in the KENNAMETAL Series B051A-CPG. Fits standard straight-shank collets and chucks accepting a 0.3937 inch shank diameter.

Installation Notes

Installation and tool changes should be performed by qualified machinists with the spindle fully stopped and machine power locked out per applicable shop safety procedures. Verify collet or chuck bore matches the 0.3937 inch shank diameter before clamping. Confirm coolant-through passages are clear and system pressure is set per machine specifications before running. Do not exceed the rated maximum drilling depth of 1.378 inches in a single pass without retracting to clear chips.