Kennametal 4151156 Screw Machine Drill Bit 6.60mm Carbide

Product Description

The KENNAMETAL 4151156 is a screw machine length (stub) solid carbide drill bit designed for high-performance drilling in demanding production environments. Built to DIN 6537K specification, it features a 6.60 mm diameter with a 140-degree split point and a multilayer TiAlN coating at the tip for extended tool life and heat resistance. The straight cylindrical shank measures 8.00 mm in diameter, and the overall length is 79.00 mm (3.1102 inches). A tapered web configuration and regular spiral flutes promote efficient chip evacuation. This drill is suited for use in CNC machining centers, drill presses, and screw machine applications where stub-length rigidity is required.

The 4151156 is intended for metalworking applications in manufacturing and machining environments. Its 3xD flute-to-diameter ratio and coolant-through capability make it well suited for drilling into steel, cast iron, stainless, and similar ferrous materials in both jobshop and production floor settings. The stub length reduces deflection in short-reach setups, making it a reliable choice for machinists and tool-and-die professionals running tight-tolerance work. Maximum drilling depth is 24.00 mm (0.9449 inches).

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• TiAlN tip coating extends tool life under high-heat cutting conditions
• 140-degree point angle reduces thrust force and improves self-centering
• Coolant-through design supports internal coolant delivery for deep-hole thermal management
• Tapered web and regular spiral flutes promote reliable chip evacuation
• DIN 6537K specification ensures dimensional consistency for toolholder compatibility

Compatibility

Designed as a DIN 6537K stub-length carbide drill for use in standard straight-shank toolholders and collet chucks accepting an 8.00 mm shank diameter, within the B051A-CPG series drill family.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Ensure the machine spindle is fully stopped and the tool circuit is de-energized before changing tooling. Confirm the collet or chuck bore matches the 8.00 mm shank diameter and that runout is within acceptable limits before commencing drilling operations. When using coolant-through capability, verify that the machine spindle and toolholder support internal coolant delivery before engaging the coolant supply.