Kennametal 2658403 Taper Length Drill Bit 23/64 in

Product Description

The KENNAMETAL 2658403 is a solid carbide taper length drill bit in the B978 series, designed for high-performance drilling in ferrous materials. It features a 132-degree point angle with a web-thinned, standard point type for reduced thrust and cleaner entry. The TiAlN coating provides thermal resistance and extended tool life in demanding cutting conditions. At 4.8031 inches overall length with a 3.1496-inch flute length, this bit is built for reach in production environments. Coolant-through capability supports chip evacuation and heat management at the cutting zone. Right-hand spiral flutes and a straight cylindrical shank complete the design for use in standard drill chucks and collet holders.

This drill bit is suited for machining cast iron and steel in both job shop and production settings. The straight cylindrical shank measures 0.3937 inches in diameter and 1.5748 inches in length, compatible with standard toolholding systems. A maximum drilling depth of 2.677 inches and a tapered web configuration support consistent chip flow through the full depth of cut. It conforms to DIN 6537K specification, making it appropriate for shops that standardize on metric-referenced tooling dimensions alongside inch-sized drill diameters.

Key Features

• Solid carbide construction with TiAlN coating for extended tool life in steel and cast iron
• 132-degree point angle with web-thinned geometry reduces entry thrust and improves hole quality
• Coolant-through design supports chip evacuation and thermal management at depth
• Right-hand cut, regular spiral flutes for efficient chip removal
• Straight cylindrical shank for compatibility with standard chucks and collet systems
• Conforms to DIN 6537K specification

Compatibility

Designed for use in cast iron and steel machining applications. Suitable for standard drill chucks and collet holders accepting a 0.3937-inch straight cylindrical shank.

Installation Notes

Installation and use of this tooling should be performed by qualified machinists or tooling technicians. Ensure the machine spindle and toolholder are fully powered down and locked out before changing tooling. Verify runout and shank seating in the holder before initiating a cut. Activate coolant-through supply before engaging the workpiece to prevent thermal shock to the carbide substrate.