Kennametal 4151118 Drill Bit Size 21 Solid Carbide 140 Deg

Product Description

The KENNAMETAL 4151118 is a solid carbide screw machine length (stub) drill bit in wire gauge size 21, with a cutting diameter of 0.1590 inches. It features a 140-degree split-point geometry and a multilayer TiAlN coating applied at the tip for extended tool life in demanding materials. The straight cylindrical shank measures 0.2362 inches in diameter and 1.4173 inches in length. Overall length is 2.5984 inches. The bit is designed for right-hand cutting with a regular spiral flute and a tapered web configuration. This is a precision-ground, through-coolant capable tool intended for use by machinists and tooling professionals in CNC and manual drilling operations.

This drill bit is suited for high-speed production drilling in ferrous metals, stainless steel, cast iron, and similar hard materials where tool wear and heat generation are primary concerns. The stub length format provides added rigidity compared to jobber-length bits, making it appropriate for shallow-hole applications and screw machine setups. Coolant-through capability supports chip evacuation in deep or interrupted cuts. The 3xD flute-to-diameter ratio and DIN 6537K specification make this bit a standard choice for precision machining environments in both job shop and production settings.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• 140-degree point angle reduces thrust force and improves centering on entry
• TiAlN tip coating extends tool life under high-heat cutting conditions
• Through-coolant design supports chip evacuation and thermal management
• Tapered web configuration adds strength at the drill tip
• DIN 6537K specification ensures dimensional consistency

Compatibility

Designed as an OEM-style replacement and standard tooling option for screw machines, CNC machining centers, and manual drill presses requiring a wire gauge size 21 stub-length drill bit with a straight shank.

Installation Notes

Installation and use of this tool should be performed by qualified machinists or tooling technicians. Ensure the spindle and toolholder are powered down and fully stopped before inserting or removing the bit. Verify that the straight shank is fully seated and properly clamped in the collet or chuck to rated torque before operation. Do not exceed the rated maximum drilling depth of 0.6693 inches without retracting for chip clearance.