Kennametal 4151218 Screw Machine Drill Bit 7/16 in

Product Description

The KENNAMETAL 4151218 is a stub-length (screw machine length) solid carbide drill bit designed for high-productivity hole-making in demanding materials. Built to DIN 6537K standards, it features a 140-degree point angle for reduced thrust and accurate self-centering on entry. The multilayer TiAlN coating with a TiN tip extends tool life in abrasive and hard workpiece materials. At 4.016 inches overall length with a 2.165-inch flute length, this bit is sized for rigidity in short-reach applications. Right-hand spiral flutes evacuate chips efficiently. Coolant-through capability supports high-speed operation in production environments. Machinists and tool-and-die professionals are the primary installers of this bit.

This drill bit is intended for precision machining operations in metal fabrication shops, job shops, and production floor environments. The 7/16 inch (0.4375 inch) diameter and 3xD flute-to-diameter ratio make it well suited for stub-depth bores where rigidity matters more than reach. The straight cylindrical shank at 0.4724 inches diameter seats securely in standard drill chucks and collet holders. A maximum drilling depth of 1.575 inches covers the majority of stub-hole applications in steel, stainless, cast iron, and similar ferrous workpieces.

Key Features

• Solid carbide construction for superior hardness and wear resistance compared to HSS alternatives
• 140-degree point angle reduces entry thrust and improves hole position accuracy
• Multilayer TiAlN coating with TiN tip extends tool life in abrasive and hard materials
• Coolant-through design supports high-speed, high-feed drilling in production settings
• DIN 6537K specification ensures dimensional consistency and interchangeability
• Tapered web configuration adds core strength and reduces walking on entry

Compatibility

Designed as an OEM-style replacement or direct-fit option for stub-length solid carbide drill bit applications in standard drill chucks and collet-style toolholders accepting a 0.4724-inch straight cylindrical shank. Part of the KENNAMETAL B051A-CPG series.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and the machine locked out per applicable safety procedures. Confirm the toolholder bore and runout tolerance are within the bit diameter tolerance of -0.0007 to 0.0000 inches before securing. Coolant-through tooling requires a compatible coolant delivery system to be connected and verified before operation. Do not exceed the maximum drilling depth of 1.575 inches without repositioning or selecting a longer-reach tool.