Kennametal 4150158 Screw Machine Drill Bit 1/8 in

Product Description

The KENNAMETAL 4150158 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding industrial and machining applications. Built to Series B041A standards, it features a 1/8 inch (3.18 mm) diameter, a 140-degree split point for precise entry and reduced walking, and a titanium nitride (TiN) tip coating that extends cutting life on abrasive materials. The straight cylindrical shank measures 0.2362 inches in diameter and 1.4173 inches in length, making it compatible with standard drill chucks and collet holders. With a compact overall length of 2.4409 inches (62.00 mm), this bit is built for short-reach, high-precision work typical of screw machine and CNC drilling operations.

This drill bit is intended for use on steel, stainless steel, cast iron, and high-temperature alloys. Its screw machine length profile suits applications where rigidity and minimal overhang are critical, such as automatic screw machines, CNC machining centers, and production drilling fixtures. The 2-flute regular spiral design provides efficient chip evacuation during through-hole and blind-hole drilling. Maximum drilling depth is 0.5512 inches (14.00 mm), making it well suited for shallow-to-medium depth holes in production environments.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• TiN tip coating extends tool life on steel, stainless steel, and cast iron
• 140-degree point angle reduces thrust force and improves hole entry accuracy
• Screw machine length body minimizes deflection in high-speed production drilling
• Straight cylindrical shank conforms to DIN 6535 and DIN 6537 standards
• 2-flute regular spiral geometry promotes consistent chip evacuation

Compatibility

Designed for use in standard drill chucks and collet holders accepting a 0.2362 inch straight cylindrical shank. Primary workpiece materials include steel, stainless steel, cast iron, and high-temperature alloys. Conforms to DIN 6535 and DIN 6537 shank standards.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine powered down and locked out per applicable safety procedures. Ensure the shank is fully seated and clamped to the specified runout tolerance of the toolholder before operation. Do not exceed the recommended drilling depth of 0.5512 inches without retracting to clear chips, as this bit does not support coolant-through delivery. Verify spindle speed and feed rate against the material being drilled before starting a production run.