Kennametal 4150185 Screw Machine Drill Bit 9/64 Inch Carbide

Product Description

The KENNAMETAL 4150185 is a stub-length (screw machine length) solid carbide drill bit designed for high-precision, high-throughput drilling in metalworking and machining applications. Built to DIN 6537K specifications, it features a 140-degree standard point angle and a multilayer TiAlN coating at the tip that extends tool life in abrasive and high-temperature cutting conditions. The 9/64-inch (0.1406 inch) diameter is held to a tight tolerance of -0.0005 to 0.0000 inches, making it well-suited for precision bore work. Machinists and toolroom technicians working in CNC, manual lathe, or drill press setups are the primary installers of this bit.

This drill bit is intended for stub-length drilling applications where rigidity and minimal deflection are critical. Its compact overall length of 2.4409 inches and short flute length of 0.7874 inches reduce runout and improve accuracy in close-quarter or fixture-mounted drilling. Maximum drilling depth is 0.5512 inches, making it appropriate for through-hole and shallow blind-hole operations in steel, cast iron, aluminum, and similar materials. The straight cylindrical shank (6.00 mm diameter) fits standard drill chucks and collet holders across common machine tool platforms.

Key Features

• Solid carbide construction for rigidity and wear resistance in metalworking applications
• TiAlN tip coating extends tool life in abrasive and elevated-temperature cutting conditions
• 140-degree standard point angle reduces thrust force and improves hole entry accuracy
• Tight diameter tolerance of -0.0005 to 0.0000 inches meets DIN 6537K specification
• Stub (screw machine) length design minimizes deflection and improves concentricity
• Tapered web configuration and regular spiral flute support efficient chip evacuation

Compatibility

Designed as an OEM-specification stub-length drill bit in KENNAMETAL Series B041A-CPG, suitable for use in standard drill chucks and collet holders accepting a straight cylindrical shank of 0.2362 inches (6.00 mm) diameter.

Installation Notes

Installation is performed by machinists or toolroom technicians on CNC machining centers, drill presses, or manual lathes. Ensure the machine spindle and workpiece are secured before inserting the bit into the chuck or collet. Verify runout with a dial indicator before beginning a precision drilling operation. Do not exceed the maximum drilling depth of 0.5512 inches without retracting to clear chips.