Hertel 2386886 Screw Machine Drill Bit 25/64 in Hss Tin

Product Description

The HERTEL 2386886 is a screw machine length drill bit designed for high-production drilling in metal fabrication, machining, and mechanical trade applications. Built from heavy-duty high-speed steel with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction in ferrous and non-ferrous materials. The 135-degree split point starts on contact without a center punch, reducing walking on flat or curved surfaces. At 3.25 inches overall length and a 25/64-inch (0.3906 inch) diameter, this bit fits standard drill chucks and is suited for close-clearance work where a jobber-length bit would interfere.

This bit is used in general machining, sheet metal work, and mechanical assembly where shorter flute length and rigid cutting geometry improve hole accuracy. The screw machine length profile reduces deflection in drill press and CNC applications. Right-hand spiral flutes evacuate chips efficiently, making it appropriate for through-hole drilling in steel, aluminum, and similar materials. It is sold individually and is a common stock item for machine shops, maintenance technicians, and trade professionals running repetitive drilling operations.

Key Features

• TiN coating reduces friction and extends cutting life compared to uncoated HSS
• 135-degree split point eliminates need for center-punching and reduces thrust force
• Web-thinned, parallel web configuration improves chip flow and cutting efficiency
• Screw machine (stub) length provides added rigidity and reduced deflection versus jobber-length bits
• Straight-cylindrical shank fits standard 3-jaw drill chucks without modification
• Heavy-duty grade construction rated for demanding production drilling environments

Compatibility

Designed as an OEM-style replacement or direct stock bit for use in standard drill presses, CNC drilling centers, and hand drills accepting a straight-cylindrical shank in the 0.3500 to 0.4000 inch decimal inch size range.

Installation Notes

Installation and bit changes should be performed with the drill press or machine fully powered down and the chuck key removed from the work area. A licensed machinist or qualified mechanical technician should verify proper chuck engagement and runout before production use. Follow applicable shop safety standards and wear appropriate eye protection during all drilling operations. Do not exceed the rated speed range for the workpiece material.