Hertel 74131533 Screw Machine Drill Bit 5/16 in Cobalt

Product Description

The HERTEL 74131533 is a screw machine length drill bit designed for high-speed, short-reach drilling in metal and hard materials. Built from cobalt steel with a TiAlN coating, it delivers extended tool life in demanding applications where heat and wear are primary concerns. The 135-degree split point reduces walking and requires no center punch before drilling. At 2-13/16 inches overall length with a 1-5/8 inch flute, this stubby format provides rigidity in drill press and CNC setups. Right-hand spiral flutes clear chips efficiently. Machinists, tool-and-die workers, and maintenance mechanics are the primary users.

This bit is suited for production drilling in metal fabrication shops, maintenance and repair operations, and machine shops working with steel, stainless, cast iron, and other ferrous alloys where cobalt tooling is the standard choice. The TiAlN coating performs well in dry and semi-dry cutting conditions common on CNC machining centers and manual drill presses. The straight-cylindrical shank fits standard drill chucks and collet holders without modification. Web thinning improves feed performance and reduces thrust requirements.

Key Features

• Cobalt steel construction for elevated heat resistance and extended tool life in ferrous materials
• TiAlN coating reduces friction and improves wear resistance in dry and semi-dry cutting
• 135-degree split point with web thinning reduces thrust and eliminates the need for center-punching
• Screw machine length (stubby) format provides rigidity and reduces deflection
• Right-hand regular spiral flutes for efficient chip evacuation
• Straight-cylindrical shank fits standard chucks and collets

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for any drill press, CNC machining center, or hand drill with a standard chuck or collet accepting a straight-cylindrical shank in the 0.3000 to 0.3500 inch decimal inch range.

Installation Notes

Installation of this bit should be performed by a qualified machinist or maintenance technician. Ensure the drill chuck or collet is fully disengaged and the machine is powered down before inserting or removing the bit. Seat the shank fully in the chuck or collet to the maximum engagement depth to minimize runout and deflection. Do not exceed the recommended feed and speed parameters for the workpiece material and bit diameter.