Hertel 66692252 Drill Bit Size 49 Cobalt Tin 135 Deg

Product Description

The HERTEL 66692252 is a screw machine length drill bit designed for high-productivity drilling in metal and hard materials. Built from cobalt steel with a titanium nitride (TiN) coating, this bit delivers extended tool life and heat resistance in demanding production environments. It carries a wire gauge size 49 designation, equating to 0.0730 inches in decimal, and features a 135-degree split point that reduces walking and requires no center punch on most surfaces. The overall length is 1-11/16 inches, making it well suited for short-reach, high-cycle drilling in turret lathes, screw machines, and CNC setups. Right-hand cutting with a regular spiral flute pattern ensures efficient chip evacuation.

This drill bit is used in production machining environments where close-tolerance small-diameter holes are required. Typical applications include screw machine operations, turret lathe work, and CNC drilling of ferrous metals, stainless steel, and other hard alloys where cobalt tooling is the standard choice over high-speed steel. The short flute length of 11/16 inches and straight-cylindrical shank make it easy to chuck in standard drill chucks or collet holders without modification. It is appropriate for both job shop and high-volume production settings.

Key Features

• Cobalt steel construction for superior heat and wear resistance compared to standard HSS bits
• TiN coating extends tool life and reduces friction during cutting
• 135-degree split point minimizes drill walk and reduces feed pressure
• Web-thinned, parallel web configuration improves chip flow and reduces thrust load
• Straight-cylindrical shank fits standard drill chucks and collet holders without adapters
• Heavy-duty grade rated for demanding production drilling cycles

Compatibility

Designed as an OEM-style replacement or standard production tool for screw machine and short-drill applications requiring a wire gauge size 49 (0.0730 inches) diameter straight-shank drill bit with a 135-degree split point.

Installation Notes

Installation is performed by machinists or toolroom technicians setting up screw machines, turret lathes, or CNC drilling equipment. Ensure the machine is powered down and all motion has stopped before changing tooling. Secure the straight-cylindrical shank fully within the chuck or collet to the recommended gripping depth and verify runout before beginning a production run. Cobalt bits should be run at appropriate cutting speeds for the workpiece material to avoid overheating the cutting edge.