Hertel 66691882 Cobalt Screw Machine Drill Bit Size 12

Product Description

The HERTEL 66691882 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and abrasive materials. Built to heavy-duty grade standards, it features a 135-degree split point that reduces walking and allows the bit to start cutting immediately without a center punch. The titanium nitride (TiN) coating increases surface hardness and reduces friction, extending tool life in demanding applications. At 2.25 inches overall length with a 1.1875-inch flute, this stub-length geometry provides added rigidity for accurate hole placement in tight setups or short-travel drill presses.

This bit is suited for metalworking applications in manufacturing, maintenance, and fabrication environments. Screw machine length bits are a common choice when drilling through steel, stainless, cast iron, and other hard metals where a standard-length bit would deflect or chatter. The straight-cylindrical shank fits standard drill chucks without adapters. A right-hand spiral flute clears chips efficiently and pairs well with conventional drilling equipment. Licensed machinists, tool-and-die technicians, and maintenance mechanics are the typical users.

Key Features

• Cobalt construction rated for heavy-duty drilling in hard metals including stainless steel and cast iron
• 135-degree split point reduces thrust and eliminates center-punch requirement on most metals
• TiN coating improves wear resistance and reduces heat buildup at the cutting edge
• Web-thinned parallel web reduces cutting resistance and improves chip evacuation
• Stub screw machine length adds rigidity and minimizes deflection in short-travel setups
• Straight-cylindrical shank fits standard 3-jaw drill chucks without modification

Compatibility

Designed as a direct-fit replacement or supplemental tooling for any drill press, CNC machining center, or handheld drill accepting a straight-cylindrical shank bit in the 0.1500 to 0.2000 inch decimal inch size range.

Installation Notes

This bit is installed and serviced by machinists and maintenance mechanics working under standard shop safety protocols. Secure the shank fully in the drill chuck and verify runout before cutting. Wear appropriate eye protection and use cutting fluid rated for cobalt tooling when drilling ferrous metals. Never exceed the rated speed range for the workpiece material and bit diameter.