Hertel 66691650 Cobalt Drill Bit Letter P 0.3230 in

Product Description

The HERTEL 66691650 is a cobalt screw machine length drill bit sized to Letter P (0.3230 inches) with a 135-degree split point and a titanium nitride (TiN) coating. Screw machine length bits are shorter than jobber-length bits, which gives them added rigidity and reduces deflection when drilling in metalworking applications. The split point geometry engages the workpiece immediately without walking, and the TiN coating extends cutting edge life by reducing friction and heat buildup. The web-thinned, parallel-web construction supports chip evacuation through the spiral flute. Right-hand cutting direction. Intended for use by machinists, maintenance technicians, and metalworking trades.

This bit is suited for production drilling and maintenance drilling in steel, stainless steel, cast iron, and other ferrous and non-ferrous metals. The heavy-duty cobalt grade makes it appropriate for harder workpiece materials where high-speed steel tooling wears prematurely. The short screw machine length is well matched to drill press, CNC, and turret lathe setups where rigidity and chatter control are priorities. The straight cylindrical shank fits standard 3-jaw chucks without a reducer.

Key Features

• Cobalt construction rated for heavy-duty drilling in hard and abrasive metals
• TiN coating reduces friction, extends cutting edge life, and improves heat resistance
• 135-degree split point starts without a center punch and reduces thrust force
• Web-thinned parallel web promotes chip flow and lowers cutting resistance
• Screw machine (stub) length provides greater rigidity than jobber-length alternatives
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for any application requiring a Letter P (0.3230 inch) diameter hole in metalworking operations. Fits any machine or hand drill with a chuck capacity that accepts a 0.3230-inch straight shank.

Installation Notes

Secure the shank fully in the chuck before powering the machine to prevent runout and shank damage. Use cutting fluid or coolant appropriate to the workpiece material to manage heat and extend tool life, especially when drilling stainless steel or hardened alloys. Inspect the cutting edge before each use and remove the bit from service if chipping or dullness is observed. Follow machine manufacturer guidelines and applicable shop safety standards when operating drilling equipment.