Hertel 66694100 No. 11 Hss Tin Jobber Drill Bit 135 Deg

Product Description

The HERTEL 66694100 is a No. 11 wire-size jobber-length drill bit ground from high speed steel and coated with titanium nitride (TiN) for extended wear resistance. The bit measures 0.1910 inches in diameter with an overall length of 3.5 inches and a flute length of 2.3125 inches. The 135-degree split point reduces walking on entry and lowers the thrust required to start a hole, making it well suited for production drilling in harder materials. Two spiral flutes in a regular helix evacuate chips efficiently during through-hole and blind-hole work.

This jobber drill is used for general holemaking in metal fabrication, maintenance and repair, and light manufacturing environments. The straight-cylindrical shank seats in standard three-jaw drill chucks on hand drills, drill presses, and CNC machining centers alike. The heavy-duty grade designation and NAS specification make it appropriate for drilling mild steel, alloy steel, cast iron, and similar ferrous workpieces where a standard bright-finish bit would wear prematurely. The 0.1910-inch diameter falls within the 0.1500 to 0.2000-inch size range common to wire-gauge drill sets.

Key Features

• 135-degree split point reduces thrust and prevents walking on entry without a center punch
• TiN coating increases surface hardness and extends tool life compared to uncoated HSS
• Web-thinned, tapered web configuration lowers cutting resistance and improves chip flow
• Regular spiral helix with two flutes for efficient chip evacuation in ferrous materials
• Straight-cylindrical shank fits standard drill chucks without adapters
• Heavy-duty grade, NAS specification designation for demanding holemaking applications

Compatibility

Designed as a jobber-series replacement drill bit fitting any standard three-jaw drill chuck accepting a 0.1910-inch straight-cylindrical shank, including hand drills, drill presses, and CNC spindles within the applicable collet or chuck range.

Installation Notes

Installation is performed by machinists, toolroom technicians, and maintenance mechanics. Secure the shank fully in the chuck and verify runout before drilling. Use appropriate cutting fluid or coolant for ferrous materials to preserve coating life, noting that this bit does not support coolant-through operation. Follow applicable shop safety practices including eye protection and secure workpiece fixturing before starting the spindle.