Hertel 66694027 No 3 Hss Tin Jobber Drill Bit 135 Deg

Product Description

The HERTEL 66694027 is a No. 3 wire-size jobber-length drill bit designed for general-purpose holemaking in metal, wood, and composite materials. Manufactured from high-speed steel (HSS) with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction compared to uncoated HSS tooling. The 135-degree split point promotes faster penetration and self-centering on entry, reducing the need for a center punch on most workpieces. With a 3.75-inch overall length and a 0.2130-inch decimal diameter, this bit fits standard drill chucks and is suited for use in hand drills, drill presses, and CNC drilling operations.

This drill bit is intended for trade and industrial applications where wire-gauge sizing is specified. The No. 3 wire size (0.2130 inches) is commonly used in metalworking, fabrication shops, and maintenance operations. A straight-cylindrical shank provides secure chuck engagement across a wide range of tool holders. The two-flute spiral design with regular helix and tapered web configuration efficiently evacuates chips during drilling, making it appropriate for through-hole and blind-hole work in ferrous and non-ferrous stock.

Key Features

• No. 3 wire size, 0.2130-inch decimal diameter for precise gauge-specified drilling
• 135-degree split point with web thinning for fast, self-centering penetration
• TiN coating extends tool life and reduces heat buildup during cutting
• High-speed steel construction rated for heavy-duty grade service
• 3.75-inch overall length with 2.5-inch flute length for jobber-series reach
• Right-hand cutting, two-flute spiral design with straight-cylindrical shank

Compatibility

Designed as an OEM-style jobber-length drill bit compatible with standard straight-shank drill chucks accepting a 0.2130-inch shank diameter, suitable for use in hand drills, drill presses, and CNC drilling equipment.

Installation Notes

Installation and use of this bit should be performed by machinists, tool-and-die professionals, or qualified tradespeople familiar with rotating cutting tools. Ensure the drill chuck is fully tightened and the workpiece is securely clamped before beginning any drilling operation. Power down and de-energize the drill press or CNC machine before inserting or removing the bit. Do not exceed the recommended RPM range for the material being drilled, and use appropriate cutting fluid when drilling ferrous metals to maintain edge life.