Hertel 66691395 Screw Machine Drill Bit 11/32 in Cobalt

Product Description

The HERTEL 66691395 is a screw machine length drill bit designed for high-speed, close-tolerance drilling in metal and hard materials. Built from heavy-duty cobalt tool steel with a titanium nitride (TiN) coating, this bit delivers extended tool life and heat resistance in demanding production environments. The 135-degree split point reduces walking on entry and requires no center punch on flat stock. At 3 inches overall length, the shortened flute geometry provides added rigidity compared to jobber-length bits, making it well suited for drill press work, CNC applications, and manual machining operations. Licensed machinists and maintenance mechanics are the typical installers.

This bit is designed for use in screw machine operations, drill presses, and CNC machining centers where short, rigid tooling is preferred. The 11/32 inch diameter and straight-cylindrical shank allow it to seat directly in standard chucks and collets without adapters. The right-hand spiral flute evacuates chips efficiently during through-hole and blind-hole drilling in ferrous metals, stainless steel, and other tough alloys. Its heavy-duty grade and TiN coating make it a practical choice for repetitive production runs where tool longevity matters.

Key Features

• Cobalt tool steel construction for high heat and wear resistance in hard metals
• TiN coating extends cutting life and reduces friction at the cutting edge
• 135-degree split point reduces thrust force and eliminates center-punch requirement
• Web-thinned, parallel web configuration improves chip evacuation and reduces torque
• Screw machine length (3 inches OAL) provides rigidity over standard jobber-length bits
• Right-hand spiral flute with straight-cylindrical shank fits standard drill chucks and collets

Compatibility

Designed as an OEM-style replacement or standard tooling option for use in any drill press, screw machine, or CNC machining center accepting a 0.3438 inch straight-cylindrical shank drill bit.

Installation Notes

Installation is performed by machinists or maintenance mechanics. Ensure the machine spindle is fully powered down and locked out before changing tooling. Seat the shank fully and evenly in the chuck or collet and verify runout before beginning a cut. Use appropriate cutting fluid for the workpiece material to extend tool life and prevent work hardening, particularly in stainless steel and high-alloy materials.