Hertel 66692138 Screw Machine Drill Bit Size 37 Cobalt

Product Description

The HERTEL 66692138 is a screw machine length drill bit designed for high-production drilling in metal fabrication and machining applications. Built from heavy-duty cobalt with a titanium nitride (TiN) coating, it delivers extended tool life in hard and abrasive materials. The 135-degree split point reduces walking and cutting thrust, making it well suited for drilling without a center punch. At 1-13/16 inches overall length with a 13/16-inch flute length, this stub-length geometry provides rigidity and minimizes deflection in short-reach setups. The straight-cylindrical shank fits standard drill chucks without modification.

This bit is used in screw machine shops, CNC drilling operations, sheet metal work, and general metalworking where a stub-length tool is preferred over a jobber-length bit. The Size 37 wire gauge designation corresponds to a decimal diameter of 0.1040 inches, placing it in the 0.1000 to 0.1500 inch size range. It is appropriate for use in drill presses, turret lathes, CNC machining centers, and handheld drill motors when rigidity and chip evacuation matter. The right-hand cutting direction is standard for conventional clockwise-rotating spindles.

Key Features

• Cobalt tool material with TiN coating for improved hardness and wear resistance in ferrous metals
• 135-degree split point with web thinning reduces entry thrust and eliminates pilot hole requirement
• Screw machine (stub) length at 1-13/16 inches OAL provides superior rigidity over jobber-length bits
• Straight-cylindrical shank at 0.1040 inches diameter fits standard drill chucks directly
• Regular spiral flute with parallel web configuration promotes consistent chip evacuation
• Heavy-duty grade construction rated for demanding production drilling environments

Compatibility

Designed as a direct-fit replacement for Size 37 wire gauge screw machine length drill bits used in standard drill chucks accepting a 0.1040-inch straight shank.

Installation Notes

Installation should be performed by a qualified machinist or tool-and-die professional. Secure the shank fully in the drill chuck and verify runout before operation. Always power down and lock out the spindle before changing tooling. Do not exceed the rated speed range for the workpiece material and bit diameter, and use appropriate cutting fluid when drilling hard ferrous alloys to maximize tool life.