Hertel 2386720 9/64 in Screw Machine Drill Bit Tin Hss

Product Description

The HERTEL 2386720 is a screw machine length drill bit designed for high-cycle drilling in metal fabrication, machining, and maintenance applications. It measures 9/64 inches (0.1406 inches decimal) in diameter with a 1-15/16 inches overall length and a 15/16 inches flute length. The bit is manufactured from heavy-duty high-speed steel (HSS) with a titanium nitride (TiN) coating to extend tool life and reduce heat buildup at the cutting edge. The 135-degree split point with web thinning allows the bit to self-center on contact, reducing the need for a center punch on most materials. Licensed machinists, tool and die technicians, and maintenance mechanics are the primary users.

Screw machine length drill bits are shorter than jobber-length bits, which increases rigidity and reduces deflection during drilling. This makes the 2386720 well suited for drill press work, CNC turret operations, and hand-drilling in tight clearance areas where a longer bit would flex or chatter. The heavy-duty grade designation indicates the bit is built for repeated use on ferrous metals, aluminum, and similar materials common in production and maintenance environments. The straight-cylindrical shank is compatible with standard three-jaw drill chucks across a wide range of machine spindles.

Key Features

• 9/64 inch diameter (0.1406 inches decimal) for precise hole sizing
• 135-degree split point with web thinning for self-centering and reduced thrust
• TiN coating extends cutting edge life and improves chip evacuation
• Heavy-duty HSS construction rated for ferrous and non-ferrous metals
• Screw machine length (1-15/16 inches OAL) increases rigidity and reduces deflection
• Right-hand spiral flute with parallel web configuration for consistent chip flow

Compatibility

Designed as a replacement or production-stock screw machine length drill bit for use in standard three-jaw chucks and collet systems accepting straight-cylindrical shanks in the 0.1000 to 0.1500 inch diameter range.

Installation Notes

A licensed machinist or qualified maintenance technician should secure the shank fully in the chuck before operation to prevent slippage. Ensure the machine spindle is at a full stop before inserting or removing the bit. Use appropriate cutting fluid for the material being drilled to maximize coating life and bit longevity. Inspect the cutting edges for wear or chipping before each use; a damaged split point will affect hole accuracy and increase thrust load on the spindle.