Hertel 2386845 Screw Machine Drill Bit 21/64 in Tin

Product Description

The HERTEL 2386845 is a screw machine length drill bit designed for high-production drilling in metal fabrication, maintenance, and general machining applications. It measures 21/64 inch (0.3281 inch decimal) in diameter with a 2-15/16 inch overall length and a 1-11/16 inch flute length. The bit is manufactured from high-speed steel with a titanium nitride (TiN) coating, which reduces friction and extends tool life compared to uncoated HSS. The 135-degree split point geometry allows faster penetration and reduces the tendency to walk on smooth surfaces, eliminating the need for a center punch in most applications.

Screw machine length drill bits are shorter and more rigid than jobber-length bits, making them well suited for CNC machining centers, drill presses, and turret lathes where reduced overhang and improved rigidity are priorities. This bit is also used in production environments where hole location accuracy and consistent finish are required. The straight-cylindrical shank fits standard drill chucks and collet holders without modification. It is appropriate for drilling ferrous and non-ferrous metals, plastics, and similar materials encountered in metalworking shops, maintenance facilities, and light manufacturing.

Key Features

• TiN coating reduces friction and increases surface hardness for extended tool life in production drilling
• 135-degree split point with web thinning reduces thrust force and prevents bit walk on entry
• Screw machine length body provides greater rigidity than jobber-length bits, improving hole accuracy
• Right-hand spiral flute efficiently evacuates chips from the cutting zone
• Straight-cylindrical shank fits standard drill chucks and collet systems without adapters
• Heavy-duty grade high-speed steel construction suitable for demanding production cycles

Compatibility

Designed as a replacement or production-stock screw machine length drill bit for use in any drill chuck or collet holder accepting a straight-cylindrical shank in the 21/64 inch diameter range.

Installation Notes

Installation of this bit should be performed by a machinist or qualified trade professional. Ensure the drill press, lathe, or machining center is fully de-energized and at a complete stop before changing tooling. Secure the shank fully and evenly in the chuck or collet to the recommended engagement depth to prevent runout. Use appropriate cutting fluid or coolant for the workpiece material, noting that this bit does not have through-coolant capability.