Sgs 66644 Taper Length Drill Bit 21/64 in Solid Carbide

Product Description

The SGS 66644 is a taper length drill bit built from micrograin solid carbide and finished with a TX coating for extended tool life in demanding applications. Measuring 21/64 inches (0.2677 inches decimal) in diameter, it features a 135-degree split point for accurate, self-centering starts without a center punch. The spiral flute geometry with web-thinned construction reduces cutting resistance and improves chip evacuation. At 5.5938 inches overall length with a 2.9921-inch flute, this bit is designed for through-hole and deep-hole work where a standard-length drill falls short. It is sold individually and is appropriate for use by machinists, tool-and-die tradespeople, and precision manufacturing operations.

The SGS 66644 is suited for universal material applications including steel, stainless alloys, cast iron, aluminum, and non-ferrous materials. The TX coating provides thermal resistance during high-speed cutting cycles. The cylindrical shank diameter of 8.00 mm seats directly into standard drill chucks, collets, and milling machine spindles. Coolant-through capability makes it compatible with CNC machining centers and drill presses equipped with through-spindle coolant delivery, supporting consistent chip clearing in deep-hole operations at an 8xD flute-to-diameter ratio.

Key Features

• Micrograin solid carbide construction for rigidity and wear resistance in high-performance drilling
• TX coating applied for heat and abrasion resistance during extended cutting cycles
• 135-degree standard split point provides self-centering entry and reduces thrust requirements
• Web-thinned geometry lowers cutting force and improves chip flow
• Coolant-through design supports through-spindle coolant delivery on CNC platforms
• Cylindrical shank compatible with standard collets and drill chucks; conforms to DIN 6537 specification

Compatibility

Designed as a high-performance OEM-style replacement or production drill bit for use in CNC machining centers, drill presses, and manual machines accepting an 8.00 mm cylindrical shank. No specific model compatibility was provided in the product data.

Installation Notes

Installation and use should be performed by a qualified machinist or tooling technician familiar with cutting tool setup. Ensure spindle and workpiece are fully secured and all guards are in place before operation. Confirm shank diameter compatibility with the chuck or collet before mounting and verify coolant lines are clear if through-spindle coolant is used. Follow shop safety procedures and applicable OSHA machining standards when operating rotating cutting tools.