Sgs 66521 Solid Carbide Jobber Drill Wire 12 135 Deg

Product Description

The SGS 66521 is a solid carbide jobber-length drill bit designed for high-performance drilling in demanding materials. Built to DIN 6537 standards, it features a 135-degree split point with web thinning to reduce thrust and improve centering on entry. The Ti-NAMITE-X coating extends tool life by increasing surface hardness and reducing friction at the cutting edge. At 3.228 inches overall length with a 1.732-inch flute, the 66521 suits precision drilling applications where carbide rigidity and coating durability matter. It is installed and used by machinists, maintenance technicians, and industrial tradespeople working in ferrous and non-ferrous materials.

The SGS 66521 fits applications requiring a wire-size 12 drill, equivalent to 4.80 mm or 0.189 inches in diameter. The straight cylindrical shank (6.00 mm diameter) seats into standard drill chucks and CNC toolholders. The 5xD flute-to-diameter ratio and through-coolant capability make this bit well suited to deep-hole drilling operations on machining centers, CNC mills, and drill presses where chip evacuation and heat management are critical. Typical uses include precision hole making in steel, stainless, cast iron, aluminum, and similar materials.

Key Features

• Micrograin solid carbide construction for rigidity and wear resistance in hard materials
• Ti-NAMITE-X coating improves surface hardness and reduces heat buildup at the cutting edge
• 135-degree split point with web thinning reduces entry thrust and improves drill walk resistance
• Through-coolant capable for effective chip evacuation in deep-hole applications
• Right-hand spiral flute geometry in a 5xD ratio supports chip clearing at depth
• DIN 6537 specification ensures dimensional conformance for toolholder compatibility

Compatibility

Designed as a DIN 6537 Series 142P jobber drill for use in standard drill chucks and CNC toolholders accepting a 6.00 mm straight cylindrical shank. Wire size 12 fitment covers applications requiring a 0.189-inch or 4.80 mm hole diameter.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or technicians familiar with cutting tool setup and safe machine operation. Ensure the spindle is fully stopped and the machine is powered down before inserting or removing the tool from the chuck or toolholder. Verify chuck runout is within acceptable limits before use, as excessive runout accelerates wear on carbide tooling. Apply appropriate cutting fluid or coolant when available, particularly when drilling ferrous materials at depth.