Guhring 9055250103000 Extra Length Drill Bit 10.3mm

Product Description

The GUHRING 9055250103000 is a solid carbide extra length drill bit engineered for high-performance drilling in demanding metal cutting applications. It measures 10.3 mm in diameter with a 204 mm overall length and a 156 mm flute length, placing it in the 12xD flute-to-diameter ratio category. The 140-degree split point with web thinning reduces entry thrust and helps the bit self-center without a pilot hole. A FIREX coating improves surface hardness and thermal resistance, extending tool life in abrasive and high-heat cutting environments. The straight-cylindrical shank with an h7 diameter tolerance of 12 mm fits standard collet chucks and drill holders used in CNC machining centers and manual drilling setups.

This drill bit is built for use in metalworking operations involving alloy steel, carbon steel, and cast iron. The extra length design suits deep-hole applications where a standard-length bit cannot reach, such as cross-drilling in structural components, tooling fixtures, or fabricated assemblies. Coolant-through capability allows cutting fluid to be delivered directly to the cutting edge, making this bit well-suited for high-speed CNC operations where heat management is critical. Machinists and toolroom technicians are the primary users of this style of bit.

Key Features

• Solid carbide construction for rigidity and wear resistance in steel and cast iron
• FIREX coating for increased surface hardness and elevated temperature resistance
• 140-degree double margin point with web thinning for reduced entry force and improved self-centering
• Coolant-through design for direct cutting fluid delivery at the tip during CNC operations
• 12xD flute-to-diameter ratio supports deep-hole drilling beyond standard bit reach
• h7 shank diameter tolerance for precise fit in collet chucks and toolholders

Compatibility

Rated for use in alloy steel, carbon steel, and cast iron. The 12 mm straight-cylindrical shank with h7 tolerance is compatible with standard ER collet chucks and hydraulic toolholders that accept 12 mm shank tooling.

Installation Notes

Installation and use of this bit should be performed by a qualified machinist familiar with CNC or manual drilling equipment. Confirm spindle speed and feed rate are appropriate for the workpiece material and bit diameter before starting the cut. Secure the shank fully in the toolholder to the recommended grip depth and verify runout before drilling. When using the coolant-through feature, ensure the machine coolant system is pressurized and flowing before the spindle engages the workpiece.