Guhring 9085200042000 Drill Bit 4.20mm Solid Carbide

Product Description

The GUHRING 9085200042000 is a screw machine length solid carbide drill bit designed for high-performance drilling in demanding metalworking applications. Built to DIN specification in Series 8520, it features a 4.20 mm diameter, a 140-degree cone relief point, and a nano-Si multi-layer coating engineered to extend tool life in abrasive and hard materials. The straight-cylindrical shank measures 6.00 mm in diameter, and the overall length is 66.00 mm (approximately 2.60 inches). With coolant-through capability and a regular right-hand spiral flute, this bit is suited for precision drilling at controlled feed rates in production environments. Installation and setup are handled by machinists and CNC tooling technicians.

This drill bit is built for primary use in nickel alloys, titanium alloys, and high-tensile alloys - materials that demand a rigid, thermally stable cutting tool. The 3xD flute-to-diameter ratio and 24.00 mm flute length provide adequate chip evacuation in short-hole drilling cycles. Screw machine length geometry keeps the tool compact and stiff, which reduces deflection and runout when drilling tight-tolerance holes. The m7 diameter tolerance supports consistent hole sizing across production runs. Coolant-through channels allow internal delivery of cutting fluid directly to the cutting edge, reducing heat buildup when machining heat-resistant superalloys.

Key Features

• 4.20 mm cutting diameter with m7 tolerance for precise, repeatable hole sizing
• 140-degree cone relief point geometry optimized for hard and high-tensile alloy entry
• nano-Si multi-layer proprietary coating for extended wear resistance in abrasive materials
• Coolant-through design delivers cutting fluid directly to the cutting zone
• Solid carbide grade K40 construction provides rigidity and heat resistance
• Right-hand regular spiral flute with 3xD ratio supports efficient chip evacuation

Compatibility

Designed for use in CNC machining centers and screw machines where short, rigid tooling is required. Primary workpiece materials include nickel alloys, titanium alloys, and high-tensile alloys per Series 8520 application guidelines. Fits standard straight-shank toolholders accepting a 6.00 mm shank.

Installation Notes

This drill bit is installed and operated by machinists or CNC tooling technicians following standard machine shop practices. Ensure the spindle and toolholder are fully powered down and locked out before loading or removing the bit. Use a precision collet or toolholder rated for the 6.00 mm straight shank to minimize runout. When using coolant-through capability, verify that the machine spindle and toolholder support internal coolant delivery before programming the cycle.