Kennametal 2256252 Screw Machine Drill Bit 9.90mm Carbide

Product Description

The KENNAMETAL 2256252 is a screw machine length drill bit engineered for high-performance drilling in cast iron and steel. Built from solid carbide and coated with TiAlN, it delivers extended tool life and heat resistance in demanding production environments. The 9.90 mm diameter bit features a 140-degree standard point angle and a web-thinned, parallel web configuration that reduces entry force and improves chip evacuation. With a 2-flute regular spiral design and an overall length of 89.00 mm, this bit is sized for rigid, close-tolerance work in CNC machining centers and screw machine operations. It carries the Dynapoint High Performance grade designation and conforms to DIN 6537K.

This drill bit is suited for production drilling in ferrous materials, specifically cast iron and steel. The screw machine length format provides a shorter, stiffer profile compared to jobber-length bits, making it well suited for high-feed-rate applications where runout control and hole quality are critical. A straight cylindrical shank with a 10.00 mm diameter ensures secure chuck engagement. It is commonly used by machinists and tool and die professionals on CNC lathes, machining centers, and dedicated screw machine setups requiring consistent hole tolerances.

Key Features

• Solid carbide construction with TiAlN coating for heat and wear resistance
• 140-degree standard point angle reduces thrust force on entry
• Web-thinned parallel web improves chip flow and reduces torque demand
• Screw machine length profile offers increased rigidity over jobber-length alternatives
• Conforms to DIN 6537K specification for dimensional consistency
• Dynapoint High Performance grade material KC7315 for extended tool life

Compatibility

Designed as a direct-fit tooling option for applications requiring a 9.90 mm hole diameter in cast iron or steel, within the KENNAMETAL Series B966A screw machine length drill bit family.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer guidelines for chuck or collet clamping. Power down and lock out the spindle before changing tooling. Verify shank diameter matches the chuck or collet size before seating the bit. Do not exceed the maximum drilling depth of 35.00 mm in a single pass without adequate chip clearing.