Kennametal 4150272 Screw Machine Drill Bit 9.40mm Carbide

Product Description

The KENNAMETAL 4150272 is a screw machine length (stub) drill bit engineered for high-performance drilling in metalworking and machining applications. Built from solid carbide with a multilayer TiAlN coating, this bit delivers superior hardness and heat resistance compared to high-speed steel alternatives. It features a 140-degree split point for precise hole entry, reduced walking, and lower thrust requirements. The right-hand spiral flute geometry promotes efficient chip evacuation. At 3.5039 inches overall length with a 9.40 mm cutting diameter, this bit is suited for CNC machining centers, drill presses, and screw machine setups where rigidity and accuracy are critical.

This drill bit is designed for stub-length drilling operations where reduced overhang improves rigidity and dimensional accuracy. Typical applications include through-hole and blind-hole drilling in steel, cast iron, stainless steel, and similar ferrous materials encountered in production machining environments. The straight cylindrical shank accommodates standard drill chucks and collet systems. It conforms to DIN 6537K specifications, making it a direct fit for shops working to metric DIN tooling standards. Machinists and CNC operators in job shops, aerospace, and general manufacturing will find this bit appropriate for medium-to-hard material drilling at production volumes.

Key Features

• Solid carbide construction for superior rigidity and wear resistance versus HSS alternatives
• Multilayer TiAlN coating provides extended tool life in ferrous and high-temperature alloy applications
• 140-degree point angle reduces thrust and minimizes drill walking on entry
• Stub (screw machine) length design minimizes overhang for improved hole location accuracy
• Regular spiral flute with tapered web configuration for efficient chip evacuation
• Conforms to DIN 6537K specification for metric tooling standardization

Compatibility

Designed as a DIN 6537K-compliant stub drill bit in the KENNAMETAL Series B041A-CPG, suitable for use in standard drill chucks and collet holders accepting a 10.00 mm straight cylindrical shank. Fits drilling operations within the 8.00 to 9.50 mm drill bit size range category.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine powered down and locked out per applicable safety procedures. Ensure the shank seating surface and chuck or collet bore are clean and free of chips before securing the bit. Do not exceed the maximum drilling depth of 35.00 mm (1.3780 inches) to avoid flute packing and tool breakage. Inspect the cutting edge and coating condition before each use, as solid carbide is brittle and susceptible to chipping from interrupted cuts or improper feeds and speeds.