Kennametal 4151167 Screw Machine Drill Bit 7.40mm Carbide

Product Description

The KENNAMETAL 4151167 is a screw machine length (stub) drill bit engineered for precision drilling in demanding production environments. Built from solid carbide with a multilayer TiAlN coating at the tip, this bit delivers high cutting performance and extended tool life in ferrous and non-ferrous materials. The 7.40 mm diameter cutting edge features a 140-degree split point for fast, accurate starts with minimal walking. At 3.1102 inches overall length, its compact stub geometry provides increased rigidity compared to jobber-length drills, making it well suited to CNC machining centers and screw machine operations where runout and deflection must be minimized. Licensed machinists and tooling setters typically specify this format for high-cycle, close-tolerance bore work.

This drill bit is intended for use in horizontal and vertical machining centers, CNC turning centers, and automatic screw machines where short-flute, high-rigidity tooling is required. Its coolant-through design allows internal coolant delivery directly to the cutting zone, supporting chip evacuation and heat management in deep-hole and high-feed applications. The straight cylindrical shank seats directly into standard drill chucks and collet holders accepting an 8.00 mm shank. It is built to DIN 6537K specification, making it a recognized standard in precision metalworking environments across automated and manual production lines.

Key Features

• Solid carbide construction for rigidity and wear resistance in high-cycle drilling applications
• Multilayer TiAlN (TiN tip) coating extends tool life and reduces built-up edge in ferrous materials
• 140-degree standard point angle promotes fast penetration and self-centering entry
• Coolant-through design channels fluid directly to the cutting edge for chip evacuation and thermal control
• Stub flute length of 1.6142 inches increases lateral stiffness, reducing deflection in tight-tolerance bores
• Built to DIN 6537K specification for consistent dimensional accuracy and interchangeability
• 3xD flute-to-diameter ratio supports maximum drilling depth of 29.00 mm (1.1417 inches)

Compatibility

Designed as a direct-fit replacement for Series B051A-CPG stub carbide drill bits. Compatible with standard drill chucks and collet systems accepting an 8.00 mm straight cylindrical shank. Suitable for use in CNC machining centers and screw machines capable of supplying through-spindle coolant.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully stopped and the tool changer or turret is in a safe position before inserting or removing the bit. Verify collet or chuck runout does not exceed acceptable tolerances for the intended bore diameter before beginning a production run. Coolant-through toolholders must be used to take full advantage of the internal coolant channels; plugging the coolant port will reduce tool life and chip evacuation effectiveness.