Kennametal 4151125 Screw Machine Drill Bit 4.40mm Carbide

Product Description

The KENNAMETAL 4151125 is a screw machine length (stub) drill bit designed for high-performance drilling in demanding production environments. Built from solid carbide and coated with a multilayer TiAlN finish at the tip, this bit delivers heat resistance and extended tool life in ferrous and non-ferrous materials. The 4.40 mm diameter matches a 0.1732 decimal inch equivalent, and the 140-degree point angle promotes self-centering entry and reduced thrust force. With an overall length of 66.00 mm (2.5984 inches) and a straight cylindrical shank, it is suited for use in CNC machining centers, drill presses, and screw machine setups where rigidity and repeatability are required.

This drill bit fits applications in precision manufacturing, job shop, and production drilling environments where short, rigid tooling is preferred. The stub length and 3xD flute-to-diameter ratio make it well-suited for shallow-hole operations in tight-tolerance work. Coolant-through capability supports chip evacuation and thermal management in high-cycle drilling operations. The Series B051A-CPG designation identifies it within the KENNAMETAL solid carbide stub drill product line. It is typically installed and used by machinists, toolroom technicians, and CNC operators working to DIN 6537K specifications.

Key Features

• Solid carbide construction with multilayer TiAlN tip coating for extended tool life and heat resistance
• 140-degree point angle for self-centering entry and reduced thrust force
• Coolant-through design supports chip evacuation in high-cycle production drilling
• Stub length with 3xD flute ratio provides rigidity in shallow-hole applications
• Right-hand cutting, regular spiral flute geometry for consistent chip flow
• Tapered web configuration adds strength at the drill point

Compatibility

Designed as an OEM-style screw machine length drill bit conforming to DIN 6537K specification, suitable for use in standard straight-shank drill chucks and collet holders accepting a 6.00 mm shank diameter.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or toolroom technicians. Secure the straight shank firmly in a compatible chuck or collet before operation, and verify runout before beginning any production run. Enable coolant-through supply where the machine spindle supports it to maximize chip evacuation and tool life. Inspect the cutting edges and coating condition before each use and replace the bit if chipping or excessive wear is observed.