Kennametal 4149621 Taper Length Drill Bit 3/16 in Carbide

Product Description

The KENNAMETAL 4149621 is a solid carbide taper length drill bit in the B053A-CPG series, designed for precision drilling in demanding industrial and machining applications. The bit measures 3/16 inch (0.1875 inch) in diameter with a 3.701-inch overall length and carries a 140-degree standard point angle that reduces walking and entry burr. A multilayer TiAlN coating extends tool life under high heat and abrasive cutting conditions. The spiral flute geometry, rated at an 8xD flute-to-diameter ratio, promotes efficient chip evacuation. This tool is installed and operated by machinists, tool-and-die tradespeople, and precision drilling specialists working in metal fabrication environments.

The 4149621 suits applications requiring taper length reach beyond standard jobber drills while maintaining tight diameter tolerances. The right-hand spiral flute and straight cylindrical shank make it compatible with standard drill chucks and collet systems. Coolant-through capability supports internal coolant delivery for deep-hole drilling operations where heat buildup and chip packing are primary concerns. The 8xD flute-to-diameter ratio and 48 mm maximum drilling depth make this bit appropriate for through-hole and blind-hole work in steel, stainless, and hardened alloys where a high-performance carbide grade is required.

Key Features

• Solid carbide construction in material grade KC7325 for rigidity and wear resistance in ferrous and hardened materials
• Multilayer TiAlN coating reduces thermal wear and extends cutting life at elevated spindle speeds
• 140-degree standard point angle minimizes drill walk and reduces entry burr formation
• Coolant-through design supports internal coolant delivery for deep-hole operations
• 8xD spiral flute configuration promotes consistent chip evacuation and prevents chip packing
• Tight diameter tolerance of -0.0005 to 0.0000 inch ensures accurate hole sizing to DIN 6537K specification

Compatibility

Designed as an OEM-compatible replacement and standard taper length drill for machining centers, CNC drilling stations, and manual drill presses accepting straight cylindrical shanks with a 0.2362-inch shank diameter. Specific system compatibility should be verified against spindle chuck capacity and coolant-through circuit requirements before installation.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the spindle drive before inserting or removing the bit from the chuck or collet. Verify that the machine spindle and coolant circuit pressure are within the tool manufacturer specifications before engaging the coolant-through feature. Confirm shank seating depth and runout with a dial indicator before production drilling to maintain tolerance compliance.