Kennametal 4149645 Taper Length Drill Bit Letter E 1/4 in

Product Description

The KENNAMETAL 4149645 is a taper length drill bit in the B053A-CPG series, designed for precision drilling in demanding industrial and metalworking applications. Built from solid carbide in material grade KC7325, the bit features a multilayer TiAlN coating that extends tool life and maintains performance under high-heat cutting conditions. The 140-degree point angle provides aggressive penetration with reduced thrust force. With a flute length of 2.64 inches (67 mm) and an overall length of 4.13 inches (105 mm), this bit is suited for taper-length drilling operations requiring reach beyond standard jobber lengths. Coolant-through capability supports high-productivity drilling in ferrous and non-ferrous materials.

This drill bit is used in CNC machining centers, drill presses, and manual or automated production drilling setups where tight tolerances and extended tool life are required. The straight cylindrical shank with a shank diameter of 0.315 inches (8 mm) fits standard collet chucks and drill holders. The 8xD flute-to-diameter ratio and tapered web configuration make this bit well suited for deep-hole operations in production environments. Machinists and toolroom technicians working in aerospace, automotive, and general metalworking will find this configuration a reliable choice for Letter E diameter work.

Key Features

• Solid carbide construction in material grade KC7325 for rigidity and wear resistance in hard materials
• Multilayer TiAlN coating extends tool life and resists heat buildup during high-speed drilling
• 140-degree standard point angle reduces thrust and improves centering on entry
• Coolant-through design delivers cutting fluid directly to the tip for heat control and chip evacuation
• Tapered web configuration supports chip flow in deeper drilling operations
• Conforms to DIN 6537K specification for consistent dimensional standards

Compatibility

Designed as a direct-fit taper length drill bit for use in standard straight-shank collet chucks and drill holders accepting an 0.315-inch (8 mm) shank diameter. Intended for Letter E (0.2500-inch decimal equivalent) drilling applications across compatible CNC and manual drilling platforms.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Secure the straight cylindrical shank fully into the collet or drill chuck and verify runout before beginning the cut. Always power down and lock out the machine spindle before changing tooling. Follow shop safety protocols and machine manufacturer guidelines for spindle speeds and feed rates appropriate to the workpiece material and drilling depth.