Kennametal 4151174 Solid Carbide Drill Bit 5/16 Inch

Product Description

The KENNAMETAL 4151174 is a screw machine length (stub) drill bit designed for high-performance drilling in demanding production environments. Built from solid carbide with a multilayer TiAlN coating at the tip, this bit delivers superior wear resistance and heat tolerance compared to high-speed steel alternatives. At 5/16 inch (0.3125 inch) diameter with a 140-degree split point, it provides fast penetration and accurate self-centering on entry. The overall length is 3.11 inches (79.00 mm), keeping the tool rigid and reducing deflection in short-reach applications. Licensed machinists, tool-and-die techs, and precision drilling operations are the primary users of this series.

This drill bit is suited for stub-length drilling operations where rigidity and positional accuracy are critical. The right-hand spiral flute geometry and tapered web configuration aid chip evacuation in blind and through-hole applications. Coolant-through capability supports high-speed, high-feed machining in ferrous and non-ferrous materials. The straight cylindrical shank with a diameter of 0.3150 inch (8.00 mm) seats directly in standard drill chucks and collets. It is well-matched for CNC machining centers, drill presses, and screw machine setups requiring consistent hole quality at production volumes.

Key Features

• Solid carbide construction for high rigidity and extended tool life in abrasive or hard materials
• Multilayer TiAlN tip coating reduces heat buildup and improves wear resistance at elevated cutting speeds
• 140-degree standard point angle promotes self-centering and reduces thrust force on entry
• Coolant-through design supports high-feed drilling and assists chip evacuation in deep or blind holes
• Tapered web configuration enhances strength at the core while improving cutting geometry
• Stub (screw machine) length minimizes overhang for maximum rigidity and reduced runout
• Conforms to DIN 6537K specification for consistent dimensional standards

Compatibility

Part of the KENNAMETAL Series B051A-CPG stub-length carbide drill line. Designed for use in standard drill chucks and collets accepting a 0.3150-inch straight cylindrical shank. Suitable for CNC machining centers and conventional drilling equipment configured for coolant-through tooling.

Installation Notes

Installation should be performed by qualified machinists or tooling technicians familiar with carbide tooling handling procedures. Ensure the machine spindle and chuck are fully stopped and de-energized before inserting or removing the bit. Carbide tooling is brittle — avoid lateral loading, interrupted cuts beyond the tool's rated capacity, or dropping the bit on hard surfaces. Verify coolant-through lines are clear and delivering adequate flow before running at rated speeds and feeds.