Kennametal 4151157 Solid Carbide Drill Bit Letter G

Product Description

The KENNAMETAL 4151157 is a solid carbide screw machine length (stub) drill bit sized to Letter G (0.2610 inches / 0.261 inch decimal), built for high-accuracy drilling in demanding production environments. It runs a 140-degree split-point geometry that reduces walking and lowers thrust force on entry. A multilayer TiAlN coating with a TiN tip finish extends tool life in ferrous and non-ferrous materials. At 3.1102 inches overall length with a 1.3386-inch flute, this stub-length bit delivers rigidity in short-hole drilling applications. It is installed and operated by machinists, tool-and-die tradespeople, and maintenance technicians.

The 4151157 is suited for screw machine operations, CNC machining centers, and general-purpose drill press applications where stub-length rigidity is required. The straight cylindrical shank at 0.3150 inches (8.00 mm) fits standard ER and straight-bore collet chucks. Coolant-through capability makes it effective in through-spindle coolant setups for chip evacuation and heat management in deeper hole sequences. The 3xD flute-to-diameter ratio and tapered web configuration are optimized for high-feed, short-hole cycles.

Key Features

• Solid carbide construction for rigidity and wear resistance in production drilling
• 140-degree point angle reduces thrust and minimizes drill walk on entry
• Multilayer TiAlN coating with TiN tip finish for extended tool life in ferrous materials
• Coolant-through design supports through-spindle coolant delivery for chip evacuation
• Tapered web configuration reduces cutting forces and improves chip flow
• DIN 6537K specification for consistent dimensional standards

Compatibility

Designed as an OEM-series replacement and standard production tool within the KENNAMETAL B051A-CPG series, compatible with straight-bore collet chucks and ER-style toolholders accepting a 0.3150-inch (8.00 mm) straight cylindrical shank.

Installation Notes

Installation is performed by machinists or qualified tool-room technicians. Secure the shank fully within the collet or chuck before operation and verify runout before drilling. Disconnect spindle power and confirm machine is in a safe lockout state before changing or inspecting the bit. Do not exceed the rated maximum drilling depth of 0.9449 inches (24.00 mm) per pass without retracting for chip clearing.