Kennametal 4149249 Solid Carbide Jobber Drill 7.70mm

Product Description

The KENNAMETAL 4149249 is a solid carbide jobber-length drill bit ground to a 7.70 mm (0.3031 inch) diameter with a 140-degree split point. The multilayer TiAlN coating provides heat and wear resistance during high-speed drilling in ferrous and non-ferrous materials. The straight-cylindrical shank measures 8 mm in diameter, and the overall length is 91.00 mm (3.5827 inches). This is a right-hand, regular spiral flute design built to DIN 6537K specification. It is intended for use by machinists and maintenance professionals working on production or jobsite drilling applications where tool life and hole accuracy are priorities.

This drill is suited for cutting steel, stainless steel, cast iron, aluminum, and other non-ferrous materials. The 5xD flute-to-diameter ratio and coolant-through design support chip evacuation and heat control in deeper holes. It fits standard drill chucks and tool holders accepting an 8 mm straight shank. Typical applications include precision hole drilling in fabrication shops, maintenance repair operations, and production machining environments where consistent tolerance and coating durability are required.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• Multilayer TiAlN coating reduces heat buildup and extends tool life
• 140-degree split point geometry reduces thrust force and walking at drill entry
• Coolant-through design supports chip evacuation and thermal management in deep holes
• DIN 6537K specification ensures dimensional consistency and interchangeability
• Tapered web configuration maintains core strength along the flute length

Compatibility

Compatible with standard drill chucks and tool holders accepting an 8 mm straight-cylindrical shank. Rated for use in steel, stainless steel, cast iron, aluminum, and non-ferrous workpiece materials per manufacturer specification. Drill bit size falls within the 7.00 mm to 8.00 mm range grouping (0.3000 to 0.3500 decimal inch).

Installation Notes

Installation is performed by machinists or qualified maintenance technicians. Secure the shank fully in the tool holder or drill chuck before operation and verify runout is within acceptable limits for the application tolerance. Ensure coolant lines are connected and flowing before drilling when using the through-coolant feature. Do not exceed the maximum recommended drilling depth of 43.00 mm (1.6929 inches) without retracting to clear chips.