Kennametal 5990979 Solid Carbide Jobber Drill 31/64 in

Product Description

The KENNAMETAL 5990979 is a solid carbide jobber-length drill bit designed for precision hole-making in aluminum and non-ferrous materials. It measures 31/64 inches (0.4844 inches decimal) in diameter with a 135-degree split-point angle that reduces walking and minimizes thrust load on entry. Overall length is 4.88 inches with a flute length of 3.03 inches, providing a 5xD flute-to-diameter ratio suited to moderate-depth drilling applications. The bright, uncoated carbide finish is well matched to non-ferrous materials where coatings can cause edge buildup. Coolant-through capability supports chip evacuation and thermal control at higher feed and speed rates. Licensed machinists, tool-and-die shops, and CNC operators working with aluminum, brass, copper, or similar materials are the primary users of this drill.

This drill bit is sized for production and maintenance machining environments where consistent hole tolerance and surface finish matter. The 3-flat shank design with a 14 mm shank diameter seats securely in standard drill chucks and collet holders, reducing slippage under torque. A maximum drilling depth of 60 mm (2.36 inches) makes it appropriate for through-holes and moderate blind-hole work in plate, extrusion, and cast non-ferrous stock. The two-flute spiral geometry clears chips efficiently, which is critical when drilling gummy materials like aluminum alloy. This bit ships individually and is stocked as a single-unit purchase.

Key Features

• Solid carbide construction provides rigidity and wear resistance beyond high-speed steel in non-ferrous applications
• 135-degree point angle reduces entry thrust and minimizes workpiece deformation on soft metals
• Coolant-through design supports internal chip flushing and heat management at elevated feed rates
• 3-flat shank prevents rotation in chuck or collet holder under load
• Bright, uncoated finish avoids built-up edge common with coated tools on aluminum and copper alloys
• Diameter tolerance of 0.0003 to 0.0010 inches supports close-tolerance hole sizing

Compatibility

Designed for use in aluminum and non-ferrous workpiece materials. The 14 mm, 3-flat shank is compatible with standard drill chucks and collet systems that accept that shank diameter. Verify chuck capacity and collet size before installation.

Installation Notes

This drill should be installed by a qualified machinist or CNC operator following standard tool-change procedures for the machine in use. Secure the shank fully in the chuck or collet and confirm runout before commencing a cut. Ensure coolant-through supply lines are connected and flow-tested before engaging the spindle if using internal coolant. Do not exceed the manufacturer-rated maximum drilling depth of 60 mm per pass without retracting to clear chips.