Kennametal 4150300 Stub Drill Bit 7/16 in Solid Carbide

Product Description

The KENNAMETAL 4150300 is a stub-length (screw machine length) twist drill bit engineered for high-performance drilling in demanding industrial and machining applications. Built from solid carbide throughout, this bit delivers the rigidity and wear resistance required when working in hard or abrasive materials. It features a 140-degree point angle for fast, accurate penetration with minimal walking, and a multilayer TiAlN coating applied at the tip to extend cutting life under elevated heat conditions. With an overall length of 4.016 inches and a 7/16-inch cutting diameter, it is designed for use in CNC machining centers, drill presses, and screw machine setups where shorter flute-to-length ratios improve rigidity and hole quality.

This drill bit is suited for production environments where tight tolerances and consistent hole geometry are required. The stub-length format reduces deflection and chatter compared to jobber-length bits, making it a preferred choice for high-volume drilling operations. It carries a DIN 6537K specification designation, aligning with standardized European tooling dimensions and tolerances. A straight cylindrical shank with a 0.4724-inch shank diameter ensures reliable clamping in standard drill chucks or collet holders. The 3xD flute-to-diameter ratio supports chip evacuation in moderate-depth holes without coolant-through capability.

Key Features

• Solid carbide construction for maximum rigidity and extended tool life in hard materials
• 140-degree point angle reduces thrust force and improves self-centering on entry
• TiAlN tip coating provides thermal resistance and wear protection at the cutting edge
• Stub-length format minimizes deflection for improved hole straightness and dimensional accuracy
• Right-hand cut with regular spiral flute geometry supports efficient chip removal
• DIN 6537K specification compliance ensures dimensional consistency with standardized toolholding systems

Compatibility

Designed as an OEM-specification stub-length drill bit in the KENNAMETAL Series B041A-CPG, compatible with standard straight-shank drill chucks and collet systems accepting a 0.4724-inch shank diameter.

Installation Notes

Installation and use should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify the shank is fully seated and the chuck or collet is torqued to the machine manufacturer's specification before beginning a drilling operation. Do not exceed the recommended maximum drilling depth of 1.575 inches for this stub-length geometry.