Kennametal 4151184 Screw Machine Drill Bit 8.70mm Carbide

Product Description

The KENNAMETAL 4151184 is a screw machine length (stub) drill bit engineered for precise, high-performance drilling in metalworking applications. Built from solid carbide and coated with a multilayer TiAlN finish at the tip, this bit delivers extended tool life in hard and abrasive materials. The 140-degree split point reduces thrust and improves hole entry accuracy. At 3.5039 inches overall length with a 1.8504-inch flute length, the compact stub geometry provides added rigidity compared to jobber-length drills, making it well suited for applications where deflection and runout must be minimized. A licensed machinist or toolroom tech is the typical end user.

This drill bit is designed for use in CNC machining centers, drill presses, and screw machine operations involving ferrous and non-ferrous metals, stainless steels, and cast irons. The coolant-through design channels cutting fluid directly to the cutting edge, supporting higher feed rates and extended tool life in production environments. The straight cylindrical shank at 10.00 mm diameter (0.3937 inches) fits standard ER and other common collet systems. It conforms to DIN 6537K specification.

Key Features

• Solid carbide construction for rigidity and wear resistance in demanding metalworking cuts
• Multilayer TiAlN coating at the tip reduces heat buildup and extends cutting life
• 140-degree point angle for reduced thrust and accurate hole entry
• Coolant-through design supports high-feed production drilling
• Stub length geometry minimizes deflection in tight setups or short-reach applications
• Right-hand cut with regular spiral flutes for efficient chip evacuation

Compatibility

Designed as an OEM-style replacement or production tooling option in the KENNAMETAL B051A-CPG series, conforming to DIN 6537K specification for stub-length carbide drill bits with straight shanks.

Installation Notes

Installation is performed by a qualified machinist or CNC operator. Ensure the spindle and workpiece are fully secured before inserting the bit into the collet or chuck. Verify coolant-through passages are clear and that cutting fluid supply is active before engaging the cut. Do not exceed the recommended maximum drilling depth of 35.00 mm (1.3780 inches) per the 3xD flute-to-diameter ratio design.