Walter-titex 6618159 7/16 in Screw Machine Drill Bit

Product Description

The WALTER-TITEX 6618159 is a screw machine length solid carbide drill bit designed for high-productivity drilling in cast iron and steel. The bit measures 7/16 inch (0.4380 inch decimal) in diameter with a 4-inch overall length and a 140-degree special point angle. Three spiral flutes provide efficient chip evacuation, and the straight-cylindrical shank at 0.4720 inches in diameter seats securely in standard drill chucks and machine tool holders. Part of the DC150-03-A0 series, this bit is built for universal performance in both production and maintenance machining environments where short, rigid tooling is required.

This drill bit is intended for use in screw machines, CNC machining centers, and manual drill presses where stub-length rigidity reduces deflection in tough ferrous materials. Primary workpiece materials include cast iron and steel. The flute-to-diameter ratio of 3xD supports a maximum drilling depth of 1.3140 inches, making it well suited for shallow to medium-depth holes in high-cycle production runs and precision repair work. Licensed machinists and tool-and-die professionals are the primary users of this tooling.

Key Features

• Solid carbide construction for superior hardness and wear resistance in ferrous materials
• 140-degree special point angle reduces thrust and improves centering on entry
• Three spiral flutes with regular helix for balanced chip flow and cutting stability
• Screw machine (stub) length at 4 inches OAL maximizes rigidity and minimizes runout
• Straight-cylindrical shank at 0.4720 inches for direct chuck or collet mounting
• Meets DIN and ISO standards; diameter tolerance m7 for consistent fit

Compatibility

Designed as a direct-fit replacement or standard tooling selection within the WALTER-TITEX DC150-03-A0 series, compatible with drill chucks and collet systems accepting a 0.4720-inch straight-cylindrical shank. Suitable for cast iron and steel workpieces per series specification.

Installation Notes

Installation and use should be performed by qualified machinists familiar with cutting tool safety practices. Secure the shank fully in the chuck or collet to the recommended grip depth before operation, and verify runout with a dial indicator on precision setups. Solid carbide tooling is brittle — avoid side loads, interrupted cuts without proper feed rate adjustment, and dropping the bit on hard surfaces. Follow applicable OSHA machine guarding and PPE requirements when operating drill presses or CNC equipment.