Walter-titex 6618155 Screw Machine Drill Bit 27/64 in

Product Description

The WALTER-TITEX 6618155 is a solid carbide screw machine length drill bit engineered for precision hole-making in cast iron and steel. It features a 27/64 inch (0.4220 inch decimal) cutting diameter with a 140-degree special point angle optimized for aggressive penetration and accurate entry without a center punch. Three spiral flutes with a 3xD flute-by-diameter ratio clear chips efficiently in short-hole drilling applications. The straight-cylindrical shank measures 0.4720 inches in diameter and fits standard drill chucks and collet holders. This bit belongs to the DC150-03-A0 series and is built for production environments where consistent dimensional tolerances are required.

This drill bit is suited for machining operations on cast iron and steel workpieces in both shop and field settings. The screw machine length format — shorter overall length for increased rigidity — makes it appropriate for CNC machining centers, drill presses, and manual lathes where stub-length tooling is preferred. The universal tool performance rating and m7 diameter tolerance make it a reliable choice for through-hole and blind-hole work in ferrous materials. Licensed machinists and tool-and-die professionals are the primary users. It does not support coolant-through delivery.

Key Features

• Solid carbide construction for extended tool life in ferrous materials
• 140-degree special point angle for clean entry and reduced thrust force
• Three spiral flutes with 3xD ratio for efficient chip evacuation in short holes
• Screw machine length (4 inches OAL) provides rigidity and reduced deflection
• Straight-cylindrical shank compatible with standard chucks and collet systems
• Meets DIN and ISO standards with m7 diameter tolerance for consistent fit

Compatibility

Designed as a screw machine length replacement or production drill bit for use in CNC machining centers, drill presses, and manual lathes accepting a 0.4720 inch straight-cylindrical shank. Primary workpiece materials are cast iron and steel per DC150-03-A0 series specifications.

Installation Notes

Install in a properly rated chuck or collet holder that matches the 0.4720 inch shank diameter; confirm runout before beginning a production run. De-energize and lock out the machine before changing tooling per applicable shop safety procedures. This bit does not support coolant-through delivery, so ensure adequate external coolant or cutting fluid is applied when drilling steel at production feed rates. Inspect the cutting edges before each use — carbide tips are brittle and susceptible to chipping if subjected to interrupted cuts or improper feed rates.