Cleveland C15125 Screw Machine Drill Bit 7/64 Cobalt

Product Description

The CLEVELAND C15125 is a screw machine length drill bit built for high-performance drilling in tough materials. It carries a No. 35 wire size designation, equivalent to 7/64 inch (0.1100 inches decimal), and uses M42 cobalt high-speed steel to handle alloy steels, stainless, and work-hardening materials that standard HSS bits cannot manage. The 135-degree split point reduces thrust, self-centers on contact, and eliminates the need for a center punch in most applications. With an overall length of 1-7/8 inches, this screw machine length geometry is designed for tight-clearance drilling on drill presses, CNC machines, and screw machine setups where stub rigidity matters.

The C15125 is suited for production and precision drilling in metalworking environments — machine shops, manufacturing lines, and maintenance operations where hole quality and bit longevity are priorities. Primary workpiece materials listed by the manufacturer include alloy steel and aluminum. The parabolic flute design improves chip evacuation in deeper holes, reducing heat buildup and extending tool life. The straight-cylindrical shank seats cleanly in standard chucks without set-screw marks or runout issues common to reduced-shank designs.

Key Features

• M42 cobalt steel construction for drilling alloy steel, stainless, and other work-hardening materials
• 135-degree split point for reduced thrust and self-centering entry without a center punch
• Parabolic flute geometry promotes efficient chip evacuation and reduces heat buildup
• Web-thinned, parallel web configuration minimizes walking and improves feed consistency
• Screw machine length (1-7/8 inches OAL) delivers added rigidity in tight-clearance setups
• Meets ASME B94.11M standards with ANSI specification designation

Compatibility

Designed as an OEM-compatible screw machine length drill bit for use in standard straight-shank drill chucks on CNC machines, drill presses, and screw machines where a No. 35 wire size or 7/64 inch diameter is specified.

Installation Notes

Installation is performed by machinists and tooling technicians. Secure the straight-cylindrical shank firmly in a keyed or keyless chuck before operation and verify runout with a dial indicator on precision applications. Confirm the machine spindle is fully stopped before changing bits. Follow applicable OSHA machine guarding and PPE requirements when operating drilling equipment.