Hertel 42235 Cobalt Screw Machine Drill Bit 35/64 in

Product Description

The HERTEL 42235 is a cobalt screw machine length drill bit designed for demanding metal drilling applications in production and maintenance environments. Built from M35 cobalt high-speed steel with an oxide straw finish, this bit handles elevated cutting temperatures without sacrificing hardness or edge retention. The 135-degree split point reduces walking on contact and lowers thrust requirements, making it well-suited for drilling harder materials where standard HSS bits wear prematurely. At 4.0 inches overall length with a 2.5-inch spiral flute, this is a stub-length geometry that maximizes rigidity and minimizes deflection in short-reach setups. Licensed machinists, tool and die technicians, and industrial maintenance mechanics are the primary users.

This bit is engineered for hardened materials, heat-treatable alloyed steels, stainless steel, and titanium alloy. The 35/64 inch (0.5469 inch) diameter and screw machine length profile make it a practical choice for CNC drilling, drill press work, and hand-held power drilling where rigidity matters. The regular spiral flute geometry provides consistent chip evacuation in the materials listed. It is sold individually and ships as a single unit per package.

Key Features

• M35 cobalt steel construction handles hardened materials and heat-treatable alloys
• 135-degree split point reduces thrust and prevents bit walking on hard surfaces
• Oxide straw finish improves lubricity and heat resistance during cutting
• Screw machine (stub) length geometry maximizes rigidity and reduces deflection
• Regular spiral flute with 3xD flute-to-diameter ratio for efficient chip removal
• No coolant-through design suitable for standard dry or flood-coolant setups

Compatibility

Designed as an OEM-style replacement or direct-use cobalt drill bit for industrial drilling applications involving hardened materials, heat-treatable alloyed steels, stainless steel, and titanium alloy where a 35/64 inch diameter stub-length bit is specified.

Installation Notes

Installation is performed by machinists or industrial maintenance technicians using a drill press, CNC machining center, or hand-held drill with an appropriate chuck size for 35/64 inch shanks. Ensure the workpiece is securely clamped before drilling to prevent rotation and bit breakage. When drilling stainless steel or titanium, use a cutting fluid rated for those materials to extend bit life. Inspect the split point before each use and replace the bit if the cutting edges show signs of chipping or heat discoloration beyond the normal straw finish.