Hertel 74147547 Cobalt Reduced Shank Drill Bit 11/16 in

Product Description

The HERTEL 74147547 is a reduced shank cobalt drill bit designed for drilling into tough, high tensile strength materials. It features an 11/16 inch (0.6875 inch) cutting diameter with a 1/2 inch straight-cylindrical shank, allowing it to fit standard 1/2 inch chucks while drilling larger-diameter holes. The 118-degree standard point angle provides positive engagement on flat and curved stock. An oxide straw finish helps resist heat buildup during extended drilling operations. At 6 inches overall length with a 3 inch flute length, this bit suits deep-hole applications where clearance and chip evacuation both matter. Right-hand cut with a regular spiral flute pattern. Machinists, toolroom technicians, and maintenance mechanics are the primary users.

This drill bit is suited for production and maintenance drilling in ferrous metals, alloy steels, stainless steel, and other tough high tensile strength workpiece materials where standard high-speed steel bits underperform. The reduced shank design makes it practical for use in standard drill presses, milling machines, and hand-held power drills equipped with a 1/2 inch chuck. Typical applications include structural steel fabrication shops, heavy equipment maintenance facilities, and general metalworking operations where cobalt tooling is specified for hardened or work-hardening materials.

Key Features

• Cobalt tool material handles tough high tensile strength and work-hardening alloys
• Reduced shank: 0.6875 inch cutting diameter on a 1/2 inch straight-cylindrical shank fits standard chucks
• 118-degree standard point angle for reliable starts on flat stock
• Oxide straw finish provides heat and wear resistance during sustained cuts
• 3 inch flute length supports up to 3 inches of drilling depth with effective chip evacuation
• Right-hand cut with regular spiral flute pattern for conventional drill press and hand-drill use

Compatibility

Designed as an OEM-style replacement or direct-use cobalt drill bit for any drill press, milling machine, or power drill equipped with a 1/2 inch chuck capacity; compatible with workpieces of tough high tensile strength materials as specified by the manufacturer.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Secure the workpiece firmly before starting the cut and verify chuck tightness to prevent bit slippage. Power down and lock out the machine before changing bits. Do not exceed the rated drilling depth of 3 inches, and use appropriate cutting fluid or lubrication as required by the workpiece material, even though this bit ships without a coolant-through design.