Hertel 42133 Cobalt Jobber Drill 11/64 in 135 Deg Split Point

Product Description

The HERTEL 42133 is a cobalt jobber-length drill bit designed for drilling into stainless steel, hardened materials, and other tough alloys that defeat standard high-speed steel tooling. Built to M35 grade cobalt material spec, it carries a 135-degree split-point geometry that reduces walking on entry and lowers the thrust required to start the cut. The 11/64-inch diameter (0.1719 inch decimal) straight-cylindrical shank fits standard drill chucks without adapters. With an overall length of 3.25 inches and a 2.125-inch regular spiral flute, it delivers chip clearance appropriate for production or maintenance drilling in metalworking environments. The oxide finish provides baseline surface protection. No coolant-through feature is present, so external lubrication is recommended when drilling ferrous alloys.

This drill bit is suited for metal fabrication shops, maintenance and repair operations, and field service work where small-diameter holes must be put through stainless steel fastener clearances, bracket stock, or hardened wear components. The heavy-duty M35 cobalt grade handles intermittent cutting conditions and elevated heat better than M2 high-speed steel, making it a practical choice when drilling materials that generate significant heat at the cutting edge. The 5xD flute-to-diameter ratio places it in the standard jobber-length category, compatible with benchtop drill presses, magnetic drills, and hand-held electric drills.

Key Features

• M35 cobalt construction resists heat and wear when cutting stainless steel and hardened materials
• 135-degree split-point tip reduces drill walk and lowers entry thrust
• 11/64 inch (0.1719 inch) diameter with straight-cylindrical shank fits standard drill chucks
• Regular right-hand spiral flute with 5xD ratio provides efficient chip evacuation
• 3.25-inch overall length suits benchtop, magnetic, and handheld drilling applications
• Oxide finish provides surface protection without altering critical diameter tolerances

Compatibility

Designed as an OEM-style replacement or direct-use jobber drill for standard 11/64-inch diameter drilling applications in stainless steel and hardened materials, compatible with any drill press or hand drill accepting a straight-cylindrical shank in this diameter range.

Installation Notes

Installation of this drill bit requires a drill chuck rated for the straight-cylindrical shank diameter and appropriate for the rotational speed required by the workpiece material. Secure the shank fully in the chuck before operation and confirm runout is within acceptable tolerance for the application. Apply cutting fluid or lubricant at the drill tip when working stainless steel or hardened stock to extend tool life and reduce heat buildup. Operate at the feed rate and RPM recommended by the tooling manufacturer for the specific workpiece material and thickness.