Hertel 4139705 Cobalt Jobber Drill 19/64 in Tialn 135 Deg

Product Description

The HERTEL 4139705 is a cobalt jobber-length drill bit designed for heavy-duty holemaking in ferrous and hard materials. It measures 19/64 inches (0.2969 inches decimal) in diameter with a 4-3/8 inches overall length and a 3-1/16 inches flute length. The 135-degree split point reduces walking on entry and requires less thrust than a standard 118-degree point. A TiAlN coating adds heat resistance, extending tool life in high-speed or dry drilling applications. This bit is suited for machinists, maintenance mechanics, and metalworking tradespeople working in shop or field environments.

This jobber drill fits standard drill chucks and is appropriate for use in drill presses, CNC machines, and hand-held power drills where a straight-cylindrical shank is compatible. The right-hand spiral flute with regular helix promotes chip evacuation during through-hole and blind-hole operations. It is classed as a heavy-duty grade bit, making it a reliable choice for production drilling or repeated use on hard steels, stainless, and similar alloys.

Key Features

• Cobalt construction for improved heat and wear resistance in hard-material drilling
• TiAlN coating extends cutting life in high-speed and dry drilling conditions
• 135-degree split point reduces thrust requirement and minimizes bit walking on entry
• Web-thinned, tapered web configuration improves chip flow and reduces torque
• Right-hand, regular spiral flute promotes consistent chip evacuation
• Straight-cylindrical shank fits standard drill chucks without an adapter

Compatibility

Designed as a jobber-series replacement drill bit for use in any drill press, CNC drilling application, or handheld power drill equipped with a straight-cylindrical shank chuck in the 0.2500 to 0.3000 inches diameter range.

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or trained tradesperson familiar with cutting tool safety. Ensure the drill chuck is fully tightened and the workpiece is securely clamped before beginning any drilling operation. Disconnect power to the machine before changing or inspecting the bit. Follow applicable shop safety standards and manufacturer guidelines for feed rate and speed selection based on workpiece material.