Hertel 84579721 Jobber Drill Bit 17/64 in Hss Tin

Product Description

The HERTEL 84579721 is a 17/64 inch (0.2656 inch) high speed steel jobber drill bit with a titanium nitride (TiN) coating and a 135-degree split point. The TiN coating increases surface hardness and reduces friction, extending tool life in repetitive drilling applications. The web-thinned, split point geometry reduces thrust force at entry and helps the bit start on center without a pilot hole. This is a heavy-duty grade bit suited for use in drill presses, hand drills, and CNC setups. It is installed and used by machinists, maintenance technicians, pipefitters, electricians, and general contractors working in metal fabrication or mechanical assembly.

This jobber-length drill bit is designed for general holemaking in a wide range of materials including mild steel, aluminum, and plastics. The standard jobber-series overall length of 4-1/8 inches and 2-7/8 inch flute length make it compatible with most standard drill chucks. Right-hand spiral flute geometry clears chips efficiently during through-hole and blind-hole operations. Its straight cylindrical shank fits keyed and keyless chucks without adapters.

Key Features

• 17/64 inch diameter with 135-degree split point for self-centering entry
• TiN coating improves wear resistance and reduces heat buildup at the cutting edge
• Web-thinned geometry lowers thrust requirements in hand and machine drilling
• Heavy-duty grade high speed steel construction for extended service life
• Regular spiral, 2-flute design promotes efficient chip evacuation
• NAS specification designation for consistent dimensional standards

Compatibility

Designed as a standard jobber-series replacement drill bit for use in any drill press, hand drill, or machine tool equipped with a chuck accepting a straight cylindrical shank in the 0.2500 to 0.3000 inch diameter range.

Installation Notes

Secure the straight cylindrical shank firmly in a keyed or keyless chuck before use, and verify concentricity to minimize runout. Always wear appropriate eye protection when operating drill bits. For machine applications, follow the tool manufacturer recommended spindle speed and feed rate for the workpiece material. Inspect the cutting edge for wear or chipping before each use and replace when point geometry is compromised.