Hertel 85704542 Jobber Drill Bit 5/16 Inch Tin Hss

Product Description

The HERTEL 85704542 is a jobber-length drill bit designed for general-purpose drilling in metal, wood, and composite materials. It measures 5/16 inch (0.3125 inch decimal) in diameter with a 118-degree standard point angle and a TiN (titanium nitride) coating that extends tool life by reducing friction and wear at the cutting edge. The overall length is 4-1/2 inches with a 3-3/16 inch flute length, and the straight-cylindrical shank accepts standard three-jaw chucks. The two-flute spiral design promotes efficient chip evacuation, and the web-thinned, tapered web reduces entry resistance. This bit is intended for right-hand rotation and fits drill presses, hand drills, and CNC setups used by machinists, pipefitters, electricians, and general trade technicians.

This drill bit is suited for light-to-medium duty applications where a standard jobber-length bit covers typical through-hole and blind-hole work. Common install scenarios include drilling pilot holes for fasteners, conduit knockouts, pipe penetrations, and bracket mounting in sheet metal, mild steel, aluminum, and wood substrates. The general-purpose grade and TiN coating make it a practical shop-stock item for service vans and tool cribs alike. Sold individually as a single bit.

Key Features

• 5/16 inch diameter (0.3125 inch) with a 118-degree standard point angle for self-starting entry
• TiN coating reduces surface friction and extends cutting life compared to uncoated HSS
• Web-thinned tapered web lowers thrust requirements and improves center accuracy
• Two-flute regular spiral design clears chips efficiently in through-hole and blind-hole drilling
• Straight-cylindrical shank compatible with standard three-jaw drill chucks
• Right-hand cut geometry suits all conventional drill presses and handheld power drills

Compatibility

Designed as a general-purpose jobber-length replacement drill bit suitable for use in any standard three-jaw chuck accepting a 5/16 inch straight-cylindrical shank.

Installation Notes

Install this bit into a properly rated drill press or handheld drill with the chuck tightened securely before operation. Always wear appropriate eye protection and secure the workpiece before drilling. Reduce feed pressure as the bit breaks through the far side of the material to prevent grab or bit breakage. For drilling steel, use a cutting fluid or lubricant to maintain edge life and manage heat buildup.