Irwin 4935639 3/16 Inch Jobber Drill Bit Hss Hex Shank

Product Description

The IRWIN 4935639 is a 3/16 inch high speed steel jobber-length drill bit designed for general-purpose drilling in metal, wood, and plastics. The bit features a 135-degree split point that self-centers on contact, reducing walking and the need for a center punch. A black oxide coating provides mild corrosion resistance and reduces friction during cutting. The hex shank measures 1/4 inch across flats and locks securely into quick-change chuck systems, impact drivers, and standard three-jaw chucks. Overall length is 4.25 inches with a flute length of 2.375 inches, and the maximum drilling depth is 2.375 inches.

This jobber drill bit is suited for light-gauge metal fabrication, electrical rough-in work, HVAC sheet metal drilling, plumbing bracket installation, and general trade use on job sites. The right-hand spiral flute design clears chips efficiently during through-hole drilling. The hex shank makes it compatible with quick-change driver systems commonly used in the field, reducing tool swap time. It is sold individually with a minimum order quantity of 5 units per order.

Key Features

• 135-degree split point self-centers on contact, minimizing bit walking on smooth surfaces
• High speed steel construction handles general-purpose drilling across multiple materials
• Black oxide coating reduces friction and provides mild corrosion resistance
• 1/4 inch hex shank fits quick-change chucks and standard three-jaw chucks
• Right-hand regular spiral flute for efficient chip evacuation
• Jobber length with 4.25 inch overall length suits most standard drilling applications

Compatibility

Designed as a general-purpose jobber drill bit compatible with any 1/4 inch hex-drive quick-change chuck, standard keyless or keyed drill chuck, or hex-accepting impact driver rated for drilling applications.

Installation Notes

A licensed electrician, HVAC technician, or plumber installing this bit should ensure the drill is powered off and the chuck is fully secured before beginning work. Use appropriate cutting fluid or lubricant when drilling hardened metals to extend bit life. Follow applicable worksite safety codes and wear eye protection at all times. Inspect the cutting edges before each use and replace the bit if chipping or dullness is observed.