Precision Twist Drill 010328 Hss Cobalt Jobber Drill 7/16 in

Product Description

The PRECISION TWIST DRILL 010328 is a heavy-duty HSS cobalt straight-shank jobber drill designed for cutting through hard surfaces where standard high-speed steel bits lose effectiveness. Built to type J jobber specifications, it features a 7/16-inch tip diameter and a total length of 5.5 inches with a 4-inch depth of cut. The cobalt content in the steel matrix increases heat resistance, allowing the bit to maintain a sharp cutting edge under aggressive feed rates and elevated temperatures. This drill is suited for machinists, metal fabricators, pipefitters, and mechanical contractors who need reliable performance in tough materials like stainless steel, cast iron, and hardened alloys.

This jobber drill is used in residential and commercial trade applications where hard or abrasive materials require a more durable cutting tool than standard HSS. Typical scenarios include drilling through structural steel, pipe flanges, heavy-gauge sheet metal, and similar hard ferrous materials encountered in HVAC, plumbing, and mechanical installation work. Sold as a single drill in pack unit-of-measure with a minimum order quantity of one.

Key Features

• HSS cobalt construction for enhanced heat resistance and edge retention in hard materials
• Heavy-duty straight shank compatible with standard three-jaw drill chucks
• Type J jobber geometry for general-purpose drilling at extended reach
• 7/16-inch diameter tip for consistent, precise hole sizing
• 4-inch depth of cut supports through-drilling in thick stock
• Total length of 5.5 inches for reach in confined or deep access points

Compatibility

Designed as a straight-shank jobber drill compatible with standard three-jaw keyed or keyless drill chucks accepting 7/16-inch shank tooling, suitable for use in bench drill presses, hand drills, and magnetic drill units configured for straight-shank bits.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with metal drilling procedures. Secure the workpiece fully before drilling to prevent movement and bit breakage. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend bit life and reduce heat buildup. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.

Technical Specifications

• Tip Diameter: 7/16 inches
• Total Length: 5.5 inches
• Depth of Cut: 4 inches
• Shank Type: Straight
• Drill Type: Type J Jobber
• Material: HSS Cobalt
• Weight: 1.05 pounds
• UPC: 086071103284

Standard Information

• Brand: PRECISION TWIST DRILL
• Manufacturer Part Number: 010328