Precision Twist Drill 040312 Cobalt Drill Bit 3/16 in 12pk

Product Description

The PRECISION TWIST DRILL 040312 is a cobalt jobber-length drill bit designed for demanding metal drilling applications in trade and industrial environments. Built from M40CO cobalt high-speed steel, this bit features a 135-degree split point that reduces walking on contact and allows drilling to begin without a center punch on most surfaces. The bronze oxide (BRZ) finish provides added lubricity and corrosion resistance during operation. Sold in a pack of 12, the 040312 is suited for production environments, maintenance shops, and field service kits where bit turnover is frequent.

This bit is used primarily for drilling ferrous metals, stainless steel, cast iron, and other hard materials where standard high-speed steel bits wear prematurely. The cobalt alloy construction retains hardness at elevated cutting temperatures, making it appropriate for use without cutting fluid in light-to-medium duty applications. Electricians, pipefitters, HVAC technicians, and general maintenance trades commonly stock this size for conduit work, panel knockouts, and equipment fabrication tasks.

Key Features

• M40CO cobalt high-speed steel construction for extended tool life in hard metals
• 135-degree split point reduces bit walking and improves hole entry accuracy
• 3/16 inch diameter suits common conduit, fastener, and sheet metal applications
• Bronze oxide finish improves lubricity and surface durability
• Pack of 12 supports production and multi-tech service operations

Compatibility

Designed as a jobber-length cobalt drill bit for use in standard three-jaw drill chucks and compatible with any 3/8 inch or larger keyed or keyless chuck accepting round-shank bits.

Installation Notes

This bit is installed by a qualified tradesperson or machinist using a standard drill press, hand drill, or magnetic drill unit. Secure the workpiece before drilling and confirm the chuck is fully tightened before operation. Use appropriate cutting fluid when drilling stainless steel or thick ferrous stock to extend bit life. Follow applicable shop safety standards and wear eye protection at all times during drilling operations.

Technical Specifications

• Diameter: 3/16 inches
• Point Angle: 135 degrees split point
• Material: M40CO cobalt high-speed steel
• Finish: Bronze oxide
• Package Quantity: 12 per pack
• Package Weight: 0.19 pounds
• Unit of Measure: Pack

Standard Information

• Brand: PRECISION TWIST DRILL
• Manufacturer Part Number: 040312