M42 Cobalt Fractional Drill Bit Set – 21 Piece Jobber Set | Super Sonic™

USA-Made M42 Cobalt Drill Bits Built for Stainless Steel, Hard Alloys & Demanding Metalworking Applications – 21pc

1/16″ through 3/8″ by 64ths

Super Sonic™ M42 Cobalt Drill Bits represent the highest performance tier in the Super Sonic lineup. Manufactured from premium M42 cobalt steel and built to NAS 907J aerospace specifications, these drill bits are engineered for demanding drilling applications where heat resistance, wear resistance, and tool life matter most.

Covering sizes from 1/16″ through 3/8″ by 64ths, this 21-piece fractional jobber drill bit set delivers professional-grade performance for machinists, fabricators, maintenance departments, aerospace applications, and serious metalworking professionals.

M42 cobalt provides exceptional heat resistance and durability when drilling stainless steel, hardened steel, tool steel, titanium, Inconel®, and other difficult materials. The precision-ground 135° split point starts fast, reduces walking, and produces accurate holes with less effort, while the premium gold surface treatment helps reduce friction and improve drilling performance.

Full round shanks provide maximum concentricity and reliable performance in both handheld and machine-driven applications. Whether used in CNC machines, drill presses, or portable drills, Super Sonic™ M42 drill bits are built for applications where consistent results and long service life are critical.

Manufactured in the USA and designed for professionals who demand more from their tooling, this set covers the most commonly used fractional sizes through 3/8″, providing an ideal balance of capability, performance, and value.

Series Classification: Type 200

Features

• Made in USA
• 21-piece fractional drill bit set
• Sizes 1/16″ through 3/8″ by 64ths
• Premium M42 cobalt steel construction
• Manufactured to NAS 907J aerospace specifications
• 135° split point design
• Premium gold finish
• Full round shanks for maximum concentricity
• Superior heat resistance and wear resistance
• Long tool life in demanding materials
• Suitable for hand drilling and machine applications

Recommended Materials

• Stainless Steel
• Hardened Steel
• Alloy Steel
• Tool Steel
• Titanium
• Inconel®
• Cast Iron
• Aluminum
• Brass
• Copper
• Plastics

Predator™ M35 vs. Super Sonic™ M42

Predator™ M35 Cobalt Drill Bits remain an outstanding choice for everyday professional drilling, fabrication work, maintenance departments, field service, and general shop applications. They offer excellent performance across a wide range of materials and continue to be one of our most popular drill bit lines.

Super Sonic™ M42 Cobalt Drill Bits are designed for applications where maximum heat resistance, extended tool life, and performance in difficult materials become critical. Manufactured from premium M42 cobalt steel to NAS 907J aerospace specifications, they excel in stainless steel, hardened alloys, titanium, Inconel®, CNC machining, and production environments.

Many professional users keep both on hand—Predator™ M35 for general-purpose cobalt drilling and Super Sonic™ M42 for the toughest materials and most demanding applications.

Questions? Call 800-350-8665