Precision Drilling for Stainless Steel, Auto/MRO & HVAC Use

The XRTOOLS 15-Piece M35 Cobalt Drill Bit Set is engineered to meet the rigorous demands of auto repair, MRO, and HVAC installations, offering exceptional performance on stainless steel, cast iron, and alloy metals. This set provides precise drilling with a 135° split-point tip and a cobalt alloy substrate (M35, ~5% cobalt) for heat resistance and extended tool life. Fully-ground twist flutes ensure smooth chip evacuation for cleaner, rounder holes.

Why Choose This M35 Cobalt Drill Set?

Key Features & Benefits
M35 Cobalt Alloy: With approximately 5% cobalt, the M35 steel offers excellent heat resistance, ideal for drilling through stainless steel, hardened materials, and cast iron without losing edge sharpness.

135° Split Point: The self-centering point reduces walking, eliminates the need for a pilot hole, and ensures accurate and consistent hole placement.

Fully Ground Flutes: Provides smooth chip flow, reducing friction and wear, resulting in cleaner holes and a longer-lasting drill bit.

Round Shank, Jobber Length: The standard round shank design allows compatibility with 3-jaw chucks on cordless drills, corded drills, and drill presses, providing greater versatility for a range of applications.

Durable Metal Index Case: The durable metal index case with labeled wells makes storage, organization, and size identification fast and easy. Perfect for any workshop or jobsite.

Applications for M35 Cobalt Drill Bit Set

Precision Drilling in Automotive, MRO & HVAC Installations
Automotive/MRO Use: Perfect for drilling holes in exhaust manifolds, brackets, mounting points, sensors, fastener preparation, and broken bolt extraction. The M35 cobalt drill bits withstand the high-stress environment of automotive repair and maintenance.

HVAC Installations: For installing brackets, panels, and ducts in both residential and commercial HVAC systems, the M35 cobalt bits provide long-lasting performance and precise hole placement in sheet metal and ductwork.

Stainless Steel Drilling: Ideal for stainless steel, alloy steel, and mild steel, the M35 cobalt provides the necessary hardness and heat resistance for metal fabrication and machining jobs.

General Drilling Tasks: Perfect for use in metalworking shops, woodworking, plastic drilling, and general fabrication, this set covers a wide range of tasks with precision and durability.

Product Specifications

How to Use the M35 Cobalt Drill Set

Drilling Tips
Stainless Steel: For stainless steel, use low RPM, maintain steady feed, and apply cutting oil to reduce heat buildup. Peck drilling is recommended for deep holes to avoid chip clogging.

Automotive Use: Use moderate RPM and a steady feed when drilling through exhaust systems or automotive panels. Cutting oil will extend the tool's life in hard materials.

HVAC & Metalwork: Keep a steady feed when drilling through sheet metal, ducts, or brackets. Ensure proper hole alignment to maintain system integrity.

Frequently Asked Questions (FAQ)

Q1: Is this set suitable for drilling through hardened steel or cast iron?
A: Yes, the M35 cobalt drill bits are specifically designed for tough materials like hardened steel, cast iron, and stainless steel, offering excellent heat resistance and durability.

Q2: Can I use these drill bits in an impact driver?
A: These drill bits are round-shank and are designed for use with standard 3-jaw chucks on drills. For impact drivers, we recommend a hex-shank version for added durability.

Q3: How do I care for the drill bits?
A: To prolong the life of your M35 cobalt drill bits, use appropriate coolant or cutting oil when drilling through metal. Resharpen them regularly to maintain the 135° split-point and overall performance.

Q4: Can I get a version with metric sizes?
A: Yes, we offer a metric version of this set, which includes sizes ranging from 1.0mm to 6.5mm.