What It Is

This M35 cobalt aircraft extension drill bit is designed for drilling in deep, recessed, or hard-to-reach areas where standard length drill bits cannot reach. It is well suited for maintenance, fabrication, aerospace, and field service applications requiring extended reach, durability, and precision.

Material & Construction

Manufactured from M35 cobalt high-speed steel, this drill bit offers increased hardness, wear resistance, and heat resistance compared to standard HSS. The gold oxide surface treatment helps the tool perform under higher temperatures while maintaining durability in demanding drilling applications.

135° Split Point

The 135° split point tip starts on contact and helps reduce walking, especially when drilling in tight or awkward positions. This geometry also requires less thrust, making it easier to control when working at extended lengths.

Aircraft Extension Design

Aircraft extension drill bits are significantly longer than standard jobber length bits, allowing access to deep holes and confined spaces that would otherwise be unreachable. This extended length makes them ideal for applications where clearance is limited or additional reach is required. While longer in design, they are engineered to maintain control and accuracy when used properly.

Applications

Commonly used for:

• Drilling in deep or obstructed areas
• Aircraft and aerospace maintenance
• Automotive and equipment repair
• Fabrication and assembly work
• General-purpose drilling in stainless steel, inconel, titanium alloy steel, tool steel, cast iron, mild and structural steel

Frequently Asked Questions

What is M35 cobalt steel?

M35 is a high speed steel alloy containing approximately 5% cobalt. The added cobalt increases hardness and heat resistance compared to standard M2 high speed steel.

How is M35 different from M2?

M35 contains cobalt, which improves red hardness and wear resistance. This allows it to perform better in stainless steel and high tensile strength materials.

What does a 135° split point mean?

A 135° split point is a self-centering drill tip that starts on contact and helps reduce walking. It requires less force and improves accuracy, especially when drilling in tight or awkward positions.

What materials can this drill bit drill?

This drill bit is suitable for aluminum, brass, copper, steel, plastic, and wood.

What is an aircraft extension drill bit?

This bit is designed for stainless steel, Inconel, titanium, alloy steel, cast iron, and other high tensile strength materials.

When should I use an aircraft extension drill bit instead of a jobber length bit?

Aircraft extension drill bits should be used when additional reach is required. For general-purpose drilling where reach is not a concern, jobber length bits are typically preferred due to increased rigidity.