Makita D-17435 HSS-Co Metal Drill Bit 8.5 x 117 mm

The Makita D-17435 HSS-Co metal drill bit is a professional-grade tool engineered for high-performance drilling in demanding materials. With a diameter of 8.5 mm and a total length of 117 mm, this drill bit is constructed from high-speed steel alloyed with 5% cobalt, providing superior heat resistance and structural integrity during intensive use. The precision-engineered split point design ensures accurate centering and prevents the bit from walking on the workpiece surface, resulting in clean and consistent holes.

Advantages

The primary benefit of this cobalt-alloy drill bit is its exceptional durability when working with hard metals and stainless steel. The inclusion of 5% cobalt significantly extends the tool life by maintaining hardness at elevated temperatures, which is critical during prolonged drilling operations. Its cylindrical shank design ensures compatibility with a wide range of standard drill chucks, while the split point geometry reduces the required feed pressure, allowing for faster and more efficient material penetration without compromising precision.

Suitable for

• Drilling into stainless steel
• Working with hard alloyed metals
• General metal fabrication and workshop tasks
• Industrial maintenance and repair projects

This drill bit is not intended for use on masonry, concrete, or soft wood, as the specialized cobalt geometry is optimized specifically for metal cutting. It may also be less effective when used with low-torque or non-variable speed drills that cannot maintain the consistent pressure and rotation speed required for drilling into hardened steel.

Key specifications

• Diameter: 8.5 mm
• Total length: 117 mm
• Material: HSS-Co (5% Cobalt)
• Shank type: Cylindrical
• Tip geometry: Split point

To use the Makita D-17435, ensure the drill bit is securely fastened in the chuck of your power tool. Mark the center point of the hole to be drilled to assist with the split point's self-centering capability. Apply steady, firm pressure while maintaining a moderate drilling speed. It is essential to keep the drill bit aligned perpendicularly to the workpiece surface to prevent breakage or uneven hole formation.

What to consider before purchase

• Verify that your drill chuck supports an 8.5 mm cylindrical shank.
• Ensure your power tool is capable of the lower RPMs often required for drilling stainless steel.
• Consider using a cutting fluid or lubricant to further extend the life of the bit when drilling hard metals.

Usage recommendations: For optimal results and to prevent overheating, use a high-quality cutting oil during the drilling process and clear metal chips frequently from the hole. Always wear appropriate eye protection and secure the workpiece firmly before starting.