M35 Cobalt Drill Bit Set Inch Jobber Length Twist Drill Bits for Stainless Steel Hard Metals Split Point SAE ASME

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Authentic Premium M35 HSS Co5% Cobalt Alloy Steel

Made from genuine M35 high-speed steel with 5% cobalt content, this drill bit offers high hardness, excellent heat resistance, and strong wear resistance. It is designed for stable and reliable drilling in stainless steel and other hard metal materials.

CNC Precision Fully Ground for Cleaner and More Efficient Drilling

CNC precision fully ground flutes provide sharper edges, more accurate geometry, and lower runout for smoother starts and more stable drilling. This helps improve hole accuracy, reduce vibration, speed up chip removal, and deliver cleaner, more efficient drilling in stainless steel and other hard metals.

135° Split Point for Faster Penetration

On sizes 1/8" and up, the 135-degree split point helps reduce walking, improves centering, and enables faster penetration with less thrust force.

Secure 3-Flats Shank Design (3/16" and Above)

Smaller sizes use a round shank for precise centering and stable rotation. Sizes 3/16" and above feature a 3-flats shank design to reduce slipping and improve torque transfer during drilling.

Gold Oxide Surface Treatment

The gold oxide finish helps reduce friction and heat buildup during drilling. It also improves chip evacuation and enhances corrosion resistance for smoother and more consistent cutting performance.

Number Sizes #1–#60

Letter Sizes A–Z

Notes

Use cutting oil or coolant during drilling to reduce heat buildup and extend tool life.
Recommended for rotary drilling only. Not suitable for hammer or impact mode.
Apply steady pressure and moderate speed, especially when drilling stainless steel and other hard metals.

Multiple Set Options for Different Drilling Needs

We offer multiple choices in different piece counts, packaging styles, and size ranges to meet different drilling needs.
Plastic box sets and metal box sets are both available. Smaller sets are suitable for common daily drilling work, while larger sets provide broader size coverage for workshop, maintenance, and professional applications.
Buyers can choose the most suitable specification according to their required sizes, usage frequency, and storage preference. Please check the SKU options carefully before placing an order.

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Orders leave the warehouse within one business day. Delivery then takes 8 to 14 days. Orders over $150 ship free.

Not right for you? You have 30 days from delivery, with no restocking fee. See the full returns policy.