Hymnorq 3/8 Inch M35 Cobalt Drill Bit Set, 5-Piece for Steel & Hard Metals
Product Description
Hymnorq 3/8 Inch M35 Cobalt Drill Bit Set, 5-Piece for Steel & Hard Metals
- POWER THROUGH HARD METALS: Crafted from premium M35 high-speed steel with 5% cobalt content. These 3/8" drill bits deliver exceptional heat and wear resistance, effortlessly cutting through tough materials like stainless steel, cast iron, and heavy-duty alloys.
- NO-WALK 135° SPLIT POINT: Frustrated by wandering bits? Our precision-ground 135-degree split point bites into metal instantly. This self-centering design ensures accurate, clean starts without walking, even on curved or hardened surfaces.
- OPTIMIZED CHIP CLEARING: Engineered with a fully ground dual twist flute that minimizes friction and prevents heat buildup. This design rapidly ejects metal chips and debris, providing a smooth, fast, and continuous drilling experience.
- SECURE & FAST CHUCKING: The straight shank offers a stable, wobble-free fit in all standard drill chucks. We’ve also added a chamfered shank end, allowing for much quicker and smoother bit insertions during high-paced projects.
- PROTECTED & ORGANIZED: Includes 5 identical 3/8-inch bits (Total Length: 5", Flute Length: 3.62") packed in a rugged, transparent PP plastic storage case. Easy to carry, visually accessible, and perfectly protected for your professional toolbox or home workshop.
M35 Grade Cobalt Steel
Cobalt drill bits are not made of pure cobalt, but rather a steel alloy with certain percent cobalt. The 5-percent alloy is known as M35 grade. The cobalt increases the strength of the steel and makes it more heat-resistant.
135 Degree Split Point
The flater the drill, the smaller the chip width. This means less force required to remove metal, compared with lower angles like 90° and 118°. This is important on hard stuff, because your power requirements are already more than mild steel, so making the chip load less helps. It also reduces heat since less surface area is generating the cut.
Lowest Cost Per Hole Drilled
Cobalt drill bits are more expensive than other drill bits, but if you regularly drill through metal, they are a good investment since they tend to last longer. With an extended tool life, Hymnorq cobalt drill bits will give you the lowest cost per hole drilled.
For Drilling Stainless Steel
This set of M35 cobalt steel drill bits are particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials, too.
Tests shows that the M35 cobalt steel drill bits can penetrate a 5mm-thick 304 stainless steel plate in 5 seconds.
Not Suggested for Hardened Steel
M35 grade cobalt drill bits are NOT suitable for hardened steel, high carbon steel and heat-treated steel by the experiences of some customers, although some others said they worked well with hardened steel.
Cooling Liquid Required
Please use with cooling liquid to prolong the working life of the drill bits and to avoid overheating and breakage.
BUY WITH CONFIDENCE:
If you're not completely satisfied with the product quality, please contact us. Refund or free replacement.
Technical Specifications
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