Hymnorq 10-Piece 1/4" M35 Cobalt Drill Bits for Stainless Steel & Cast Iron
Product Description
Hymnorq 10-Piece 1/4" M35 Cobalt Drill Bits for Stainless Steel & Cast Iron
- INDUSTRIAL-GRADE M35 COBALT STEEL: Engineered with a premium 5% cobalt alloy (M35), these 1/4-inch drill bits offer exceptional heat resistance, superior strength, and unparalleled wear durability for tackling tough metals like stainless steel and cast iron.
- 135° SPLIT POINT FOR PRECISION: Designed with a 135-degree split point tip that self-centers instantly. This guarantees accurate, clean starts with minimal walking or sliding, even when drilling on challenging, hard, or curved metal surfaces.
- FULLY GROUND DUAL TWIST FLUTE: The precision-ground, dual-flute design significantly reduces operating friction and prevents heat buildup. This allows for smoother, faster chip removal and greatly extends the overall lifespan of the tool during heavy-duty use.
- SECURE STRAIGHT SHANK DESIGN: Features a standard jobber-length straight shank equipped with a chamfered end. This ensures a tight, slip-free grip in all standard drill chucks while allowing for incredibly smooth and fast bit changes.
- DURABLE TRANSPARENT STORAGE: Includes a rugged, clear polypropylene (PP) storage case to keep your 10-piece set securely organized and protected from moisture or damage. Easily identify your bits at a glance, maximizing efficiency for both DIYers and professionals.
OVERVIEW
Different types of drill bits are used to cut holes in different types of materials. 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.
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; this is an important factor in drilling hard materials because the friction of metal against metal can produce high temperatures that damage the material or the drill bit.
Tests shows that the M35 cobalt steel drill bits can penetrate a 5mm-thick 304 stainless steel plate in 5 seconds.
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.
NOTICE: Please use with cooling liquid to prolong the working life of the drill bits and to avoid overheating and breakage.
This set M35 grade cobalt drill bits are not suitable for hardened steel / high carbon steel.
TECHNICAL DETAILS:
Material: M35 Cobalt Steel
Angle Point: 135 Degree
Flute Type: Spiral
Hardness: Rockwell 67
Shank Type: Straight Shank
WHAT'S INCLUDED:
1/4" Cobalt Steel Drill Bit x 10pcs
Plastic Case x 1pc
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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