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Shop / drill hog cobalt

HYMNORQ 40PC Cobalt Steel Twist Jobber Drill Bits for Stainless Steel, 4 Sizes

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$ 12.56   $8.79   save 30%
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Product Description: 40PC Cobalt Steel Tiny Inch Drill Bits for Steel

This set includes 40 fractional inch drill bits that are specifically designed for metalworking. Each bit is crafted from premium M35 grade cobalt steel, which contains 5% cobalt—a robust steel alloy that enhances strength and heat resistance. Given the nature of small drill bits, we provide extras in each size to account for potential breakage, a common issue with smaller bits.

Key Features of the Drill Bits:

  1. Superior Material Composition: The M35 Cobalt Steel, a combination of cobalt and steel, offers unmatched durability and heat resistance. Though cobalt bits are pricier than standard HSS drill bits, they are a worthwhile investment. Their extended lifespan significantly reduces the cost per hole drilled, making them more economical for frequent metal drilling tasks.

  2. Optimal Drilling Performance: It's crucial to avoid drilling deeper than half the length of the bit's fluting for the best performance. Additionally, it’s recommended to refrain from using M35 cobalt bits on hardened steel, high carbon steel, or heat-treated steel.

High-Quality Craftsmanship:

Our bits are manufactured with advanced machinery and skilled workers using precision grinding techniques, ensuring a smooth hardened surface. Each bit undergoes stringent inspections with precision instruments before packing to guarantee top-tier quality.

Maximize Your Drilling Success with These Tips:

  1. Maintain Vertical Alignment: Always keep the drill bit vertical relative to the surface you are drilling. A tilted drill increases the risk of breakage. Ensuring stability for both the bit and the workpiece is essential.

  2. Adopt a Slow Drilling Speed: When drilling metals, use low RPM settings. Choose a drill with adjustable speeds, as a high RPM can be detrimental, especially for thicker bits. If unsure, start with the lowest speed and apply gentle pressure.

  3. Keep It Cool: To manage heat generated by friction, use a cooling liquid while drilling. Both lubricant oil and water are effective options to prevent the bit from melting or wearing down prematurely.

  4. Use the Right Equipment: For drilling thicker metals, a drill press is highly recommended due to its stability and adjustable RPM. If a drill press is unavailable, an electric or cordless drill can work; however, keep in mind that less experienced users may encounter difficulties.

Product Specifications:

  • Bit Sizes: 3/64" (1.73"), 1/16" (1.89"), 5/64" (2.01"), 3/32" (2.24")
  • Material: M35 Cobalt Steel (with 5% cobalt)
  • Packaging: Each set is conveniently packed in a plastic bag.
  • Manufacturing Standard: German DIN338, fully ground for precision.

Performance and Applications:

These drill bits excel at cutting through tough metals—such as stainless steel and cast iron—with a hardness less than HRC38°. They are also effective with softer materials like copper and aluminum. However, they should not be used for hardened steel or high carbon steel.

A downloadable user guide accompanies the product, providing effective drilling tips and an RPM chart tailored to various metals, enhancing your overall drilling experience.

Customer Feedback:

  • Rated 4.3 out of 5 stars (453 reviews for select sizes).
  • Available options range from 40PC, 50PC, 13PC, 15PC, to 19PC sets, at competitive prices.

Whether you are a hobbyist or a professional seeking to optimize your metalworking tasks, this set of 40PC cobalt drill bits promises reliability and efficiency. Don’t miss the chance to elevate your drilling game!

product information:

AttributeValue
is_discontinued_by_manufacturer‎No
package_dimensions‎3.11 x 2.2 x 0.47 inches; 1.41 ounces
date_first_available‎May 1, 2019
manufacturer‎Hymnorq
country_of_origin‎China
best_sellers_rank#246,281 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
#600 in Jobber Drill Bits
customer_reviews
ratings_count453
stars4.3

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