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40PC M35 Cobalt Steel Twist Jobber Small Drill Bits, 4 Sizes 3/64 Inch 1/16 Inch 5/64 Inch and 3/32 Inch, 135 Degree Pilot Split Point, Extremely Heat Resistant, for Stainless Steel

COBALT STEEL - Manufactured from M35 cobalt steel, with molybdenum and cobalt added to create a hardened heat-resistant alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, with up to twelve times compared with an average HSS drill bit.
40PC FRACTIONAL INCH BITS - The set includes 40pcs of M35 cobalt steel twist drill bits, 3/64" x 10pcs, 1/16" x 10pcs, 5/64" x 10pcs, and 3/32" x 10pcs. Manufactured to German DIN338 standard. Packed in a plastic bag.
FOR METALWORKING - Particularly successful in cutting through hard metals(hardness less than HRC38°) such as stainless steel and cast iron, although they can be used for softer materials like copper and aluminium, too. Not for hardened steel / high carbon steel. Try to adjust the RPM when it fails to penetrate.
DOWNLOADABLE USER GUIDE - We've summed up some tips of drilling metals, including a RPM chart for several common metals, based on our reviews and some articles on the internet. In most cases, our customers would get a much better result with these tips. Welcome to download.
LENGTH OF THE BITS: 3/64(1.73"), 1/16(1.89"), 5/64(2.01"), 3/32(2.24").

Product Description

40PC Cobalt Steel Tiny Inch Drill Bits for Steel

Bulk fractional Inch drills in popular hobbyist sizes
Extras in each size to prepare for potential breakage, which happens to small bits more or less

Drill Bit for Metalworking

About the Bits Size

These bits are small.

Please read the description and look at the pictures carefully to make sure this bits set is what you need.

Hymnorq M35 5% Cobalt Steel Twist Drill Bits Set

A nice-to-have metric bit set for repeated drilling in metals

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.
Lowest Cost Per Hole Drilled - Cobalt bits are more expensive than ordinary HSS drill bits. But if you regularly drill metals, they are a good investment since they tend to last longer. With an extended life, you can lower cost per hole drilled.

Tech Tip 1: You shouldn’t drill deeper than 1/2 of the drill bit’s fluting length to have the best drilling performance.
Tech Tip 2: Don't use M35 cabalt bits on hardened steel, high carbon steel and heat treated steel.

All for Your Successful Drilling in Metal

Selected M35 Cobalt Steel Raw Material

5% cobalt added for

Higher heat resistance
Faster speeds
Higher feed rates

High Level of Craftsmanship

Advanced machines
Experienced workers
Precision grinding technique
Smoother hardened surface

Strict Inspection

Every piece of bit is inpected by precision instrument before being packed
Quality never comprised

Make Most of Cobalt Drill Bits with These Tips

Be Vertical

Keep the drill bit vertical with the stuff's surface to be drilled.
Tilted bit is prone to break during drilling.
Be sure to make both the bit and the workpiece stable.

Do It Slow

Drilling metal requires low RPM. Please use a device of which the drilling speed can be adjusted.
Be careful when you use an electric drill. The RPM could be set too high.
The thicker the bit, the slower speed should be.
If you're not sure, please start from the lowest RPM and pressure.

Stay Cool

Friction between bit and metal will accumulate an amount of heat.
It's necessary to use cooling liquid during drilling to keep the bit cool. Otherwise, the bit may fry(melt) or only last a short time.
It's both ok to use lubricant oil and to pour water.

Right Drilling Device

It's highly recommended that you use a drill press to drill thick metals. It's stable, powerful and (RPM) adjustable.
If a drill press isn't available, electric drill or charging drill will do the job, too. However, it's more likely you'll meet problems unless you're really experienced.

Measurement System	Metric	Fractional Inch	Metric	Metric	Metric
5% Cobalt Steel	✓	✓	✓	✓	✓
Organizer	Plastic Bag	Plastic Bag	Plastic Index Case	ABS Plastic Index Case	Metal Index Case
Size Range	1mm - 3mm	3/64" - 3/32"	1.5mm - 6.5mm	1.5mm - 10mm	1mm - 10mm
135º Split Point	✓	✓	✓	✓	✓
Manufacturing Standard	German DIN338	German DIN338	German DIN338	German DIN338	German DIN338
Manufacturing Technology	Fully Ground	Fully Ground	Fully Ground	Fully Ground	Fully Ground

Style	40pcs inch 4size
Material	Cobalt Steel
Cutting Angle String	135 Degrees
Is Discontinued By Manufacturer	No
Shank Type	Straight
Country of Origin	China
Cutting Diameter	3/64", 1/16", 5/64", 3/32" Inches
Finish Type	Bronze Oxide
Package Dimensions	5.9 x 3.2 x 0.5 inches; 0.81 Ounces

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