Price: $39.79
(as of May 09,2021 23:22:06 UTC – Details)

Product Description

M35 cobalt steel hss-co twist drill bits set for stainless steelM35 cobalt steel hss-co twist drill bits set for stainless steel

Hymnorq metric cobalt twist drill bitsHymnorq metric cobalt twist drill bits

Drill Bit for Metalworking

Hymnorq LogoHymnorq Logo

About Hymnorq Brand

“Hymnorq” is a registered brand hold and exclusively sold by Migiwata Company, a famaliy owned and operated business selling quality products.We’ve been always standing by every piece of product sold from our store.PS: A few packages of our products in stock were labelled as Migiwata brand.

Hymnorq M35 5% Cobalt Steel Twist Drill Bits Set

A nice-to-have imperial fractional inch 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.

Key Features

135 degree split point self-centering

135 degree split point self-centering

u flute fully ground

u flute fully ground

straight round shank

straight round shank

135 Degree Split Point

135 degree means less force required to remove metal, compared with lower angles like 90° and 118°.Self-centering split point allows you to drill directly to the size needed without any pre-drilling.

Twist Drill Bit Body

Heavy-duty, fully ground body construction.High flow spiral design for the fastest removal rate and for thick material.

Straight Shank

Straight shank for standard drill chuck, less “walk“ or ”wander“.The end of shank is chamfered to allow easy and firm holding.Special bronze SST heat and surface treatment.

Make Most of Cobalt Drill Bits with These Tips

Be vertical when you use cobalt bits to drill

Be vertical when you use cobalt bits to drill

cobalt drill bit low speed rpm

cobalt drill bit low speed rpm

cobalt drill bit cooling liquid drill metals metalworking

cobalt drill bit cooling liquid drill metals metalworking

use drill press

use drill press

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

Fractional Inch

Fractional Inch

Fractional Inch

Fractional Inch

Metric

Metric

5% Cobalt Steel

Organizer

ABS Plastic Index Case

Metal Index Case

Plastic Bag

ABS Plastic Index Case

Metal Index Case

ABS Plastic Index Case

Size Range

1/2″

1/16″ – 1/4″

3/64“ – 3/32”

1/16“ – 1/2”

1.5mm – 6.5mm

1.5mm – 10mm

135º Split Point

Manufacturing Standard

German DIN338

German DIN338

German DIN338

German DIN338

German DIN338

German DIN338

Manufacturing Technology

Fully Ground

Fully Ground

Fully Ground

Fully Ground

Fully Ground

Fully Ground

COBALT STEEL – Manufactured from M35 grade cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, with up to twelve times when compared with an average HSS drill bit.
FOR STAINLESS STEEL – Particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials, too. Not for hardened steel / high carbon steel. Try to adjust the RPM when it fails to penetrate.
SELF-CENTERING – The 135° quick-cut split points are self-centered and will penetrate quickly with less pressure. No center punch is needed. Will not “walk” or “wander”.
5PC SET – The set includes 5pcs of 1/2” diameter fractional inch size M35 grade cobalt steel twist drill bits, packed in a convinient plastic case. Total lenght: 5.98 inch; working length: 4.49 inch.
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.