Cobalt Drill Bits
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Are cobalt drill bits solid throughout, or just coated?
Titanium bits are just coated, so if you sharpen them, they’re not as good as new. Are cobalt bits the same way, or are they made of a homogeneous substance rather than being coated. I want some good metal drilling bits, but I won’t invest in cobalt if I can’t resharpen them w/ a Drill Doctor. Please give a reference, if you can, as well as any personal experience w/ good bits.
Well so far I’ve got one answer either way, but neither with a source to corroborate. At least I’m getting some other good info.
Drill Doctor may not be optimal, but I can’t see myself trying to sharpen smaller bits manually with a grinder.
Cobalt drills are not coated. They maintain their hardness throughout and can be resharpened without loss of hardness. Stay away from the imports. I have found that the best cobalt and HS drill bits are Cleveland twist drills. Also, I’m not a big fan of the Drill Doctor. With a little practice you can achieve better results sharpening them by hand on a bench grinder.
Here are some excellent bargains on ebay for Cobalt Drill Bits
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NEW 29 pc. 135 deg Split Point Cobalt Drill Bit Set $70.49 |
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New 5pc Metrtic MM Step Drill Bit Set w/CASE HSS Cobalt Coated Uni Drill $0 Ship $27.25 |
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7/16″ Cobalt Drill Bit by Irwin 3016128 $9.99 |
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5 Pc Cobalt Step Drill Bit Set High Speed Steel SAE Step Bit Set $36.00 |
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10 Pcs HSS Cobalt Coated Step Drill Bit Set SAE & MM Metric Aluminum Case $54.50 |
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1 15/32 “Cobalt Drill Bit Master Machanic CARBIDE TIP $2.99 |
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DOUBLE ENDED SPLIT POINT DRILL BITS 1/8″ – Made from Cobalt Steel M35 $2.99 |
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Spotweld Cutter – 1/4″ – Made from Soild Cobalt with Titanium Nitrate Coating $4.99 |
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Spotweld Cutter – 5/16″ – Made from Soild Cobalt with Titanium Nitrate Coating $5.99 |
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Spotweld Cutter – 3/8″ – Made from Soild Cobalt with Titanium Nitrate Coating $5.99 |
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13PC COBALT-COATED STEEL DRILL BIT SET w/118° POINT $3.95 |
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DRILL BIT SET MAC TOOL COBALT GRADE $70.00 |
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Hanson 10pc Extractor Set w/Left Hand Cobalt Drill Bits $42.99 |
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All size 5 pc HSS Cobalt Coated Step Drill Bits New $26.10 |
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Vermont American 1/16″, 3/32″, 3/16″, 5/32″ 7/32″ Drill Bit Cobalt #4118 $15.49 |
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17 Pcs Cobalt Silver & Demming Drill Bit Set bits New $999.99 |
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8pc Cobalt Silver & Demming Drill Bit Set bits New Bit $79.99 |
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Step Drill Bits 5pc HSS Cobalt SAE w/Case – 50 sizes $32.95 |
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Hanson 30519 Mechanics Length LH Cobalt HSS Drill Bits $17.91 |
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Hanson 30516 Mechanics Length LH Cobalt HSS Drill Bits $25.93 |
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Hanson 3016132 6″ Long Cobalt HSS Drill Bit – 1/2″ $26.92 |
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Century Drill and Tool 26208 Cobalt Bit, 1/8-Inch $14.55 |
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NEW 13/32×5-1/4 Cobalt Hss-3/8 Rs Irwin Ea. Cobalt Bits – Carded 3016026 $14.91 |
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DeWalt 1/2″ Pilot Point Cobalt Drill Bit $19.70 |
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COBALT 115 PIECE PREMIUM DRILL BIT SET AGGRESSIVE 135 DEGREE TIPS METAL CASE NIB $179.95 |
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COBALT 29 PIECE PREMIUM DRILL BIT SET AGGRESSIVE 135 DEGREE TIPS METAL INDEX NIB $89.95 |
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Craftsman 964086 Drill Bits Professional Cobalt 1/16″ to 1/2″ Set of 29 $69.99 |
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AHN-3016132 IRWIN HANSON Cobalt HSS Jobber Length, Straight Shank Drill Bit $19.20 |
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AHN-3016008 IRWIN HANSON Cobalt HSS Jobber Length, Straight Shank Drill Bit $12.76 |
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AHN-3016009 IRWIN HANSON Cobalt HSS Jobber Length, Straight Shank Drill Bit $12.84 |
And a few more great deals on Amazon:
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29 PC COBALT DRILL BIT SET $86.89 Features and Benefits: Meets ANSI standards Ideal for many applications Bores stainless, silicon-chrome; chrome-nickel, and other metals 118 degree tip Last 2 times longer than most drill bits The Mountain (MTNXDBS29CO) 29 piece drill bit set is the ideal companion to most technicians or shops tool boxes. This durable bit is ideal for most jobs where you need a touch bit for drilling metals…. |
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Hanson 29 Piece Cobalt M-42 Metal Index Drill Bit Set – HAN3018002B $126.35 Features and Benefits: Cobalt steel extends cutting edge life and largetains cutting life after resharpening Extra hard drill for greater wear 135 degree split point tip starts on contact, cuts with less force Rubber overmolded case protects kit if dropped Tap and Drill selection chart for convenience reference Automatic indexing for easy bit access and identification. Removable cartridges: easy… |
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29PC DRILL BIT INDUSTRIAL SET CASE; COBALT $166.38 Features and Benefits: Cobalt steel extends cutting edge life and maintains cutting life after resharpening Extra hard drill for greater wear 135 degree split point tip starts on contact, cuts with less force Rubber overmolded case protects kit if dropped Tap and drill selection chart for convenient reference Automatic indexing for easy bit access and identification. Removeable cartridges: easy … |
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Drill Doctor DD750X Drill Bit Sharpener $197.95 Make your work faster and easier while saving yourself money sharpening your dull and broken drill bits with the Drill Doctor 750X 3/32- to 3/4-Inch Drill Bit Sharpener. Designed for the serious tool user, this professional, easy-to-use system makes it simple to keep a sharp, perfectly angled cutting edge on bits you use often, and it can even be used to put an edge back on broken bits. .capti… |
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DEWALT DW4701 Industrial 4-1/2-Inch Dry or Wet Cutting Continuous Rim Diamond Saw Blade with 7/8-Inch Arbor $41.78 The DEWALT DW4701 is a great addition to your 4-to-4-1/2-inch grinders. With an advanced diamond matrix, this blade provides a longer life and improved grinder application. It’s designed for consistency, with a straight and dependable depth of cut and a greater life span by 100 times more than the industry standard. Use this blade on a variety of tough applications, including concrete, st… |
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Dewalt DW1263 14-Piece Cobalt Pilot Point Twist Drill Bit Set $19.99 The DeWalt DW1263 14 Piece Cobalt Split Point Bit Assortment includes a selection of commonly used bits that have been precision crafted to provide improved durability and faster cutting. Featuring a pilot point tip design that reduces walking at startup to provide you with more precise performance, these industrial-strength Cobalt bits make quick work of tough tasks like drilling through stainles… |
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Mibro 492470 17-Piece Cobalt Metal Master Set, 1/6-Inch to 3/8-Inches $34.88 … |
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Spiral Flute Extractors and Cobalt Drill Bit Sets – 10 pc set spiral flute s $29.96 585-11119 Features: -Extractor Screw Diam: 5/64 in, 7/64 in, 5/32 in, 1/4 in, 19/64 in.-Price is for 1 Each. Includes: -Includes: Extractors, Drill Bits, Metal Case…. |
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24 X 1/2 Auger Drill Bit $11.95 … |
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Reef Men’s Leather Smoothy Sandal $44.00 Online Exclusive! Stay in the times this season with Reef. Reef brown distressed leather sandals. Soft arch foot bed. Fabric lined strap. Signature logo on strap, foot bed, and outsole…. |
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