Diamond Drill
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What type of drill bit is strongest for drilling holes on hard metals such as harderned steel?
I went to DIY shop and saw many types of drill bits such as diamond, carbide, tungsten, high speed steel, cobalt, etc. But i am a layman where those materials are concerned. Any experienced handyman here who know what type of drill bits is best (and 2nd best if the price differ a lot) to drill holes in tough metal?
Thanks.
This depends on the hardness of the steel in question.
Ordinary twist drill bits are only about 65 rockwell C. (Nearly all steel bits are high-speed steels these days.) Hence they simply will not work on the hardest tool steels, and will wear very quickly on medium-hardness, high strength steels. The most practical option is to anneal the part before drilling or machining.
Cobalt bits are only slightly harder, maximum 67-68 RC. The advantage of cobalt bits is they have better heat resistance than high-speed steel bits, hence they can be used at somewhat more aggressive cutting rates and are less likely to burn up. For example, cobalt bits work well for stainless steels which have rapid work-hardening properties.
For drilling tool steels in the fully hardened condition, you need special-purpose tungsten carbide, diamond, or boron nitride tooling. You also generally need a milling machine. (Note:Masonry bits do not work well for this because the points on these bits are too broad. Masonry bits are designed to crush and grind, not cut.)
This is usually not worth the difficulty and expense anyway, it’s much easier to anneal first, then drill & machine, then re-harden.
Here you can find Diamond Drill items on Ebay:
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60mm Diamond coated drill bit bits hole saw core glass $10.99 |
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11 pieces set Diamond coated hole saw drill drils bit bits 3mm to 14mm $9.99 |
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Glass Plate Diamond Tipped Hole Saw Drilling Tool 70mm $10.66 |
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32mm Dia. Diamond Coated Marble Hole Saw Core Drill Bit $13.97 |
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Diamond Drill Glass Porcelain Concrete Terazzo 12 mm $36.26 |
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Marble Tile Diamond Tipped Drill Tool Cutter 32mm Hole Saw $6.15 |
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Marble Tile Glass Diamond Hole Saw Drilling Tool 24mm $5.42 |
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50 pieces jewelry diamond drill bits sea glass agate 1.5mm dremel $100.00 |
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30 Pcs 3mm Diameter Shank Diamond Point Grinding Burr Drill Bits w Case $8.97 |
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2 Pcs 3 x 6mm Diamond Drill Bits for Electronic Nail Files $3.06 |
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1mm Diamond Coated Twist Drill Bit,sea glass jewellery seashells, Hobby drill. $1.88 |
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1.5mm Diamond Coated Twist Drill Bit,sea glass, seashells, hobby, model making. $1.88 |
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Sintered Diamond Tipped 8mm Dia Marble Core Drill Bit $7.63 |
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2mm Diamond Coated Twist Drill Bit ,sea glass jewellery seashells hobby models $1.88 |
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Marble Tile Hole Saw Diamond Coated Drill Bit 22mm Dia. $8.84 |
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Stone Marble Diamond 16mm Dia. Hole Saw Drill Core Bit $8.72 |
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16mm Dia. Diamond Coated Marble Hole Saw Core Drill Bit $8.99 |
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Stone Marble Diamond Hole Saw Drill Core Bit 12mm Dia. $6.93 |
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30 Pcs 45mm Long 3mm Dia. Shank Diamond Grinding Burr Drill Bits $9.24 |
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8mm Diamond Hole Saw Drill Tool 4 Pcs for Marble Tile $5.79 |
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50mm Diameter Glasses Cutter Diamond Drill Hole Saw $6.89 |
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Diamond Tipped Metal Drill Bit Hole Saw 100mm for Glass $15.70 |
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4 Pcs Diamond Coated Marble Drill Bit 5mm Hole Saw $5.00 |
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10mm Dia. Lobated Diamond Tip Straight Drill Bit Tool $6.33 |
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Silver Tone 105mm Dia Diamond Glass Hole Saw Drill Bit $19.32 |
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Stone Marble Diamond 14mm Dia. Hole Saw Drill Core Bit $8.45 |
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Diamond Coated Drilling 8mm Dia. Hole Saw Glass Cutter $3.36 |
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38mm Diamond coated hole saw core drills w/ PILOT BIT $8.30 |
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Diamond Glass Hole Saw Drill Bit 100mm Cutting Diameter $17.41 |
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2 Pcs 3 x 5mm Diamond Drill Bits for Electronic Nail Files $4.00 |
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60mm Diameter Diamond Coating Tip Glass Drill Hole Saw $11.83 |
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Stone Marble Diamond 32mm Dia. Hole Saw Drill Core Bit $13.81 |
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Red Round Shank 10mm Diameter Diamond Tip Drill Bit New $6.33 |
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2 Pcs 3 x 6mm Diamond Drill Bits for Electronic Nail Files $7.16 |
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Diamond Tipped Drill Bit Cutting Hole Saw 6mm 1/4″ for Glass Tile Ceramic $4.01 |
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3mm x 5mm Nail Drill File Metal Diamond Prepper Bits 2 Pcs $3.99 |
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Diamond Tipped Tile Marble 6mm Hole Saw Drill Bit 4 Pcs $5.09 |
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DIAMOND DRILL BIT HOLE SAW WET/DRY CORE BIT GUIDE TILE 3/4, 1/2, 1, 1-1/2″ 3″ $34.50 |
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Silver Tone 105mm Dia Diamond Glass Hole Saw Drill Bit $16.46 |
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Marble Glass Tile Diamond Coated Drill Bit Hole Saw Tool 3/8″ 10mm Diameter $4.68 |
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Silver Tone 105mm Dia Diamond Glass Hole Saw Drill Bit $16.44 |
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28mm Dia. Diamond Coated Hole Saw Glass Drilling Tool $5.00 |
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Plasplugs Cool Cut Diamond Tile Drill Bit Floor Kit 5/16″ $9.99 |
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3pc Diamond Hole Saw Set – Core Drill – 1/4″,5/16″,3/8″ *SHIPS FROM USA* $6.49 |
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3/4″ Diamond Tile Glass Marble Hole Saw Drill bits $6.99 |
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9mm Cutting Dia Diamond Tipped Glass Hole Saw Drill Bit $3.57 |
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Glass Diamond Hole Saw Drilling Bit w 80mm Diameter $12.66 |
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8mm Dia. Drilling Diamond Coated Marble Glass Hole Saw $6.49 |
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5/8″ diamond tipped drill bit GLASS TILE GRANITE MARBLE $8.21 |
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12mm Diameter Diamond Tip Hole Saw Drill Core Bit Tool $7.06 |
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55mm Dia. Glasses Hole Saw Drill Bit w Diamond Tipped $7.11 |
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10mm Dia. Diamond Tipped Straight Shank Drill Core Bit $6.02 |
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25mm Diamond Hole Saw Drill Tool Blk for Tile Concrete $10.51 |
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Electric Diamond Drill Glass Cutting Hole Saw 60mm $9.08 |
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8mm Dia Marble Sinter Diamond Core Drill Bit Tool 2Pcs $7.76 |
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Marble Tile Hole Saw Diamond Coated Drill Bit 22mm Dia. $5.65 |
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11mm Cutting Diameter Diamond Glass Hole Saw Drill Tool $3.49 |
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2Pcs 12mm Diameter Marble Sinter Diamond Core Drill Bit $10.69 |
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Diamond Tipped Metal Hole Saw Drill Bit 9/16″ for Granite Tile Marble Cutting $8.05 |
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105mm Glass Drilling Tool Diamond Coated Metal Hole Saw $18.22 |
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14mm Dia. Diamond Tipped Marble Hole Saw Core Drill Bit $11.01 |
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Diamond Coated Drill Bit 85mm Ceramic Tile Glass Hole Saw $11.47 |
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12mm Diamond Hole Saw Drill Tool Blk for Concrete Tile $6.23 |
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Plasplugs Cool Cut Diamond Tile Drill Floor Kit 5/8″ $9.99 |
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Plasplugs Cool Cut Diamond Tile Drill Floor Kit 3/8″ $9.99 |
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Diamond Particles Coated Drill Bit 22mm Dia Tile Glass Hole Saw $4.04 |
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Plasplugs Cool Cut Diamond Tile Drill Floor Kit 1/2″ $9.99 |
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Plasplugs Cool Cut Diamond Tile Drill Wall Kit 3/8″ $9.99 |
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Diamond Coated Drill Bit 45mm Marble Hole Saw Kit $9.94 |
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Diamond Tipped Tile 28mm Diameter Hole Saw Drill Bit $12.34 |
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Diamond Tipped 60mm Diameter Marble Drilling Hole Saw $14.46 |
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Plasplugs Cool Cut Diamond Tile Drill Wall Kit 1/2″ $9.99 |
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Plasplugs Cool Cut Diamond Tile Drill Wall Kit 5/8″ $9.99 |
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Plasplugs Cool Cut Diamond Tile Drill Wall Kit 5/16″ $9.99 |
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Large 5 pcs Diamond Hole Saw Drill Bit Set 1/2″ – 1 3/8″ inch GRANITE GLASS TILE $32.99 |
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Neiko 5 pc Diamond Dust Hole Saw Set Tile Glass Drill $49.99 |
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Slate Tile Marble Hole Saw Diamond Core Drill Bit Cutting Tool 14mm 9/16″ Dia $7.44 |
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(2) pcs 14mm GLASS Tile Granite Marble glass DIAMOND DRILL BIT $14.00 |
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Glass Diamond Coated Hole Saw Drilling Tool 65mm Dia $9.51 |
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Marble Tile Diamond Hole Opening Saw Drilling Tool 42mm $10.46 |
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Diamond Particles Coated Drill Bit 22mm Dia Tile Glass Hole Saw $7.53 |
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Diamond Particles Coated Drill Bit 22mm Dia Tile Glass Hole Saw $4.58 |
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Diamond Tipped Drill Bit Cutting Hole Saw 6mm 1/4″ for Glass Tile Ceramic $3.95 |
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5 DIAMOND TILE GLASS MARBLE HOLE Saw LARGE Drill Bits $33.29 |
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5 pc Diamond Drill Hole Saw GLASS TILE Slate Ceramic $35.99 |
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2 pc DIAMOND TILE GLASS MARBLE HOLE SAW CORE DRILL BIT $17.99 |
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3mm x 6mm Nail Drill File Metal Diamond Prepper Bits 2 Pcs $3.79 |
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16mm Dia. Diamond Coated Marble Hole Saw Core Drill Bit $9.09 |
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12mm 1/2″ Diamond Tipped Drill Bit Hole Saw Cutter for Glass Tile Marble $4.88 |
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Diamond Tipped Drill Bit Hole Saw 5/16″ 8mm for Ceramic Tile Glass Cutting $3.34 |
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9mm Cutting Dia Diamond Tipped Glass Hole Saw Drill Bit $3.73 |
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Pair Diamond Barrel Small Bit 3mm Dia Shaft for Nail Drill $3.82 |
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2 Pcs Diamond Barrel Large Bits 6mm Shaft for Nail Drills $5.53 |
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10mm 3/8″ Ceramic Marble Glass Hole Saw Diamond Core Drill Bit Cutting Tool $4.84 |
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Diamond Tipped Tile 28mm Diameter Hole Saw Drill Bit $15.88 |
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3mm x 6mm Nail Drill File Metal Diamond Prepper Bits 2 Pcs $2.97 |
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Glass Tile Marble Diamond Coated Drill Bit Hole Saw Tool 8mm 5/16″ Diameter $7.54 |
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Diamond Tipped Tile Marble 6mm Hole Saw Drill Bit 4 Pcs $5.07 |
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5 piece set diamond tipped drill bit glass tile granite marble stone * $29.99 |
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30mm Dia Diamond Coated Marble Tile Drill Hole Saw $7.29 |
Tags: bit, cutting, diamond, diamond drill, diamond drill bit home depot, diamond drill bits, diamond drill bits for dremel, diamond drilling, drill, tools