The press hardening method is altogether economical by creating advanced high-strength steels that are three times as strong as the material used to create it. Beyond that, it can create complex shapes that remove the need to use multiple heavy shapes welded together. Instead, it can a single strong, lightweight, and lower cost automotive component that is ultimately safer, lighter, and smarter than before.

Specifically Designed for Drilling Holes In     Glass Marble Limestone Slate   Glass Jars Ceramics Porcelain Granite   Stained Glass Ceramic Tile Porcelain Tile Stone   (Designed for materials to about 1/2" Thick)

DT-503  1/8" Diamond Tip Drill (3.3mm/.13")    See Detail Page for Pictures & Specs ea  12.9512+ 11.3628+   9.6785+   8.44

--- Item --- Price Qty / Order?   TL-340  1/8" Solid Diamond Tipped DrillOut of Stock - Discontinued                        (Shaft size 1/8") 27.95

Diamond Drill Bitfor grinder

Need Express Delivery?         Not sure what type drill bit you need? Check out our Drill Bit Section Summary Page! Diamond Drill Bit Tile Drill Bit, Glass Drill Bit Diamond Tip Drill Bit, Diamond Hole Saw Specifically Designed for Drilling Holes In     Glass Marble Limestone Slate   Glass Jars Ceramics Porcelain Granite   Stained Glass Ceramic Tile Porcelain Tile Stone   (Designed for materials to about 1/2" Thick) Electroplate Bonded Diamond Tip Drills Diamond Drill Bits, are also know as a Diamond Tip Drill or Diamond Hole Saw.  They are often thought of as a Glass Drill Bit or Tile Drill Bit, but a Diamond Tip Drill Bit is much more versatile since they are used to drill glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, granite, light stone, and fiberglass.  Water is required for lubrication when drilling. Old fashioned Spear Point carbide bits no longer workon the new type of super-hard floor, counter and wall tiles.Diamond Drill Bits are the solution. Hole Saw style drill bits have a hollow center and cut a circle in the material to create a hole. This results in a hole the size of the bit and a smaller "plug" or "core" which comes from the center.  They are sometimes referred to as a Core Drill Bit, however, technically core drill bit sizes relate to the size of the core, not the hole size.  The Drills are available below in sizes from 5/64" to 5-1/2" (outside diameter).  The metric manufactured size of each bit is also shown below (mm), along with the exact inch measurement of each bit. Diamond bits are easy to use, however, there are many special techniques which are different from standard steel-bit drilling.  Usage can also vary depending upon the type and the specific manufacturer.  To assist our customers, we have compiled an extensive and detailed Drilling Tips & Techniques section. .       Recommended Drill Speeds DiamondSure - Bonded Bits Recommended Drill Speed (rpm) Material         Bit Size -->  1/2" 1" 2" 3" 4"  Fiberglass 1200 700 350 250 175  Glass, Ceramic & China 800 500 250 160 125  Limestone & Marble Stone 600 450 225 130 100  Ceramic Wall Tile 600 450 225 130 100  Porcelain Wall Tile 500 375 180 125 90  Porcelain Floor Tile 500 375 180 125 90  Granite Stone 400 300 150 100 75 (Not for use on Concrete or for depths beyond about 1/2") SPEED KILLS:  Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably. . Because these drill bits are used to drill in extremely hard materials, it is very important to use proper drill pressure to keep from overheating the bit.  Excessive pressure is merely converted to heat energy and can burn up a bit very quickly. .           Recommended Drill Head Pressure Material Drill Head Pressure *  Fiberglass 10 to 15 lbs.  Limestone & Marble Stone 12 to 18 lbs.  Glass, Ceramic & Porcelain China 12 to 18 lbs.  Ceramic or Porcelain Wall Tile 15 to 20 lbs.  Porcelain Floor Tile 18 to 30 lbs.  Granite Stone 18 to 30 lbs. * WARNING:  Drill press arm leverages hand pressure by a factor of about 6 to 8.  So 2 lbs. of hand pressure on the drill press arm will apply about 14 lbs of pressure to the drill head. All these drill bits have shaft sizes of 3/8" or less, for use in standard drills.  For detailed drill bit size information (total length, shaft length, bell length, etc) - Click on the Detail Page link for each drill bit listed below. IMPORTANT Diamond drill bits require the use of proper lubrication, correct drill speed and proper pressure.  Drilling methods and techniques vary significantly depending upon the material being drilled. Not for use on Concrete or with Hammer-Impact Drills, or for depths beyond about 1/2" Please See: Drilling Tips & Techniques

As noted in the properties section above, press hardening can achieve strength levels of 2000 MPa, along with highly complex micro-geometry.

DT-528  1-3/4" Drill Bit (44.7mm/1.76')    See Detail Page for Pictures & Specs ea  44.954+  39.9610+ 34.1732+  29.64

DT-515  3/8" Diamond Tip Bit (9.7mm/.38")    See Detail Page for Pictures & Specs ea  16.959+  14.9622+ 12.7768+ 10.94

Old fashioned Spear Point carbide bits no longer workon the new type of super-hard floor, counter and wall tiles.Diamond Drill Bits are the solution.

Hollow CoreDiamond drillBits

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DT-508  5/16" Drill (8.1mm/.32")    See Detail Page for Pictures & Specs ea  15.959+  13.9624+ 11.9772+ 10.34

The strength of press-hardened steels can reach as high as 2000 MPa (215ksi), with a 1000MPa (145 ksi) yield stress total.

Direct, in which the steel is first superheated in a furnace, formed while it is still hot, and then quenched while within the die. The process goes like this:

All these drill bits have shaft sizes of 3/8" or less, for use in standard drills.  For detailed drill bit size information (total length, shaft length, bell length, etc) - Click on the Detail Page link for each drill bit listed below.

DT-521  1-1/8" Bit (28.8mm/1.13")    See Detail Page for Pictures & Specs ea  30.956+  27.2614+ 23.2745+ 20.14

DT-520   1"   Drill Bit (25.7mm/1.01")    See Detail Page for Pictures & Specs ea  29.956+  26.3614+ 22.4745+ 19.44

Press-Hardened Steels are Boron added (.001%-.005%) Carbon /Manganese steels that have been in use since the mid 1980’s for automotive body in white construction.

DT-534  2-1/4" Drill (57mm/2.25")    See Detail Page for Pictures & Specs ea  56.953+  51.267+  43.8724+  38.24

Indirect, in which the steel is pre-formed and trimmed at room temperature based upon the incoming steel properties prior to Hot Forming. Parts are then heated and areas that are too difficult to cold form are Hot formed to achieve higher strength and final shape.

Go to top of PgReturn to Previous Section Half-Circle shaft profileshown in lower left of picture. Diamond File General Purpose File With 'Half-Circle' Shaft Profile Diamond coated file is 7" long with "half-circle" shaft.  A perfect general purpose file for use on flat, rounded or curved edges.  Use on glass, stained glass, ceramic, marble, stone, fiberglass or plastic.  Blade of file is 3/8" wide, tapering to a point.  Perfect for filing off sharp edges, reshaping cuts or reaming drilled holes.  Handle is vinyl coated for safety and comfort.DF-151  7" Diamond 'Half-Circle' File ........... ea 12.95 / 3+ 11.63 / 8+ 9.29                                  Sorry - Out of Stock

Since Glastar Diamond Tip Drill Bits have a solid rounded tip, they are slightly easier to start when drilling on a curved surface, such as a bottle, when compared to using a Core drill bit, above.  However, since solid tip drill bits drill out the complete hole, they also drill more slowly than the hollow core style bits and they are generally not used on the super hard abrasive materials such as ceramic tile, porcelain tile, floor tile, limestone, slate, marble, granite or other stones.  Hollow core style drill bits are recommended for drilling in these very hard materials and are available from 1/8" to 4" in the section, above.  See also How to Use Diamond Bits.

DT-516  1/2" Diamond Bit (12.9mm/.51")    See Detail Page for Pictures & Specs ea  18.958+  16.7620+ 14.2764+ 12.34

Hole Saw style drill bits have a hollow center and cut a circle in the material to create a hole. This results in a hole the size of the bit and a smaller "plug" or "core" which comes from the center.  They are sometimes referred to as a Core Drill Bit, however, technically core drill bit sizes relate to the size of the core, not the hole size.  The Drills are available below in sizes from 5/64" to 5-1/2" (outside diameter).  The metric manufactured size of each bit is also shown below (mm), along with the exact inch measurement of each bit.

Drill bit Diamondtip

DT-546  3-1/2" Drill Bit (89mm/3.51")    See Detail Page for Pictures & Specs ea  85.952+  78.465+  66.9716+  58.44

DT-525  1-3/8" Drill Bit (35mm/1.38")    See Detail Page for Pictures & Specs ea  36.955+  32.8612+ 27.9738+ 23.44

IMPORTANT Diamond drill bits require the use of proper lubrication, correct drill speed and proper pressure.  Drilling methods and techniques vary significantly depending upon the material being drilled. Not for use on Concrete or with Hammer-Impact Drills, or for depths beyond about 1/2" Please See: Drilling Tips & Techniques

About National Material L.P. – National Material Limited Partnership and its affiliates have a long history of quality and service dating back to 1964. Since its founding, National Material L.P. has grown to over 30 business units and is now one of the largest suppliers of steel in America. The National Material group of industrial businesses consists of the Steel Group, Stainless and Alloys Group, Raw Material Trading Group, Aluminum Group, and Related Operations.

DT-560  5" Drill (125mm/4.9")    See Detail Page for Pictures & Specs ea 119.95 2+ 107.964+  90.2712+  78.34

Because of the time-sensitive conditions of the press-hardening process, robotics is usually employed for the material transfer between the furnace, die, and quenching stations.

Diamond Drill Bitsizes

IMPORTANT Diamond drill bits require the use of proper lubrication, correct drill speed and proper pressure.  Drilling methods and techniques vary significantly depending upon the material being drilled. Not for use on Concrete or with Hammer-Impact Drills, or for depths beyond about 1/2" Please See: Drilling Tips & Techniques

DT-526  1-1/2" Drill Bit (38.4mm/1.51")    See Detail Page for Pictures & Specs ea  39.954+  35.5610+ 30.3732+ 26.34

Press Hardened Steel or Hot Formed Steels undergo a unique manufacturing process where the steel is heated to a minimum temperature of 850*C then formed to a final shape in water cooled dies that control the rates of cooling / quench to insure desired properties are met. The high temperature combined with rapid cooling transforms the microstructure to nearly 100% Martensite and very high finished tensile strengths up to 2000 Mpa.  This process is commonly referred to as “Hot Stamping”. The finished product qualifies as advanced high-strength steel, and is three times as stable as the material was prior to undergoing the process. It’s strength-to-weight ratio is also vastly increased.

DiamondSure - Bonded Bits Recommended Drill Speed (rpm) Material         Bit Size -->  1/2" 1" 2" 3" 4"  Fiberglass 1200 700 350 250 175  Glass, Ceramic & China 800 500 250 160 125  Limestone & Marble Stone 600 450 225 130 100  Ceramic Wall Tile 600 450 225 130 100  Porcelain Wall Tile 500 375 180 125 90  Porcelain Floor Tile 500 375 180 125 90  Granite Stone 400 300 150 100 75 (Not for use on Concrete or for depths beyond about 1/2") SPEED KILLS:  Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.

DT-556  4-1/2" Diamond Bit (115mm/4.52")    See Detail Page for Pictures & Specs ea 109.95 2+ 99.964+  83.2713+  69.34

Old fashioned Spear Point carbide bits no longer workon the new type of super-hard floor, counter and wall tiles.Diamond Drill Bits are the solution.

DT-530  2" Diamond Hole Saw (51.1mm/2.01")    See Detail Page for Pictures & Specs ea  51.953+  46.268+  39.4725+  34.34

The implementation of press hardening applications and the utilization of hardened steels are promising alternatives for optimizing part geometries with complex shapes with no spring back issues. The Hot Forming process allows for the formation of shapes that cannot be cold stamped with Ultra High Strength steels.

DT-505  3/16" Drill (4.9mm/.19")    See Detail Page for Pictures & Specs ea  13.9510+ 12.2626+ 10.4780+   9.14

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DT-536  2-1/2" Bit (63.9mm/2.51")    See Detail Page for Pictures & Specs ea  59.953+  53.966+  46.1720+  40.24

The Press-Hardening / Hot Forming process was first put in to practice in the mid 1980’s and is primarily used in the creation of crash-sensitive safety components in automobiles. The parts created with this process meet several of the evolving requirements of the automobile industry, such as weight and cost reduction, as well as reduced environmental impact in its creation.

Diamond Drill & ToolOmaha, Nebraska Also See: Contact Information © Copyright Diamond Drill Bit & Tool 1998-2021.  All website content, images, pictures, graphics, design, wording and scripts, are the exclusive registered property of Diamond Drill Bit & Tool. See Copyright Information Site Index   |   Contact Us   |    Privacy.

Blunt Nose Diamond Tip Drill Bits work with any drill - just add water for lubrication.  Glastar brand drill bits are much easier and safer to use than old-fashioned spear point steel drills and don't chip the work material.  Blunt Nose Drills are primarily a Glass Drill Bit, for use on glass, stained glass, china plates or fiberglass.

Glass Drill Bit / Tile Drill Bit / Diamond Tip Drill Bit Measurements Shown Below are Outside Diameter (Click on individual drill bit pictures for detailed specifications) --- Item ---   Price   Qty / Order? 5/64"   1/8"   3/16"   1/4" DT-502  5/64" Diamond Bit (2.0mm/.08")    See Detail Page for Pictures & Specs ea  11.9512+ 10.5630+   8.9790+   7.74

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Go to top of PgReturn to Previous Section                   Solid Diamond Tip Drill Bit Electroplate Bonded Solid Diamond Tip Drill Bit For drilling glass, stained glass, china plates & fiberglass! Blunt Nose Diamond Tip Drill Bits work with any drill - just add water for lubrication.  Glastar brand drill bits are much easier and safer to use than old-fashioned spear point steel drills and don't chip the work material.  Blunt Nose Drills are primarily a Glass Drill Bit, for use on glass, stained glass, china plates or fiberglass. These solid point bits are not designed for as a Tile Drill Bit and should not be used for drilling porcelain tile, floor tile, limestone, slate, marble, granite or other stones.  Glastar Blunt Nose Drill Bits are designed to be used at high speeds up to 10,000 rpm. Since Glastar Diamond Tip Drill Bits have a solid rounded tip, they are slightly easier to start when drilling on a curved surface, such as a bottle, when compared to using a Core drill bit, above.  However, since solid tip drill bits drill out the complete hole, they also drill more slowly than the hollow core style bits and they are generally not used on the super hard abrasive materials such as ceramic tile, porcelain tile, floor tile, limestone, slate, marble, granite or other stones.  Hollow core style drill bits are recommended for drilling in these very hard materials and are available from 1/8" to 4" in the section, above.  See also How to Use Diamond Bits. --- Item --- Price Qty / Order?   TL-340  1/8" Solid Diamond Tipped DrillOut of Stock - Discontinued                        (Shaft size 1/8") 27.95

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DT-518  3/4" Drill Bit (19.3mm/.76")    See Detail Page for Pictures & Specs ea  24.957+  21.9616+ 18.7750+ 16.24

Diamond Drill Bits, are also know as a Diamond Tip Drill or Diamond Hole Saw.  They are often thought of as a Glass Drill Bit or Tile Drill Bit, but a Diamond Tip Drill Bit is much more versatile since they are used to drill glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, granite, light stone, and fiberglass.  Water is required for lubrication when drilling.

Not sure what type drill bit you need? Check out our Drill Bit Section Summary Page!

The unique properties of this material combine both complexity and strength – and components made with press-hardened steel can accomplish in one piece what would usually require heavier, thicker parts that are welded together.

PHS / HF Steels can be supplied with coatings that prevent the formation of oxide during the process. The most common of these coatings is Aluminum Silicon (AS) coating, other coatings may include Hot Dipped (GI), Galvannealed (GA) or Zinc Nickle (GP).

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These solid point bits are not designed for as a Tile Drill Bit and should not be used for drilling porcelain tile, floor tile, limestone, slate, marble, granite or other stones.  Glastar Blunt Nose Drill Bits are designed to be used at high speeds up to 10,000 rpm.

Diamondtipdrill bitfor metal

Material Drill Head Pressure *  Fiberglass 10 to 15 lbs.  Limestone & Marble Stone 12 to 18 lbs.  Glass, Ceramic & Porcelain China 12 to 18 lbs.  Ceramic or Porcelain Wall Tile 15 to 20 lbs.  Porcelain Floor Tile 18 to 30 lbs.  Granite Stone 18 to 30 lbs. * WARNING:  Drill press arm leverages hand pressure by a factor of about 6 to 8.  So 2 lbs. of hand pressure on the drill press arm will apply about 14 lbs of pressure to the drill head.

DT-507  1/4" Diamond Bit (6.5mm/.26")    See Detail Page for Pictures & Specs ea  14.9510+ 13.1624+ 11.2772+   9.74

DT-550  4" Diamond Hole Saw (102mm/4.02")    See Detail Page for Pictures & Specs ea  98.952+  89.965+  77.2715+  67.34

DT-540  3" Diamond Hole Saw (76.5mm/3.01")    See Detail Page for Pictures & Specs ea  74.952+  67.465+  57.7716+  50.34

DT-524  1-1/4" Drill (32mm/1.26")    See Detail Page for Pictures & Specs ea  33.955+  29.9612+ 25.4738+ 21.94

Diamond coated file is 7" long with "half-circle" shaft.  A perfect general purpose file for use on flat, rounded or curved edges.  Use on glass, stained glass, ceramic, marble, stone, fiberglass or plastic.  Blade of file is 3/8" wide, tapering to a point.  Perfect for filing off sharp edges, reshaping cuts or reaming drilled holes.  Handle is vinyl coated for safety and comfort.DF-151  7" Diamond 'Half-Circle' File ........... ea 12.95 / 3+ 11.63 / 8+ 9.29

DT-517  5/8" Drill (16.1mm/.63")    See Detail Page for Pictures & Specs ea  21.957+  19.3618+ 16.4755+ 14.24

DT-538  2-3/4" Drill Bit (70mm/2.76")    See Detail Page for Pictures & Specs ea  66.953+  60.266+  51.5720+  44.84

DT-565  5"-1/2 Diamond Bit (140mm/5.51")    See Detail Page for Pictures & Specs ea 129.95 2+ 119.96 4+  114.2712+  89.34

Since being introduced, Hot Forming has steadily increased in popularity.  Recent model year vehicles have seen the percentage of these steels rise to 25% of body in white weight.

DT-502  5/64" Diamond Bit (2.0mm/.08")    See Detail Page for Pictures & Specs ea  11.9512+ 10.5630+   8.9790+   7.74

DT-519  7/8" Drill (22mm/.87")    See Detail Page for Pictures & Specs ea  26.956+  23.7614+ 20.1745+ 17.54