Core drills for hard materials

Here are our Diamond core drills for granite, hard porcelain and polymer concrete.
These long lasting barrels can used with your standard drill.
Although they are a little slower than electroplated hole saws, the pros prefer them for their long life.
See instructions for use at bottom of this page (also supplied with core bit).

  • Available 6mm to 180mm diameter
  • All drill bits have an internal length of 50mm
  • Longer lasting - ideal for regular users

Suitable for coring:

  • Granite, including bench tops
  • Hard porcelain, including tiles
  • Polymer concrete
  • Electrical and communications cable jointing pits

Fitting:
Up to 29mm, the barrels are fitted with a 12mm hex shank for use in standard drills
32mm and bigger have a 1/2" BSP female thread, and come with a 12mm hex shank adaptor, a pilot drill bit and a wedge key. For use with standard drills.

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Part Number Size  Price (each, incl GST)
CGS6-65 6mm $40
CGS8-65 8mm  $42
CGS6-65 10mm $48
CGS12-65 12mm $50
CGS16-65 16mm $60
CGS19-65 19mm $65
CGS22-65 22mm $75
CGS25-65 25mm  $76
CGS29-65 29mm  $85
CGS32-65 32mm $90
CGS35-65 35mm  $100
CGS38-65 38mm $110
CGS48-65 48mm $135
CGS51-65 51mm $140
CGS54-65 54mm $145
CGS57-65 57mm $155
CGS60-65 60mm $165
CGS64-65 64mm $175
CGS70-65 70mm $190
CGS75-65 75mm $200
CGS90-65 90mm $260
CGS95-65 95mm $270
CGS115-65 115mm $275
CGS117-65 117mm $280
CGS165-65 165mm $325
CGS180-65 180mm $375
Suction Ring Set 38mm & 75mm 
Water containment for wet drilling.
Push the ring down on a flat, smooth horizontal surface and fill with water.
$20 incl GST each - ex stock
de
Dymaxion diamond hole enlarger - 35mm diameter. 
Suitable for most building materials including porcelain and stone. 
Will also grind irregular shapes and rebates.
Used to enlarge an existing hole. 10mm hex shank, 25mm diamond coating.
Attach to drill and slowly rotate in anti clockwise direction, using firm pressure. 
HDEE35 $99 incl GST
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Instructions:

Use appropriate personal safety equipment - safety glasses, hearing protection etc

If using an electric drill, ensure you use an RCD to prevent electrocution. A battery drill is much safer with water than an electric one, and does generally have slower speeds..

DO NOT use on hammer (percussion) mode.

Even though a pilot drill is included, a simple template or guide will assist your drilling.

Use water to keep the diamonds cool. Or quench drill bit in water. An over heated barrel will cut slower.

Use only medium drilling pressure. The smaller the diameter, the less pressure is needed (otherwise you will damage the drill bit). Drilling is usually slow with these hard materials.

Start drilling slowly and gradually increase the speed, to the recommended speed as indicated below.

Withdraw bit regularly to allow cooling, allow water inside the hole and to clear debris.

Drill with slow speed, medium pressure and lots of water.

See our drill chart below as a guide for drill speeds.

Core bit diameter 12mm 25mm 50mm  75mm  90mm 
Fibreglass  1200rpm  700rpm  350rpm  250rpm  175rpm
Glass & china  800rpm  500rpm  250rpm 160rpm  125rpm
Pottery tile & marble 600rpm  450rpm   225rpm  130rpm  100rpm
Porcelain tile  500rpm 375rpm   180rpm  125rpm 90rpm 
Granite  400rpm  300rpm  150rpm  100rpm  75rpm

Tips for drilling polymer concrete (used in electrical, data and plumbing pits):

  • Pre drill pilot hole or use a template
  • Cool the diamond segments by regularly quenching in water
  • Avoid excessive drilling pressure
  • Wash down the barrel after use to stop slurry building up (dried slurry will slow coring on future holes)

Please see our "Contact Us" page (here) for Australia wide shipping information.

Prices correct as of 1/10/20 but subject to change.

Disclaimer: all the information on this website is provided in good faith and believed to be reliable and accurate at this time. However, the information is provided on the basis that the reader will be solely responsible for assessing the information and its veracity and usefulness. UDT shall in no way be liable, in negligence or howsoever, for any loss sustained or incurred by anyone relying on the information, even if such information is or turns out to be wrong, incomplete, out-of-date or misleading.

Dymaxion HDEM6 Sutton Bunnings
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-32.1112554,115.8192428

United Diamond Tools

Unit 10 / 84 Barberry Way
Bibra Lake
Perth
Western Australia 6163

Telephone: (08) 9434 6878
Mobile: 0419 901 533

Email:  sales@udt.com.au