3-1/2 Inch DiamondSure Pro-Sintered Diamond Drill Bit

3-1/2" Pro-Sintered
Diamond Drill Bit DX-146

Available in Two Lengths
'Standard' or 'Long'

3-1/2 Inch Diamond Drill Bit

Designed for Heavy-Duty Drilling In

Porcelain Tile Brick Concrete Marble

Ceramic Tile Block Sandstone Granite

Masonry Cement Limestone Quartz

Heavy-Duty diamond drill bit. Diamonds are embedded in tip for long life and deeper drilling. The bit is available in two lengths - Standard or Long.

          Bit Style--> Standard Long

   Outside Diameter 3-1/2" 3-1/2"

   Total Bit length 3-1/2" 5"

   Max Drilling Depth 1-5/8" 3-1/8"

* Heavy-Duty Professional Quality.
* Long-life compared to Bonded Bits.
* Fits any 3/8" hand drill or drill press.
* Optional Pilot Bit available below.
* Use water for lubrication & cooling.

Do not use with hammer drill.
Consult usage instructions below.

More Details

Specifications

Instructions

Pilot Bit

Questions

Reviews

3-1/2" Standard Bit
$146.75 each

3-1/2" 'Long' Bit
$164.70 each

In Stock
Ready for Shipment
Standard Delivery
via Priority Mail
2-3 day delivery

Detailed Description

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Designed for Heavy-Duty Drilling In
Porcelain Tile Brick Concrete Marble

Ceramic Tile Block Sandstone Granite

Masonry Cement Limestone Quartz

Designed for materials to about 2" thick.
The "Long" Bit style can drill to about 3" thick.
Not recommended for glass.
Diamond Drill Bit Sizes from 1/8" to 5"

DiamondSure brand Pro-Sintered Diamond Drill Bits are also know as Sintered Diamond Core Drill Bits or Sintered Diamond Hole Saws. These are professional quality, heavy-duty diamond drill bits designed for use on ceramic tile, porcelain tile, limestone, sandstone, marble, granite, quartz and other stone, plus bricks, masonry, concrete block, and concrete. Water must be used for lubrication.

Sintered diamond drill bits are not very effective for glass type materials or softer stone materials such as slate and are not recommended for use on glass or slate. Bonded diamond bits are much more effective for those types of materials. See DiamondSure Bonded Diamond Drill Bits

Sintered diamond drill bits have the diamonds embedded into the metal of the drill bit tip rather than merely "bonded" to the tip as with bonded diamond drill bits. When drilling in very hard materials, the diamonds on a Bonded Diamond Drill Bit wear off and break off. When the diamonds are all gone, the drill bit stops drilling. However as the diamonds wear down on a Sintered Diamond Drill Bit, the tip also wears down and new diamonds come to the surface.

Sintered diamond drill bits are heavy-duty bits designed for long life. Generally, sintered bits will have a long life of 20 to 30 or more times the life of a bonded diamond drill bit, if used properly. The heavy-duty design provides long life when drilling in very hard materials such as porcelain tile, granite and hard stones.

There are a few disadvantages. Sintered bits are more expensive than bonded diamond drill bits and the thick heavy-duty tip causes them to drill more slowly than thin-wall bonded diamond drill bits. However, for highly repetitive drilling in hard mateirals, the higher cost of the Sintered Diamond Drill Bits is well worth it because of the much longer drill bit life. Sintered bits are also needed to drill beyond about 1/2" deep since the heavy-duty design can withstand the severe heat of deeper drilling in very hard materials.

Diamond drill bits are easy to use, but many drilling techniques are different from standard drilling. To assist our customers, basic Instructions are presented below and we have also compiled a detailed Drilling Tips & Techniques section.

Specifications

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Brand Name: DiamondSure

SKU / Model: Standard 900-051 Long 900-051L

Drill Bit Size: 3-1/2" OSD

Max Drilling Depth: Standard 1-5/8" Long 3-1/8"

Specs:

.
Pro
Sintered
Long
Pro
Sintered

Fractional Size:
3-1/2"
same

Tip Style:
Hollow
same

OSD - Metric:
89mm
same

OSD - US:
3.5"
same

ISD - Metric:
82.7mm
same

ISD - US:
3.25"
same

Shaft Diameter:
10mm
same

Sidewall Thickness:
3mm
same

Shaft Length:
1"
same

Bell Inside Depth:
1-3/4"
3-1/4"

Total Bit Length
3-1/2"
5"

Optional Pilot Bit:
Yes
Yes

Other: Drill bit requires water for lubrication and cooling.

Raise the drill bit up slightly every 30-40 sec,
to allow water to penetrate to the drilling tip.

Proper drilling speed, pressure and lubrication are necessary to keep the bit from over heating when drilling in very hard materials.

Do not use with a hammer impact drill.

Instructions

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Pro-Sintered Drill Bits - Water Lubrication

Water must be used for lubrication. There are many ways to lubricate the drilling, as explained in our Drilling Tips & Techniques page.

It is important to "pump" the drill every 30-40 seconds, to allow water to seep to the drilling tip area. Merely raise the drill bit slightly to allow water to flow to the tip and keep the tip from running dry. This simple technique helps keep the drill bit from overheating, extends the bit life considerably and helps avoid causing "heat fractures" in the work material.

Simple lubrication methods include drilling under water in a cake pan or tub, using a small clay "dam" around the drill hole area or even using a spray bottle to spray water directly into the drill slot. These simple lubrication methods are very effective when used properly and they work well for most drilling applications.

Another effective lubrication method and the one used by many professionals, is to use a Water Swivel, also know as a Water Feed System.

All DiamondSure Pro-Sintered Drill Bits have a shaft size of 10mm. Our Water Swivel section includes the DX-902 Swivel with a 10mm Collet, designed for use with drill bits that have 10mm shafts, such as the DiamondSure Pro-Sintered bits. See: Water Swivel Devices

IMPORTANT
Diamond drill bits require use of proper lubrication,
correct drill speed and proper pressure.
Drilling methods and techniques can vary significantly
depending upon the specific material being drilled.
Please See: Drilling Tips & Techniques

Starting a Hole Saw / Core Drill and
Using A Center Pilot Starter Bit

Starting a hollow core drill / hole saw style drill bit can sometimes be difficult. Our Drilling Tips & Techniques section discusses the various starting methods.

Method 1: To start drilling, you can usually hold the tip in place with your fingers while running the drill at a very slow speed. Once the bit has created a slight 'groove', the drill bit will remain stationary on it's own.

Method 2: For smaller drill bits, you can also hold the drill at a 60 degree angle while running the drill at a very slow speed. As the drill bit begins to drill, slowly tilt the drill bit up to vertical. Once the bit has created a slight 'groove', the bit will remain is position.

Method 3: A simple template can be made by drilling a pilot hole, the size of the diamond drill bit, in a piece of soft wood or plastic. Hold the template in place over your drilling area and use the 'pilot hole' to hold the drill bit in place when beginning to drill. You can also use a "V" on the edge of a starting template to help hold many sizes of core drill bits.

Starting Diamond Drill in Tile

Method 4: The Pro-Sintered Drill Bits for sizes 1-1/4" and above are also designed to accept a Center Pilot Bit. An optional Pilot Bit is available below. However, we do not recommend using a Pilot Bit in extremely hard materials, for the reasons discussed below. Starting Methods 1 - 3 above are very effective and do not interfere with the performance of the diamond drill bit.

Recommended Speed / Pressure

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It is very important to use proper drilling techniques to keep a diamond drill bit from over heating and to avoid causing "heat fractures" in the material being drilled. Proper drill speed, low pressure and good water lubrication are very important factors.

DiamondSure
Pro-Sintered Diamond Drill Bits
Recommended Drill Speeds

DiamondSure Sintered Bits	Recommended Drill Speed (rpm)
Material Bit Size -->	1/2"	1"	2"	3"	4"
Glass & Fiberglass	Not Recommended
Slate or soft stone	Not Recommended
Limestone & Marble Stone	1600	800	400	300	200
Concrete & Masonry	1600	800	400	300	200
Ceramic Wall Tile	1600	800	400	300	200
Porcelain Wall Tile	1200	600	300	225	150
Porcelain Floor Tile	1200	600	300	225	150
Granite Stone	1200	600	300	225	150

Designed for long-term use in materials up to 1-3/4" thick
(Not for use with Hammer Drills)

DiamondSure
Pro-Sintered Diamond Drill Bits
Recommended Drill Head Pressure

Material	Drill Head Pressure - Lbs*
Material Bit Size -->	to 1/2"	1/2"-1"	1"- 2"	2"- 3"	3"- 4"
Glass & Fiberglass	Not Recommended
Slate or soft stone	Not Recommended
Limestone & Marble	12 -18	18 -26	24 -36	32 -50	45 -60
Porcelain Wall Tile	15 -24	20 -30	30 -45	40 -60	50 -75
Porcelain Floor Tile	20 -30	30 -45	40 -60	50 -75	60 -95
Granite & Quartz	20 -30	30 -45	40 -60	50 -75	60 -95

WARNING:

Drill press arm gears leverage hand pressure by a factor of about 6 to 8. So 2 lbs of hand pressure on the drill press arm can apply up to 16 lbs of pressure to the drill head.

Optional Pilot Bit
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Using A Center Pilot Starter Bit

Starting a hollow core drill / hole saw style drill bit can sometimes be difficult. Various starting methods are discussed the instructions section above.

The Pro-Sintered Drill Bits of 1-1/4" and above are designed to accept a Center Pilot Bit. An optional Pilot Bit is available below. However, we do not recommend using a Pilot Bit in hard materials because of the reasons discussed below.

Diamond drill bit with pilot bit
Diamond Drill Bit with
optional pilot bit.
If a Center Pilot Bit is used to start the drill bit, it is important to remove the pilot bit as soon as possible after the diamond drill bit has started drilling.

The carbide pilot bits cause the diamond bit to drill very slowly so the Pilot Bit should be removed when no longer needed.

Also, the carbide pilot bit will wear out quickly when drilling in very hard materials, so it should not be used any longer than necessary.

Optional Center Pilot Bit
for Pro-Sintered Diamond Drill Bits

Center pilot bit
(available in two lengths)

Price Qty Order?

DX-199 Pilot Bit - Standard
2.75

DX-299 Pilot Bit - Long
3.50

Diamond Drill & Tool
Omaha, Nebraska

Also See: Contact Information

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