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Drag Bits

Other than PDC bits, Drag Bits have the lowest cost per bit. Drag bits are a rotary drill bit built with a steel body and tungsten carbide teeth. These bits will out preform other more expensive bits if used appropriately. Drag bits are extremely popular choice for seismic drilling, blast hole drilling and geothermal drilling applications. For best results adjust the rotational speed to 50% less than what you would normally use for a tricone bit of the same size and reduce the weight on bit by the same amount.

Our Drag Bits Range in size from 3-5/8”(92mm) to 12 1/4″(311.2mm) with a 7 5/8″ API REG PIN

We Sell 3 Types of Drag Bits

Chevron Drill Bits
These are also known as fishtail type bits are a very aggressive, fast digging bit excellent for soft – medium soft formations. Reduce the drilling speed to slow and reduce the weight on the bit to less than half of what you would use when drilling with a tricone drill bit.
 

 

 

 

 

Gator Back Drill Bits
These are a durable drag bit capable of achieving excellent hole depth at exceptional speed. They are an excellent option if you are drilling seismic holes. You can maximize your rate of penetration and hole depth by reducing the rotational speed and the weight on bit by approximately 50% of what you would use on a tri cone bit. Gator back drill bits work well in very soft – medium formations. No lubrication is required as the ‘gator back has no bearings. Since there are no moving parts it is less likely junk will be left in the hole
 

 

 


Step Drill Bits
A Step Bit Drill Bit is an aggressive bit with 3 or more steps. The center step acts like a pilot bit and helps the drill bit to drill straighter holes. These drill bits are made to drill fast and straight in soft to medium soft formations. These drill bits have no moving parts and exceptional hole cleaning.
 

 

 

 

DRAG BIT PRODUCT LIST

Size (mm) Size (Inches) Thread Size Type
88.9 3.5 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
92.1 3.625 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
95.3 3.75 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
98.4 3.875 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
101.6 4 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
104.8 4.125 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
108.0 4.25 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
114.3 4.5 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
117.5 4.625 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
120.7 4.75 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
123.8 4.875 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
127.0 5 2-7/8 API REG Gaterback, Fishtail, Chevron, Step
130.2 5.125 2-7/8 API REG Gaterback, Fishtail, Chevron, Step
133.4 5.25 2-7/8 API REG Gaterback, Fishtail, Chevron, Step
139.7 5.5 2-7/8 API REG Gaterback, Fishtail, Chevron, Step
142.9 5.625 2-7/8 API REG Gaterback, Fishtail, Chevron, Step
146.1 5.75 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
149.2 5.875 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
152.4 6 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
155.6 6.125 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
158.8 6.25 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
165.1 6.5 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
171.5 6.75 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
200.0 7.875 4-1/2 API REG Gaterback, Fishtail, Chevron, Step
203.2 8 4-1/2 API REG Gaterback, Fishtail, Chevron, Step
215.9 8.5 4-1/2 API REG Gaterback, Fishtail, Chevron, Step
219.1 8.625 4-1/2 API REG Gaterback, Fishtail, Chevron, Step
222.3 8.75 4-1/2 API REG Gaterback, Fishtail, Chevron, Step
241.3 9.5 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
244.5 9.625 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
250.8 9.875 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
269.9 10.625 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
279.4 11 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
311.2 12.25 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
349.3 13.75 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
374.7 14.75 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
381.0 15 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
406.4 16 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
444.5 17.5 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
457.2 18 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
508.0 20 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
609.6 24 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
660.4 26 7-5/8 API REG Gaterback, Fishtail, Chevron, Step

Description

Other than PDC bits, Drag Bits have the lowest cost per bit. Drag bits are a rotary drill bit built with a steel body and tungsten carbide teeth. These bits will out preform other more expensive bits if used appropriately. Drag bits are extremely popular choice for seismic drilling, blast hole drilling and geothermal drilling applications. For best results adjust the rotational speed to 50% less than what you would normally use for a tricone bit of the same size and reduce the weight on bit by the same amount.

Our Drag Bits Range in size from 3-5/8”(92mm) to 12 1/4″(311.2mm) with a 7 5/8″ API REG PIN

We Sell 3 Types of Drag Bits

Chevron Drill Bits
These are also known as fishtail type bits are a very aggressive, fast digging bit excellent for soft – medium soft formations. Reduce the drilling speed to slow and reduce the weight on the bit to less than half of what you would use when drilling with a tricone drill bit.
 

 

 

 

 

Gator Back Drill Bits
These are a durable drag bit capable of achieving excellent hole depth at exceptional speed. They are an excellent option if you are drilling seismic holes. You can maximize your rate of penetration and hole depth by reducing the rotational speed and the weight on bit by approximately 50% of what you would use on a tri cone bit. Gator back drill bits work well in very soft – medium formations. No lubrication is required as the ‘gator back has no bearings. Since there are no moving parts it is less likely junk will be left in the hole
 

 

 


Step Drill Bits
A Step Bit Drill Bit is an aggressive bit with 3 or more steps. The center step acts like a pilot bit and helps the drill bit to drill straighter holes. These drill bits are made to drill fast and straight in soft to medium soft formations. These drill bits have no moving parts and exceptional hole cleaning.
 

 

 

 

DRAG BIT PRODUCT LIST

Size (mm) Size (Inches) Thread Size Type
88.9 3.5 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
92.1 3.625 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
95.3 3.75 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
98.4 3.875 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
101.6 4 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
104.8 4.125 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
108.0 4.25 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
114.3 4.5 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
117.5 4.625 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
120.7 4.75 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
123.8 4.875 2-3/8 API REG Gaterback, Fishtail, Chevron, Step
127.0 5 2-7/8 API REG Gaterback, Fishtail, Chevron, Step
130.2 5.125 2-7/8 API REG Gaterback, Fishtail, Chevron, Step
133.4 5.25 2-7/8 API REG Gaterback, Fishtail, Chevron, Step
139.7 5.5 2-7/8 API REG Gaterback, Fishtail, Chevron, Step
142.9 5.625 2-7/8 API REG Gaterback, Fishtail, Chevron, Step
146.1 5.75 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
149.2 5.875 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
152.4 6 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
155.6 6.125 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
158.8 6.25 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
165.1 6.5 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
171.5 6.75 3-1/2 API REG Gaterback, Fishtail, Chevron, Step
200.0 7.875 4-1/2 API REG Gaterback, Fishtail, Chevron, Step
203.2 8 4-1/2 API REG Gaterback, Fishtail, Chevron, Step
215.9 8.5 4-1/2 API REG Gaterback, Fishtail, Chevron, Step
219.1 8.625 4-1/2 API REG Gaterback, Fishtail, Chevron, Step
222.3 8.75 4-1/2 API REG Gaterback, Fishtail, Chevron, Step
241.3 9.5 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
244.5 9.625 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
250.8 9.875 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
269.9 10.625 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
279.4 11 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
311.2 12.25 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
349.3 13.75 6-5/8 API REG Gaterback, Fishtail, Chevron, Step
374.7 14.75 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
381.0 15 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
406.4 16 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
444.5 17.5 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
457.2 18 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
508.0 20 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
609.6 24 7-5/8 API REG Gaterback, Fishtail, Chevron, Step
660.4 26 7-5/8 API REG Gaterback, Fishtail, Chevron, Step

For more information and product availability, Contact Western Drilling Tools at 1.888.410.0826.

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