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Pit Bull Logo

What is the Pit Bull™ Design?

The Melfred Borzall Engineers have developed a way to relieve your stress of breaking off a bit downhole. The Pit Bull Blades and Housing design utilize machined dowel pins that can be inserted by hand into the steer-face of the bolt-on housing. Those same dowel pins match up to holes on the directional blade being mated up. This simple feature adds over 100% shear load capacity to your blade bolts since they are no longer taking the force on rotation. This will not only make your bolts last longer, you never have to worry about them rattling loose, or backing out either.

FastBack® FastReam Housing

Bolts Rattling Loose & Backing Out

Bolt shearing is only one of the problems that happens when too much shear load is applied to the blade bolts. Another common problem is the bolts rattling as the blade rotates and pushes in uncommon ground situations. In this case, the bolts will eventually back themselves out instead of shear off, but the result is still a lost blade downhole, and likely tripping out and abandoning the shot.

Takes the load off of your bolts

When boring with a standard blade without the Pit Bull™ feature, there are many factors that can play into how long the blade bolts will hold up to the torque, speed and ground conditions of the job. With the integration of dowel pins that take the shear load from the bolts, they last longer and provide longer assurance that you will not leave a blade downhole.


Pit Bull Bark

Switch between Pit Bull™ tooling and your existing tooling

Do you love the Pit Bull™ concept but still have a half-dozen non-Pit Bull™ blades you need to use up? No problem. Since the Pit Bull housing's dowel pin are removable, you can use the Pit Bull™ housing with OEM parts and Pit Bull™ blades alike. Once ready, you can choose from any directional blade Melfred Borzall offers to fully take advantage of the Pit Bull features since every blade we offer comes in Pit Bull™compatible versions.