All of our Filter Subs are API Spec 7-1.

Planning for safety

From the design phase to the BHA application of all filter subs, we keep safety our first priority.

Light loads

All of our subs are built to 6 feet long for easy and safe handling on the rig floor. Other sizes available upon request

Mason Specialty Tools, LLC Downhole Filter Sub Rentals


Steel and Non-Mag Downhole Filter Sub Rentals/ Drill Pipe Screens

Oil Well Drilling Equipment

MST has taken filter subs to a whole new level by using a thicker material on both the body and the end cap of the filter. We have also added a tungsten carbide coating to the end cap to 5" below, thereby adding additional strength and durability to the filter.

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In the design phase, we conducted expert engineering and metallurgy studies and kept in mind the total flow area around and through the filter, which allows our customer to pump at maximum flow rates without the worry of erosion.


We offer filter subs in all sizes and connections as well as in non-magnetic and steel, giving you the ability to place in multiple locations in the BHA or above.  Research on flow simulated software plus extensive and continuing studies give us the ability to provide one of the best products in the drill string used for filtration today.


Smooth operator

We also designed a filter that can be placed in and taken out of the sub with ease.