Made to Order Buttress Thread and Other Hybrid Forms

The buttress thread form is typically used fastener applications where high axial stresses are involved. The buttress thread has two different thread flank angles. When following ANSI B1.9-1973 as a guide the load carrying flank angle is 7° and the clearance flank is 45°. Although these flank angles represent the conventional approach the buttress is probably the most deviated from of all the thread design profiles. The reason for this is that getting the load flank as close to 0° yields greater stress performance.

On occasion the buttress thread profile or derivative thereof is used in Power Transmission and Linear Motion applications. The only way that a buttress thread can be used in power screw is when the load force is unidirectional. Probably the best application example of this would be a mechanical jack where a load is being either raised or lowered. Whatever the direction of movement the load is always in axial compression or tension depending on the placement of the jack. Buttress type power screws can not be subjected to push/pull load forces only push/push or pull/pull.

If you feel that a custom Power Transmission or Linear Motion is might be right for you application please present your requirements to PST. We will help you come up with the best combination for your system.

As with most of the custom Power Transmission and Linear Motion power screws there is a very large variety of materials that can be used in their manufacture. See the PST Material sheet for more information.