Welcome to R. Dray Mfg. - The Pioneers of DesignTechnique, and Service

We are the experts of design, manufacturing, and rebuilding of feed screws and non-return valves for the plastic extrusion and injection molding industry. We specialize in helping molders and plastics processors increase output and overall quality while decreasing cycle time; maximizing productivity, efficiency, and ultimately increasing your bottom line. Since patenting the first and most widely used basic barrier screw design in the United States in 1972 (Patent # 3,650,652), we have been the leaders of industry advancing patent technology. 

If you have a production goal in mind, R. Dray Mfg. can evaluate your process, design and manufacture the most cost effective solutions to meet your needs.

R. Dray Mfg. was the first to guarantee performance in the Plastics Industry. Other companies may claim to be the performance leader in design technology, we go a step further - we guarantee that our designs will out perform all others - and have guaranteed this for over forty years!


If your customers deserve the best qualityprice, and consistency in your products then you need the most advanced screws and non-return valves in the industry!

We are the screw designers.

We engineer screws and valves guaranteed to increase performance


With almost 200 combined years of proven manufacturing and engineering expertise, R. Dray Mfg. develops innovative solutions that re-define the standards of efficiency in the plastics manufacturing industry. Our patented screws and non-return valves will increase production efficiency, quality, and profitability, guaranteed. We can outfit your entire plasticating unit to maximize production potential, and to save you money we offer the most effective screw rebuilding and repair program in the industry. Learn more about how we can help your company become more profitable today.


Why is R. Dray Mfg. the industry leader in technology?

Watch our latest video to learn more!


Our designs will outperform any competitor's designs

We offer a no risk Unconditional Guarantee. If you aren't satisfied with the performance of our product, return it for full credit!

Why us?

Find out about our innovative designs, our cost saving solutions, and the results of our decades of experience.

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Take Action

Ready to take your productivity to the next level? Let us begin process evaluation and help you save. 

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