Providing marine products for more than 40 years

EPCO Products, Inc. Banner

Glossary

Ultra Sheen Polishing—is a hard polishing process of the stainless steel parts to a smooth, bright finish. The part takes on the appearance of a bright chrome or silver finish. This process provides the ultimate in quality appearance. The EPCO Ultra Sheen Polish bow eyes have passed the extreme conditions put upon them by a rigorous 336 hour salt spray test - the same test that electro polished bow eyes must pass. The cost to produce this finish is comparable to that of the electro polished bow eyes.

Cut Threading—process that cuts threads out of a round metal bar by special metal cutting dies. The dies are designed to cut the exact threads required. The diameter of the bar is the same as the resulting diameter of the high point of the threads being produced. Metal is removed from the bar, generating chips, necessitating die sharpening. This is a slower production operation than roll threading, thereby making it a more costly process than roll threading.

Natural Finish—the raw stainless steel stock that is received from the mill without any additional surface finishing being done. Surface finishing procedures may be done to the bars to make the surface smoother prior to the threading of the bars. The smoother the requested mill finish, the higher the cost of the bars. This material may have surface impurities that are a natural result of the mill production process. The amount of impurities would be relative to the surface finishing that had been done to the material. Surface impurities can be a source of future corrosion.

Roll Threading—process that provides threads on round metal bars by unique roll-thread dies. The process involves compressing and moving the metal of the bar in the area that is being threaded. The resulting threads are a reverse image of the dies. No metal is removed from the bar during this process. The threads produced cause the steel in the bar to expand to the height of the threads and compress to the depths of the threads. It is necessary to use a bar that is smaller in diameter than the resulting thread diameter to achieve the desired thread diameter, since the threads are created by the deformation of the bar to the larger thread diameter. Compared to cut threads, rolled threads can be produced from a smaller diameter bar; they waste no material to chips, are stronger, can be produced at a faster production rate and offer a better thread finish.