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Polydrive offers a line of standard precision rollers. This line, consisting of almost 100 part numbers, is made up of 3 roller configurations. Each configuration is offered in a variety of roller diameters, widths, and bore diameters. The standard Shore A hardnesses (Durometer) are 55 and 70. For small orders, we stock limited quantities of the metal cores to provide customers with quick deliveries and lower costs. Most of our standard rollers are used to test engineering concepts or are used to replace worn rollers in equipment where a close match can be made.
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Hubbed Rollers:
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Our standard hubbed drive rollers are manufactured using a precision 303 stainless steel core. The bores are sized to fit undersize (nominal minus) precision ground shafting. Depending on part number, these drive rollers are supplied with either one or two stainless steel set screws so they can be securely fastened to a shaft. The urethane diameters are ground to tolerance of +/- .003" and maximum concentricity, relative to the bore, of .001".
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Hubless Rollers:
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Our standard hubless drive rollers are manufactured using a precision 303 stainless steel core. They are typically used in applications where a hub drive roller is too wide. The bores are sized to fit undersize (nominal minus) precision ground shafting. The threaded holes are located on the centerline of the roller surface and go through the urethane coating. Depending on part number, these drive rollers are supplied with either one or two stainless steel set screws so they can be securely fastened to a shaft. The urethane diameters are ground to tolerance of +/- .003" and maximum concentricity, relative to the bore, of .001".
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Idler Rollers:
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Our standard idler rollers are manufactured using oil impregnated 841 sintered bronze sleeve bearings. They are designed for light duty applications with moderate to low speeds. The bearing bores are sized to fit undersize (nominal minus) precision ground shafting as well as some oversize (nominal plus) precision ground shafting. We bond the urethane directly to the sintered bronze which provides for a fairly low idler roller design. The urethane diameters are ground to tolerance of +/- .003" and maximum concentricity, relative to the bore, of .002".
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