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Some of the most commonly used ¼-20 hardware is available in the following packages. Delrin® washer (0.63" OD x 0.25" ID x 0.05" T) can be used with ¼-20 screws to protect optical components.
Copyright 2020, Edmund Optics Inc., 101 East Gloucester Pike, Barrington, NJ 08007-1380 USA