PIC Design offers Knurled Thumb Screws and Knurled Thumb Nuts in both inch and metric sizes. Knurled Thumb Screws have small ridges on the head allowing for a better grip and rapid assembly than would be provided by the originally smooth metal surface. Knurled Thumb Nuts have a round, knurled outside diameter which helps in tightening or loosening the nut without the use of a tool. Threads are offered in standard sizes from #4-40 to 1/4-20.
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