This is an aluminum mounting hub designed to locking stationary shafts to the frames.
The bore diameter is designed for 1/4" shafts or 6.35mm shafts. To keep the shaft locked into place, this product comes with an 3/32" Hex set screw and four 4-40 philips head screws for fastening to the frame.
This product is specificed for imperial measurements, if you want our metric equivalent check out 1083-POLOLU.
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