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This is a 3/4-inch bore linear ball bearing unit, also known as a pillow block. The model numbers are SSWD12UU or TWD12UU, and it's from SpinCo Bearing. The 'open style' design means it has a slot on top, which allows you to install it onto a supported rail or shaft without having to slide it all the way from the end – super handy for assembly and maintenance. These are essential components in 3D printers, CNC machines, sliding doors, and any project that needs smooth, precise linear motion. It's brand new in its packaging. Just make sure it matches the diameter of your linear rail or shaft (3/4 inch, or 12mm). A quality industrial part for makers and engineers.
4.6 out of 5