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624 Bearing Shower Curtain Roller Hook
This C-frame curtain hook rides on a 624 bearing (4 x 13 x 5 mm) held on an M4 x 20 bolt and nylock nut. The curtain glides open on the bearing instead of scraping and squeaking on rings. It hooks on from the side, so you don't have to take the rod down, and it fits curtain and tension rods up to 32 mm (1-1/4 in) in a 34 x 37 mm window. Below the window is a slit eye for the curtain or liner. The hook measures 52 x 74 x 12 mm and prints flat, which puts the load in the layer plane.
Shower Door Top Roller Hanger
Replacement top hanger for framed sliding shower doors whose original roller cracked and whose OEM part is long discontinued — a 624 bearing (4 x 13 x 5 mm) becomes the wheel, clamped on an M4 x 20 screw through the 4.5 mm axle bore, so the outer race rolls on the existing track. The 64 x 24 x 5 mm plate carries two 4.6 x 11 mm slots giving 10 mm of height adjustment to re-square a dragging door, and the M4 screw head recesses 3 mm into the back so the plate sits flat against the door stile.