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Shelf-Pin Mount 1/2 in EMT Rod Cup
This rod cup lets you add a hanging rail to a wardrobe or cabinet without drilling. It pins into the shelf-pin holes the cabinet already has. A 18.4 mm U-cup takes 1/2 in EMT conduit (17.9 mm OD), and two 5 mm steel pins or dowels, each 16 mm long, go through the 6 mm plate into the side panel. The lower hole is round. The upper hole is a slot that fits hole spacings of 1 in, 1-1/4 in and 32 mm. There is also a 4.5 mm hole for a #6 screw if the cabinet has no shelf-pin holes. Print two and cut the EMT to the inside width of the cabinet minus 13 mm.
Shelf Pin Ledger Support Rail
A 160 mm ledger rail that plugs into five standard 5 mm shelf-pin holes on 32 mm System-32 pitch and spreads a sagging shelf's load along the whole cabinet side instead of four little pins. The 14 mm deep ledge carries the shelf, gussets under every pin put the load in the XY print plane, and M4 clearance holes let you screw through the web into the cabinet side (rescue for blown-out pin holes) or up into the shelf itself.