Pipe couplings RK35 black

Inside every connector sits a molded in core of zinc plated steel. The core makes the joint considerably stiffer than a connector made entirely of plastic and lets it take up larger moments; that shows in tall racks, long unbroken tube lengths and structures that are moved often. On the outside the connector looks like its all plastic siblings, with the same matte surface and the same simple assembly.

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With three connections the connector ties together corners where two frame tubes meet a leg, one of the most common joints in tables, racks and carts. Four such corners plus four legs make a complete frame, and the same principle scales up to larger builds.

RK35 is a three way connector with a steel core for square tubes in nylon PA6. The series covers square tube 20x20 and 25x25 mm with a wall thickness of 1.5 mm, and you pick the dimension as a variant here on the product page. The connector is pressed into the tube ends and builds the structure together without welding; cut the tubes, put the connector in and tap the parts together with a rubber mallet.