Square Tube Fittings
Square Tube Fitting are expander fitting that fit inside a square hollow tube. When the threaded stem is screwed in, the expander expands and is pressed firmly against the tube inner wall.To select the right expander fitting you need to know the inside diameter of your tube. For example, if the inside di...ameter is 22mm, simply select a round expander that expands from 21.5mm to 24mm. Read More
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