The GN 990-AL Series of construction tubing for tube-clamp connectors come in inch sizes in round versions, and in metric sizes in both round and square versions. The products come in either untreated, plain finish aluminum, or clear anodized aluminum. The sawed end surfaces are untreated, but deburred. Also available are inch and metric-sized round and square tubings in zinc-plated, blue passivated steel, and metric-sized round and square tubings in untreated stainless steel. Tolerances for the outside diameter of the round construction tubings comply with the requirements for split monoblock connector clamps.
The tubings come in various diameters. Inch sizes come in 12, 36, 72, and 98.4-in.lengths. Additional lengths, in 1-in. increments up to 96 in., are also available. Metric sizes come in 300, 1,000, 2,000, and 3,000 mm.
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