Summary: The Steel Flange with Post Insert for 1.5-inch OD Tubing (20-541/1H) is a carbon steel post base from Lavi Industries with a machined insert instead of a loose slip-fit. The 1.5-inch tube slides down over a 12-inch threaded steel insert that seats it square on a 3.5-inch flange. It is the Type B surface mount in the 500 series. The flange bolts down with four lag bolts and floor anchors, and a Flange Canopy 540/1H covers the plate; both are sold separately. It works with .050-inch wall tubing on indoor rails in offices, mezzanines, and stairs. Because it is carbon steel, paint or powder coat is needed before outdoor or damp use. A spec sheet is available, and it ships from US inventory.
Key specs: SKU=20-541/1H; Material=CARBON STEEL (NO material/finish field on PDP; 20- prefix + "Steel" product name confirms carbon steel; may require additional finishing for outdoor); Tubing OD=1.5"; Mechanism=Flange with Post Insert (tube SLIDES INTO precision-machined flange insert; distinct from welded + slip-fit mechanisms)
Steel Flange with Post Insert for 1.5-inch OD Tubing
This post base uses a machined insert rather than a loose slip-fit: the 1.5" OD tube slides into the engineered insert and seats precisely in the carbon steel flange. It is intended for indoor rails on .050" thin-wall tubing; add paint or powder coat if the installation moves outdoors or into damp conditions.