Flat caps for welding onto square tubing—provide a flat, smooth finish at the tube end. The cap is butt-welded onto the tube end and seals it securely against dirt and moisture. Available in sizes 30 × 30, 40 × 40, 50 × 50, and 60 × 60 mm, thickness 4.0 mm, raw Steel—optionally with a Ø 12.1 mm hole.