STL series adjustable student chair height group 4-6

Slides of the frame are made of channel U-shape with a wall thickness of metal 1,5 mm. The slide has the shape of an irregular trapezoid when viewed from the side, with a downward slope from the rear of the frame to the front. The height of the slide from the rear part of the frame is 53mm. The height of the skid from the front part is 35mm. The ends of the skids at the front and rear are sawed off at an angle of 45 degrees and welded. The lower part of the skid at the rear and front is welded at 50mm at the rear and 60mm at the front. The welded parts are fitted with 15mm diameter and 4.5mm high plastic feet. The bottom skid has decorative trapezoidal shaped cut-outs on the vertical sides. The middle part of the frame is made of round electric-welded pipe with a diameter of 28mm and 32mm and a wall thickness of 1.5mm. The horizontal lintel is made of round thin-walled electrically welded pipe 18mm in diameter, wall thickness 1.5mm. The upper part of the chair frame is made of a flat-oval tube with a cross-section size of 30x15mm, wall thickness of the tube 1,5mm.