Height-Adjustable T-Shaped School Chair, Groups No. 4-7

This height-adjustable T-shaped school chair No. 4-7 is a student model for middle and senior classes. The seat height sets to four positions (380, 420, 460 and 500 mm), matching height groups No. 4-7 and covering pupils roughly 1450 mm tall and above. A single chair serves for several years and adjusts to a pupil's growth without replacement.

A distinctive feature of this model is its secure adjustment mechanism: the height is locked with a through screw-and-nut tie, while a cap nut is held inside the tube, so the fastening does not unscrew as the chair is rocked. The lower part of the frame has a round window on the pupil's side that shows the marking of the height groups — a facility manager or teacher can verify the setting without tools. The frame is welded from flat-oval tubes 30×15×1.2 mm, 38×20×1.2 mm and 50×30×1.2 mm with a powder coating; the seat (380×350 mm) and backrest (380×200 mm) are bent-glued plywood 8–9 mm with rounded corners. The tube ends have plastic caps.

The model suits middle- and senior-school classrooms where secure height locking and control of the correct setting matter. We help select a set in the required height groups, provide a manufacturer's warranty and deliver across Ukraine — convenient for facility managers and tender departments.

• Overall dimensions: 391x485x740-860 mm, seat height 380–500 mm
• Height groups: No. 4-7, height adjustment (380/420/460/500 mm)
• Weight: 5.3 kg
• Adjustment: screw-and-nut tie with a cap nut inside the tube, height-group marking in a frame window
• Frame: T-shaped, flat-oval tubes 30×15, 38×20, 50×30 mm, powder coating; seat and backrest — bent-glued plywood 8–9 mm
• Frame colour: light green (RAL6018), grey (RAL7035), yellow (RAL1018), graphite (RAL7024)

Why does the adjustment mechanism not loosen over time? The height is locked by a through screw-and-nut tie, and a cap nut is held inside the tube, so the joint does not turn as the chair is rocked — the fastening stays tight.

How can I check that the height is set correctly? The lower part of the frame on the pupil's side has a round window showing the height-group marking — a facility manager or teacher can verify the setting in seconds without tools.

What heights do groups No. 4-7 suit? A seat height of 380 to 500 mm is designed for pupils roughly 1450 mm tall and above — middle and senior classes; one chair "grows" with the pupil.