I have an O-shaped aluminum (7075) profile WxDxH - 40mm x 200mm x 25mm The inner channel is 20 mm wide and 10 mm deep - runs through the entire length of the bar.
Inside, I have a 20 mm x 10 mm bar (also Al 7075). As you can see from the attached picture, on the opposite face there's a hole in which a flat screw is used to fasten the two pieces in position.
This telescopic mechanism needs to withstand large loads >50 kg (>110 lbs) on both ends and I'm worried that using only a screw would mean that there will be slippage.
Is there a better way to design a secure clamp for such a telescoping mechanism? I need to be able to do fine positioning and have the confidence that it won't move.
Thanks in advance for your help.