Bearer thickness decides the screw length
The lower clamp is chosen for the bearer flange it has to grip. The screw then has to bridge the grating height plus that flange, so clamp and screw length are picked together — a clamp that fits the bearer with a screw that is too short leaves the fastening open.
What it pairs with
An upper clamp from clips, screw and nut from screws — or the whole combination pre-assembled as a fastener set.
Frequently asked questions
What is the function of a lower clamp?
It creates the connection between the bearer and the bearing bar of the grating. An upper clamp engages from above; screw and nut pull the two against each other.
Why is the contour of the lower clamp stepped?
The contour in the folded area secures at least one bearing bar. Thanks to the stepping, one lower clamp can cover several mesh sizes.
Are lower clamps suitable for through-mounting?
Yes, combined with the appropriate screw length they can also be mounted through the grating.
What else belongs to a lower clamp?
An upper clamp, a screw and a nut. These four parts make up the clamp fastening and are also available pre-assembled as a fastener set.