Levelling sets GN 350 are used for levelling and linking operations. They comprise a threaded upper sleeve and a female threaded lower sleeve. The fine thread allows a stepless and precise setting and locking using the C-Spanner DIN 1810. A locking ring serves also as a height limiter for the max. height.
Normally this screw is permanently and securely locked by the static load created when the mounting screw is tightened.
Should this not be sufficient, the use of a locknut (Type AK) is recommended.