The clamping bores of the flanged connector clamps GN 147.3 are not machined and specially designed for construction tubings GN 990 or DIN 2391, DIN 2395 and DIN 2462 respectively.
The square versions are also suitable for the attachment and/or use with profile systems.The standard clamping screws are socket cap screws DIN 912. They can be replaced by clamping kits GN 911 (article code see table of dimensions)