Reyher has announced that it will be distributing the new CONU ‘fastener locking device’ designed for flat surfaces.
CONU was developed by Fürstenberg Fittings in Hamburg (patent pending) and will also be distributed by the Nord Lock Group. The counter nut is manufactured by HEWI G. Winker, a well-established automotive supplier and manufacturer of lock nuts and formed parts from Spaichingen in Baden-Württemberg.
Thanks to its self-locking effect, CONU does not require any additional safety and prevents ‘self-loosening’. Additionally, Due to its unique shape the counter nut fits into the countersink without any protrusion.
The key to CONU’s strength and versatility is its design. Due to the angle difference between nut and countersunk, plus due to the added serrations on the conical surface, the self-locking mechanism starts and then gets stronger the further the nut is pulled into the countersunk hole. This prevents the joints ‘self-loosening’. In addition, the joint can be tightened and locked without needing a spanner to hold the nut. In the Junker test (DIN 65151), the constant pre-load force was confirmed despite strong vibrations.
For the launch phase, CONU will be available in sizes M 6 to M 16 and in two different versions. This means that the counter nut can be used with grade 8.8 and 10.9 high tensile screws and bolts.