Hexagon lock nuts for bulkhead fittings from the FI-SKM series secure the position of bulkhead fittings in a bulkhead wall. Available in the Light and Heavy Series as per ISO 8434-1 / DIN 2353. Covers all common thread sizes from M 12 x 1.5 to M 52 x 2. Accessories and spare parts for tube connectors and cutting ring fittings from the STAUFF Connect series made of steel with 24° internal taper. For hydraulics.