Catnic Internal Solid Wall Steel Lintel - CN92 Benefits: Integral Plaster key: Lozenge shaped staggered holesto sides of corrugated profile Suitable for nominal domestic loading Product Applications: For 75mm Interior Solid Walls Standard Lengths (mm) 1050-1200 SWL (kN) 7 Weight (kg/m) 1.2 Nominal height\'h\' (mm) 25 Note: Standard lengths are available in 150mm increments. The SWL (safe working load) is based on the total UDL (uniform distributed load) over maximum span using 150mm end bearings. When using CN92 lintels normal building practice should be observed, in that one course of blockwork should be laid on the lintel and the mortar allowed to harden for at least 24 hours before additional loads are applied.