MSO4™ self-clinching installation Smallest thread size: M1.0 / #0-80. Shortest length: 1 mm / .040″. Minimum sheet thickness: 0.3 mm / 0.012″. Maximum sheet hardness: HRB 88. Fastener material: Steel, Stainless steel, aluminum MSOFS™ flaring installation Smallest thread size: M1.0 / #0-80. Shortest length: 2 mm / .093″. Sheet thickness: 0.2 – 0.3 mm / 0.008 – 0.012″. Maximum sheet hardness: None, use any panel Fastener material: stainless steel. Parts for smaller and/or thinner applications have been designed.