... %, reduce down the labor force strength.Model AEC-500 high strength bolt testing machine has two functions, torsion shearing test and release ... . tension500NIndication relative error±1%Bolt diameterCommon type: M12, M16, M20, M22, M24, M27, M30Torsion shearing type: M16, M20, M22, M24Bolt length range40 ...