Master link with alloy steel, quenched and tempered. Individually proof tested to values shown with certification. Proof tested with 60% inside width special fixtures sized to prevent localized point loading per ASME A-952. Meets or exceeds all requirements of ASME B30.26 including identification, ductility, design factor, proof load and temperature requirements. Importantly, these links meet other critical performance requirements including fatigue life, impact properties and material traceability, not addressed by ASME B30.26.