API 3/4" FS Class T coupling A. Type: T B. Material: carbon steel AISI5140 C. Basic hardness: hrc 16-23 D. Standard: API SPEC 11B E. Coupling diameter: 3/4 " F. Weight: 0.60 kg/pcs G. Package: wooden cases,500 pieces per box or 1000 pieces H. Port: tingdao/yantai/tianjin I. Payment terms: T/T . Wooden case.