1)Type: FH SM coupling 2)New: Both-way Protection Globoidal Coupling Full size SM coupling with big chamfer 3)Material: High quality Carbon steel AISI 5I40 4)Coating:Spray Material Ni60A Alloy Coating 5)Basic Hardness: HRC 16-23 6)Surface Hardness: HRC 55-62 7)Hole rate: 2% 8)Min. Hardness of the layer: 595HV0.2 9)Standard: API Spec 11B 10)Coupling diameter: 5/8",3/4",7/8",1",1-1/8"11)Weight: 0.60 KG/pcs
