Api Sucker Rod Coupling

API Class SM coupling 1)Type: SM FS and SH coupling 2)Coupling diameter: 5/8 ", 3/4", 7/8", 1", 1-1/8" 3) Weight: 0.41-1.29 KG/Pcs 4)Material: AISI 5I40 5)Spray Material：Ni60A Alloy Coating 6)SM Thickness：0.01-0.02in 7) Basic Hardness: HRC 16-23 8)Surface Hardness: HRC 55-62 9)Hole rate: 2% 10)Min. Hardness of the layer: 595HV0.2 11) Operating Temperature: -1000~400℃ 12) Life: > 180 days 13)Standard: API Spec 11B 14) Package: wooden case 15) Payment Terms: T/T Our New Products 1) SM Coupling with great bevel edge 2) Two-way Cambered Protection Coupling