3/4" full size spray metal coupling

Basic material: Steel alloy 40Cr (AISI 5140, HRA 56-62);
API SPEC 11B specification manufacture;
Inside diameter: 27.43mm(error bound: 0~+0.25mm);
Outside diameter: 41.3mm(error bound: -0.25~+0.13mm).
Casted alloy layer process on the surface has the function of wear-proof, corrosion-resisting and reducing the friction, protect both the coupling and the rods

3/4" full size spray metal coupling