casing head, API 6A standard Size: 9" --21 1/ 4" Working Pressure: 2000 psi---10000 psi Working Temp: -60° C---121° C Material: AA----FF RSL: 1---4 PR: 1---4 casing head, specifications: Standard: API 6A Size: 9" --21 1/ 4" Working Pressure: 2000 psi---10000 psi Working Temp: -60° C---121° C Material: AA----FF RSL: 1---4 PR: 1---4 casing head design features a 45 degree landing shoulder. This design avoids damage to sealing areas by drilling tools and prevents test plug and blow protector wedging problems when pressure is applied. This design also allows for accurate vertical positioning of annular seats, control line porting and test ports High quality and the soonest delivery can be assured. Welcome your inqury.