API 8-1/8'' Oil Well Screw Stop Ring

API 5CT or 10D stop collar manufactured by Puyang Zhongshi Group  Product Description The Hinged Spiral Nail Stop Collar comprises of two parts and hinged at two ends making an angle of 180 degree.  This hinged Stop Collar has an internal groove and these are available in 4 1/2 " to 20 " sizes, any sizes in which a spiral locking pin is inserted.  This tightens the collar to the casing firmly. It can be latched on the casing pipe without having to be slipped on.  This cementing product is easy to install and most effective where annual low clearance received.  The stop collars are coated with to polyester powder which prevents it from getting rust. Subsurface Sucker Rod Pump, Cementing Accessories, Pressure Vessels, Sucker Rod Pump, Pumping Unit, Valve Seat Specification,in 13 3/8″ 10 3/4″…