Classification of sucker rods
Ordinary sucker rod: C, D, K, KD grade sucker rod
High strength sucker rod: H grade, divided into HY, HL, KHL three types
Special sucker rod: hollow sucker rod: steel rod
Coiled sucker rod: steel rod
Special sucker rod for screw pump: Cone thread sucker rod, plug-in sucker rod
FRP sucker rod: fiber reinforced plastic sucker rod
Flexible sucker rod: carbon fiber composite sucker rod, steel wire rope sucker rod
Other types of sucker rods: electric heating sucker rods
