Precision Rolling Pump Barrel 

Heavy-wall, thin-wall, and heavy-wall with thin-wall thread configuration in Barrel types， as discussed below: 

Heavy-wall 

With wall tubing that measure between 0.393 and 0.472 inches. They are threaded externally, which allows the plunger to stroke out at both sides of the pump. This stroke-through construction created in the process prevents the formation of scale inside the pump barrel. Heavy-walled barrels are stronger and more rigid to ensure greater setting depth. Additionally, they come in two types; with a metal plunger (H) and a soft-packed plunger (P). 

Thin-wall 

With wall tubing measuring between 0.197 and 0.276 inches. They are threaded internally and have the most massive bore relative to any given tubing size. Accordingly, these pumps are suitable for moderate wellbore depth and come in two categories: a metal plunger (W) and a soft-pack plunger (S). 

Thick – wall and thin – wall pumps barrel are honed to complete the final process. But when the materials are special, such as stainless steel or brass, or the cylinder diameter is too large, the honing process cannot meet the accuracy requirements of the barrel. At this time, the Precision rolling process can only be used for the manufacture of the pump barrel.