Precision Rolling Pipe


  • Sanjack’s precision rolling pipe demonstrates extremely high precision and straightness can be less than 0.01mm/m. 
  • Series of cold rolling mill such as LG30, LG60, LG80, LG220 and establishes a complete QA & QC system. 
  • To ensure the rolling quality through pickling, phosphating and other processes. 

The precision rolling pipe can be used for downhole pump barrel & plunger, sucker rod coupling, ESP housing, motor bearing and housing. In 2015, Shengji established precision rolling pipe production line whose quality and accuracy are in the leading level in China. The annual production capacity can be more than 6000 tons. Excellent supplier for GE, SCHLUMBERGER, DOVER. 

Product Application 

Sanjack precision pipe with wide range of application for downhole pump barrel & plunger, sucker rod coupling, ESP housing, motor bearing and housing.  

  1. 1. Sucker Rod Pump

The precision rolling pipe is mainly applicable for the manufacture of pump barrel. In particular special materials such as brass, stainless steel, over-size (such as 120mm & above) large diameter pump barrel, using finished rolling process to meet the standard requirements. 

The precision rolling pump barrel parameters 

Barrel specification  Nominal Dia.      (in)  I.D.  Tolerance(mm)  Wall thickness  Material  Plunger specification  O.D. tolerance(mm)  Length (in) 
Φ32  1 1/4”  ±0.05  3/50” 







1.Carbon steel 1020、1026、1045 etc); 


3.Alloy steel 

304、316、316L、S50100、4130、13Cr、P9 etc. 

Φ32  ±0.05  4’-6’ 
Φ38  1 1/2”  ±0.05  Φ38  ±0.05 
Φ44  1 3/4”  ±0.05  Φ44  ±0.05 
Φ50  2”  ±0.05  Φ50  ±0.05 
Φ57  2 1/4”  ±0.05  Φ57  ±0.05 
Φ70  2 3/4”  ±0.10  Φ70  ±0.10 
Φ83  3 1/4”  ±0.10  Φ83  ±0.10 
Φ95  3 3/4”  ±0.10  Φ95  ±0.10 
Φ108  4 1/4”  ±0.10  Φ108  ±0.10 
Φ220  8 5/8”  ±0.10  Φ220  ±0.10 
Φ280  11”  ±0.10     


Brass Sucker Rod Pump 

To solve downhole sucker rod pump corrosion, Shengji researched & developed brass sucker rod pump using precise rolling after 2 year’s studying. Now, Shengji is the first manufacturer in China and the products have been successfully exported to America, Canada, Russia, Tunisia, Kazakhstan, Iran, etc. 


2.ESP Housing, Motor Bearing and Housing 

ESP housing and spline bearing made by Shengji with high dimensional accuracy, can be used directly without honing. 

Data Sheet 

Specification  Nominal Dia.  Tolerance  Wall Thickness  Material 
Φ139  5 1/2”  ±0.05mm  1/8” 



Alloy steel pipe 

16Mn,1Cr5Mo,35CrMo,9Cr1Mo,13Cr,22Cr, A335P9,4130,K500, 718 

Φ178  7”  ±0.05mm 
Φ210  8 1/2”  ±0.05mm 
Φ280  11”  ±0.05mm 




Data Sheet 

Dimension Range  280mm(OD)14mm(ID) 
Dimension Accuracy  ±0.05mm 
WT Tolerance  <0.35mm 
Flatness  0.8μm 
Straightness  <0.1mm/m 
Ovality  <0.03mm 

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