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Polished Rod

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Function of Polish Rod

Polish rod is a kind of special sucker rod connected with sucker rod and beam hanger. It is at the top of sucker rod, need to bear the most strength,so with bigger diameter and higher steel grade than sucker rod, and the surface is very smooth.

Main function:

  1. Combined with packing set in packing box to seal wellhead and prevent oil、gas、water disclosure.

  2. Interim connector between sucker rod and mule head hanger.

  3. Finishing indicator diagram test.

  4. Complete various wellhead operation, such as pump striking, regulating pump setting.

Type specification table:

Nominal valueRod body diameter   D
+0.127-0.254(+0.005-0.010)
mm(in)
Length  Lmm士 50mm  (Lft 士 2in)Thread  nominal diameter   mm(in)mm    (in) Outer thread  shoulder outer diameterSuitable sucker rod size   mm (in)
2928. 6 (11/8)2438, 3353, 4877, 6707, 7315, 7925
(8, 11. 16. 22. 24 , 26)
24 (15/16) PR16 (5/8)
27 (1 1/16) PR19 (3/4)
2928. 6 (11/8)rod-upset on one end2438, 3353, 4877, 6707 , 7315, 7925                                                 (8. 11, 16. 22 , 24 , 26)24 (15/16 ) SR31.8+0.127-0.254        (1.250+0.005-0.010)16 (5/8)
27 (1 1/16 ) SR38.1+0.127-0.254        (1.500+0.005-0.010)19 (3/4)
3231.8(1 1/4)3353, 4877, ,6707,7315, 7925 , 9144, 10973
(11, 16, 22 . 24.  26, 30. 36)
30 (1 3/16 ) PR22(7/8)
3231.8(1 1/4)rod-upset on one end3353, 4877, ,6707,7315, 7925 , 9144, 10973
(11, 16, 22 . 24.  26, 30. 36)
30 (1 3/16 ) SR41.3+0.127-0.254        (1.625+0.005-0.010)22(7/8)
3838. 1 (1 1/2)4877, 6707,7315, 7925. 9144. 10973
(16, 22. 24,  26, 30. 36)
35(1 3/8)PR25(1)
3838. 1 (1 1/2)rod-upset on one end4877, 6707,7315, 7925. 9144. 10973
(16, 22. 24,  26, 30. 36)
40(1 9/16)SR57.2+0.381-0.381 (2.250+0.015-0.015)29(1 1/8)

Mechanical Property OF Steel Polished Rod:

Mechanical Property OF Steel Polished Rod
GRADEMinimum Yield Strength(0.2% Residual Deformation)Minimum Tensile StrengthMaxmum Tensile StrengthElongation200mm%Reduction of Area Z%HRCHBFatigue Life

psiMPapsiMPapsiMPa≥13≥50

≥1.0X106
C6000041490000621115000793≥13≥50


D85000586115000793140000965≥13≥50


KD85000590115000795140000965≥13≥50


H1150007951400009651733391195≥13≥45


EHL//18850013002175001500//≥50≥320≥2.5X106
Note: When the minimum yield strength cannot be measured, it should be considered to be processed into standard sample and install  extensometer to measure.
a It is generally made of high quality carbon steel, which can reach the mechanical properties of the table
             b A molybdenum steel (but not limited to this type of steel) is generally used, and the effective heat treatment can achieve the mechanical properties of this table

Chemical Composition OF Commonly Used Sucker Rod:

Chemical Composition OF Commonly Used Sucker Rod
AISICSiMnPSCrNiMoVCuAl
41300.26-0.330.17-0.370.4-0.7≤0.025≤0.0250.8-1.1≤0.30.15-0.25/≤0.2/
41400.38-0.450.17-0.370.5-0.8≤0.025≤0.0250.9-1.2≤0.30.15-0.250.04-0.09≤0.2/
41420.38-0.450.17-0.370.5-0.8≤0.025≤0.0250.9-1.2≤0.30.15-0.250.04-0.09≤0.2/
43300.3-0.350.15-0.350.8-1.1≤0.025≤0.0250.8-1.11.65-2.00.2-0.30.05-0.10≤0.2/
47200.19-0.230.15-0.350.85-1.05≤0.025≤0.0250.8-1.050.9-1.20.22-0.300.02-0.050.40-0.60

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Polished Rod

Polished Rod


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