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Sinker Bar

Sinker Bar (Grade C, K, D, HS)

Description
Sinker bar, a steel rod of a specified length, normally in a larger diameter than sucker rods, is provided in standard sizes with externally threaded ends offered to add weight and stability to the sucker rod string. An oil well uses only one sinker bar, and it is placed at the bottom of the sucker rod string. We offer carbon steel sinker bar, alloy steel sinker bar, etc.

Features
Generally, sinker bar has one elevator neck on one end, and pin threads on each end maybe sucker rod thread or polished rod thread, determined by the sucker rod string.

Advantages
We produce all grades of sinker bars in accordance with API Specification 11B. We use pit furnace to carry out heat treatment for larger diameter sinker bars to guarantee qualified mechanical properties and straightness of API sinker bars.

Parameter
Dimensions and Tolerances of Sinker Bars
Nominal Size 1-1/4 in. 1-3/8 in. 1-1/2 in. 1-5/8 in. 1-3/4 in.
in. mm in. mm in. mm in mm in. mm
With Sucker Rod Pin Threads
Sinker Bar Diameter Size 1.250 31.75 1.375 34.93 1.500 38.10 1.625 41.28 1.750 44.45
Tolerances +0.000
-0.030
+0.00
-0.76
+0.000
-0.030
+0.00
-0.76
+0.000
-0.030
+0.00
-0.76
+0.000
-0.030
+0.00
-0.76
+0.000
-0.030
+0.00
-0.76
Pin Shoulder to Wrench Flat Max. Size 0.750 19.05 0.750 19.05 0.750 19.05 0.750 19.05 0.750 19.05
of Wrench Flat (2 flats standard) Size 1.000 25.40 1.000 25.40 1.3125 33.34 1.3125 33.34 1.500 38.10
Tolerances ±0.03125 ±0.794 ±0.03125 ±0.794 ±0.03125 ±0.794 ±0.03125 ±0.794 ±0.03125 ±0.794
Elevator Neck Diameter Size 0.875 22.23 1.000 25.40 1.000 25.40 1.000 25.40 1.000 25.40
Tolerances +0.009
-0.018
+0.23
-0.46
+0.009
-0.018
+0.23
-0.46
+0.009
-0.018
+0.23
-0.46
+0.009
-0.018
+0.23
-0.46
+0.009
-0.018
+0.23
-0.46
Length of Sinker Bar Size 240 6,096 240 6,096 240 6,096 240 6,096 240 6,096
300 7,620 300 7,620 300 7,620 300 7,620 300 7,620
360 9,144 360 9,144 360 9,144 360 9,144 360 9,144
Tolerances ±2.000 ±50.80 ±2.000 ±50.80 ±2.000 ±50.80 ±2.000 ±50.80 ±2.000 ±50.80
Length of Wrench Flat Min. Length 1.250 31.75 1.250 31.75 1.250 31.75 1.250 31.75 1.250 31.75
Rod Pin Size (Nominal Size) 5/8 5/8 3/4 7/8 7/8
Length of Elevator Neck Min. Length 4.000 101.60 4.000 101.60 4.000 101.60 4.000 101.60 4.000 101.60
With Polished Rod Pin Threads
Rod Pin Size (Nominal Size) Size 3/4 3/4 7/8
1. Four wrench flats are available.
2. Customers can choose from elevator neck.
3. Length of sinker bars shall be measured from one outer end of pin to the other outer end of pin.
4. Minimum length excludes fillet.
5. Dimensions of sinker bars with polished rod threads are the same as those of sinker bars with sucker rod threads as shown above.