Sunrise Petro owns a strong ability about research, design and production of sinker bar with decades of manufacturing experience. Sunrise Petro has been certified by ISO9001, API Q1, ISO14001 and OHSAS18001.Sunrise Petro adopts the principle of combining API standards, national standards and users views for design.
Sinker bars of Sunrise Petro are exported to the United States, Canada, Europe, Africa and Middle East, and we establish cooperative relationships with international customers all over the world.
Sinker Bar is heavier than the conventional rod. It is used at the bottom of the sucker rod string to keep the rod string under tension and reduce crooks of the sucker rod string during downward travel. Sinker bars provide concentrated weight above the pump to help keep the rod string straight and in tension, which reduces buckling of the sucker rods or the pump plunger. Sinker bars are made of hot rolled carbon manganese steel bar. Sinker bars are surface turned and have API double sucker rod pins, shoulders, and wrench flats on both ends. One end has a reduced section for elevator seating and lifting.
Grade and material
The current edition of API Specification 11B recognizes two grades of sinker bars, Grade 1 Carbon steel and Grade 2 Alloy steel.
Below are the material examples.
In general, API Grade 1 is referred to as Grade C while API Grade 2 is referred to as Grade K depending on material alloy type.
The following is the data sheet of common sizes and mechanical properties of sinker bar.
| External diameter (mm) | External thread | Wrench square | Wrench square | Sinker bar | Mechanical |
| 1 1/4(31.75) | 5/8(15.9)SR | 25.4 | 31.8 | 7600;9100 | 1. Class-1: |
| 1 1/4(31.75) | 3/4(19.1)PR | 25.4 | 31.8 | 7600;9100 | |
| 1 3/8(34.93) | 5/8(15.9)SR | 25.4 | 31.8 | 7600;9100 | |
| 1 3/8(34.93) | 3/4(19.1)PR | 25.4 | 31.8 | 7600;9100 | |
| 1 1/2(38.1) | 3/4(19.1)SR | 33.3 | 38.1 | 7600;9100 | 2. Class-2: |
| 1 5/8(41.28) | 7/8(22.2)SR | 33.3 | 38.1 | 7600;9100 | |
| 1 3/4(44.45) | 7/8(22.2)SR | 38.1 | 41.3 | 7600;9100 |
Sinker bar also have C,D,K strength grades as sucker rods
Sunrise Petro can supply API Sucker rod including the common sucker rod& pony rod, polished rod and sinker bar. Based on API Spec 11B and SY / T 5029 specifications, Sunrise Petro also developed a series of special sucker rods suitable for different well conditions, especially under high corrosion and high load conditions for oil well.
Our technical staff is ready to provide assistance in selection and design.With inventory and field sales support in strategic location, we are ready to respond in a timely professional manner 24 hours a day.
