Complaint
Class T and Class SM coupling for sucker rods are manufactured as per API Specification 11B. For the thread cutting, we are using cold form rolled by displacing rather than by removing of material for making the coupling thread. The thread rolling cutting results in a compressive stress at the root of the thread, giving maximum strength to the traditional weak point of cut-thread couplings.
Class T coupling is using AISI 5140 to manufacture.The coupling is coated using phosphate chemical treatment or black oxide on customer's request.For Class SM coupling, the spray metal is a specification hardening process and is applied on the base metal.
The couplings are available in full size, slim hole and over size.Also, combination couplings are available for different diameters (sub-coupling) for both Class T and Class SM couplings.
We recommend changing sucker rod couplings after three make-ups, provided the connection threads have been inspected and deemed acceptable for reuse.
Dimension table :
OD | Coupling OD | Length | Wrench length | Wrench width | |
mm | in | (inch- mm) | (inch- mm) | mm | mm |
16 | 5/8 | 38.1(1.500) | 101.6(4.000) | 31.8 | 34.9 |
19 | 3/4 | 41.3(1.625) | 101.6(4.000) | 31.8 | 38.1 |
22 | 7/8 | 46.0(1.812) | 101.6(4.000) | 31.8 | 41.3 |
25 | 1 | 55.6(2.187) | 101.6(4.000) | 31.8 | 47.6 |
29 | 1 1/8 | 60.3(2.375) | 114.3(4.500) | 41.3 | 53.9 |
Chemical Properties, %: Class T Coupling | |
Steel | AISI 5140 |
C | 0.37~0.44 |
Si | 0.17~0.37 |
Mn | 0.50~0.80 |
P | ≤0.040 |
S | ≤0.040 |
Spray Metal Coating Chemical Properties, %: Class SM Coupling | |
Carbon | 0.50~1.00 |
Silicon | 3.50~5.50 |
Phosphorus | 0.00~0.02 |
Sulfur | 0.00~0.02 |
Chromium | 12.00~18.00 |
Boron | 2.50~4.50 |
Iron | 3.00~5.50 |
Cobalt | 0.00~0.10 |
Titanium | 0.00~0.05 |
Aluminum | 0.00~0.05 |
Zirconium | 0.00~0.05 |
Nickel | Balance |
1) How can I place an order?
A: You can contact us by email about your order details, or place an order online.
2) How can I pay you?
A: After you confirm our PI, we will request you to pay. T/T and Western Union are the most usual ways we are used.
3) What's the order procedure?
A: First we discuss order details and production details by email or TM. Then we issue you a PI for your confirmation. You will be requested to do a prepaid full payment or deposit before we go into production. After we get the deposit, we start to process the order. We usually need 15-25days if we don't have the items in stock. Before production has finished, we will contact you for shipment details, and the balance payment. After payment has been settled, we start to prepare the shipment for you.
4)How do you take care when your clients received defective products?
A: replacement. If there are some defective items, we usually credit them to our customer or replace them in the next shipment.
5)How do you check all the goods in the production line?
A: We have spot inspection and finished product inspection. We check the goods when they go into the next step production procedure.
