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SI TK Female Linkage Rod Ends
SI T/K rod ends provide a threaded socket and a pivoting bearing eye in one component. The internal thread connects to a male-threaded linkage, while the spherical joint accommodates the changing angle that occurs as the mechanism moves.
Description
Product Details
This page covers nineteen SI T/K designations. The range begins with SI5T/K and extends to SI35T/K, with separate "-1" versions listed for selected sizes.
The joint consists of a threaded housing and a spherical inner ring. A mounting pin passes through the ring, while the curved bearing surface lets the eye lean relative to the housing. That freedom of movement is useful in mechanisms where assembly tolerance, deflection or changing geometry causes the two connection points to move out of alignment.
The housing uses an internal thread. This is the main practical difference from an SA rod end, which has an externally threaded shank.
Product Description
An SI rod end can be fitted over the threaded end of a control rod or actuator shaft. Turning the housing changes the effective linkage length; once the required position is reached, the connection should be locked according to the machine design.
The spherical eye needs enough surrounding clearance to complete its working movement. If the connected part touches the housing before the mechanism reaches the end of its stroke, the resulting edge contact may interfere with movement and increase local stress.
These rod ends are suited to slow, repeated changes in angle, including those found in cylinder connections, adjustment links and automated mechanisms. They should not be selected for continuous shaft rotation. Bore diameter alone is also insufficient for replacement work-the thread, housing dimensions and complete suffix must match.
The page publishes T, K and selected "-1" designations without defining their dimensional differences. For that reason, the applicable drawing must be used when choosing or replacing a model.
Product Information
| Identification | Specification |
|---|---|
| Series | SI |
| Published Variants | T K and selected -1 versions |
| Connection to Linkage | Female internal thread |
| Bearing Form | Spherical sliding eye |
| Intended Movement | Repeated pivoting and limited angular displacement |
| Normal Load Orientation | Mainly radial |
| Listed Construction Metals | Carbon steel and bearing steel |
| Listed Surface Finishes | White zinc and hard chrome |
| Regular Designations | SI5T/K SI6T/K SI8T/K SI10T/K SI12T/K SI14T/K SI16T/K SI18T/K SI20T/K SI22T/K SI25T/K SI28T/K SI30T/K SI35T/K |
| Additional Designations | SI10T/K-1 SI12T/K-1 SI14T/K-1 SI16T/K-1 SI30T/K-1 |
| Replacement Rule | Match the complete designation and dimensional drawing |
| Details Required for Selection | Bore female thread thread direction housing clearance load and movement angle |
| Use Limitation | Not designed for uninterrupted high-speed rotation |

FAQ
1. Is the SI series male or female threaded?
The SI T/K products listed on this page have an internal female thread.
2. How is SI different from SA?
SI connects to an externally threaded rod through its female thread. SA has a male-threaded shank and connects to a female-threaded component.
3. Does the bearing eye rotate continuously?
It is designed mainly to pivot, tilt and oscillate at low speed. It should not be specified as a continuously rotating bearing.
4. Are models with the "-1" suffix interchangeable with standard models?
Interchangeability cannot be confirmed from the source page. Compare the drawings, thread dimensions and housing measurements before replacement.
5. What do the T and K suffixes mean?
The original page provides both designations without defining their construction differences. The complete model drawing is required for accurate selection.
6. What information is required for a quotation?
Provide the complete SI T/K model, bore, internal-thread specification, thread direction, quantity and operating requirements.
7. Are drawing-based orders available?
We build to customer drawings under OEM/ODM, and accept orders as small as a single piece for standard sizes.
About Us
Lishui Guangyuan Industry & Trade Co., Ltd. supplies rod ends, spherical plain bearings and linear-motion components for industrial equipment. Model drawings and installation information can be reviewed before production to confirm the bearing bore, internal thread and required operating angle.


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