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When a misaligned shaft or a worn pivot point causes slop in your linkage, the entire mechanism loses accuracy — a frustration familiar to CNC builders, robotics engineers, and industrial maintenance technicians. These rod end joint bearings give you a direct, thread-in solution that restores precise angular articulation without custom machining or adapters.
Each rod end consists of a forged steel shank with a rolled thread and a spherical plain bearing pressed into the eye. Available in bore diameters from 4 mm to 30 mm (approximately 5/32 in to 1-3/16 in) with matching metric thread pitches from M4×0.7 to M30×2. Both male (external, SA/SAL series) and female (internal, SI/SIL series) thread configurations are offered, in right-hand and left-hand versions for turnbuckle-style length adjustment.
Typical use cases include CNC router Z-axis anti-backlash linkages, robotic arm pivot joints requiring rod end bearings for 3-axis motion, and industrial push-pull control rods where a left-right thread pair enables in-line length tuning without disassembly.
| Product Type | Rod End Joint Bearing (Spherical Plain) |
|---|---|
| Series | SA/SAL (Male Thread), SI/SIL (Female Thread) |
| Bore Diameter Range | 4 mm – 30 mm (approx. 5/32 in – 1-3/16 in) |
| Thread Size Range | M4×0.7 – M30×2 (metric) |
| Thread Type | Male (External) / Female (Internal) |
| Thread Direction | Right-Hand / Left-Hand |
| Angular Misalignment | See variant options |
| Shank Material | Forged Steel |
| Bearing Insert | Spherical Plain Bearing |
| Finish / Coating | See variant options |
| Weight (per piece) | See variant options |
Choose male thread (SA/SAL) when you need to thread the rod end shank into a tapped hole in a bracket or clevis. Choose female thread (SI/SIL) when you want to thread a rod or stud into the rod end body. If you are building an adjustable-length tie rod, use one male and one female end on opposite ends of a threaded rod.
Right-hand thread tightens clockwise (standard). Left-hand thread tightens counter-clockwise. Pairing a right-hand rod end on one end of a threaded rod with a left-hand rod end on the other creates a turnbuckle effect — rotating the rod adjusts overall length without removing either end from its mount.
The spherical plain bearing insert accommodates angular misalignment in multiple planes, typically in the range of ±8° to ±12° depending on bore size and load. This self-aligning capability prevents binding when the connected components are not perfectly coaxial. For exact values, contact us to confirm.
Yes. The forged steel shank and thread-rolled pitch make these rod ends well-suited for CNC axis linkages, robotic arm joints, and servo push-pull rods where dimensional accuracy and fatigue resistance matter. Select the bore size that matches your shaft diameter and the thread size that matches your existing rod or housing.
Match the bore diameter (e.g., 8 mm) to the diameter of the pin or shaft that will pass through the bearing eye. Match the thread size (e.g., M8×1.25) to the thread on your rod or tapped hole. Both dimensions are listed together in the variant selector (e.g., "8 mm & M8×1.25") for easy selection.
The base material is forged steel. Surface finish and corrosion resistance vary by variant — contact us to confirm the specific coating or finish for your chosen size. For consistently wet or chemically exposed environments, consider adding a compatible grease or protective coating after installation.
The thread-rolled shank improves fatigue life compared to cut threads by inducing compressive residual stress at the thread roots. For high-cycle applications, ensure the rod end is correctly sized for the applied load, properly torqued, and inspected periodically for wear in the spherical bearing insert.
