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When a fixed bearing simply won't do — when your linkage needs to pivot, articulate, and absorb misalignment without binding — engineers and makers reach for a rod end spherical plain bearing. These male thread eyelet rod ends are designed for builders working on CNC machines, robotics arms, steering tie rods, suspension linkages, and industrial control systems where angular movement and load transfer must coexist reliably.
Each rod end consists of a forged or machined steel shank with a male threaded stem and an integrated spherical ball-and-socket eye. The inner ball is typically steel with a PTFE-lined or chrome steel raceway, allowing multi-axis articulation. Available in both right-hand (SA-T/K) and left-hand (SAL-T/K) thread configurations, with inner diameter (ID) sizes ranging from 4 mm (~0.157 in) to 30 mm (~1.181 in) to suit a wide range of shaft and pin diameters.
Typical use cases include: CNC router Z-axis linkages requiring precise angular compensation; robotic joint assemblies where misalignment tolerance is critical; automotive and go-kart steering tie rod ends needing left/right thread pairs for toe adjustment; and agricultural or industrial actuator pivot points subject to combined radial and axial loads.
Spherical inner ball allows angular misalignment in multiple planes, preventing binding in dynamic linkage and pivot applications.
SA (right-hand) and SAL (left-hand) variants available in every size — pair them on a single rod for tool-free length adjustment.
Fourteen ID sizes from 4 mm to 30 mm cover the majority of metric linkage and actuator pin diameters used in CNC, robotics, and automotive builds.
Shank and eye housing are machined from carbon or alloy steel; surface treatment (typically zinc plating or black oxide) provides baseline corrosion protection for indoor and light outdoor use.
The spherical plain bearing design handles both radial and moderate axial loads simultaneously — suitable for steering, suspension, and actuator pivot points.
Male threaded shank installs directly into a tapped hole or threaded rod end — no special tooling required. Use a jam nut to lock position after adjustment.
| Product Type | Male Thread Eyelet Rod End Spherical Plain Bearing |
|---|---|
| Thread Type | Right-hand (SA) / Left-hand (SAL) — metric male thread |
| Inner Diameter (ID) Range | 4 mm – 30 mm (0.157 in – 1.181 in) |
| Thread Diameter | See variant options |
| Thread Pitch | See variant options |
| Outer Diameter (Eye OD) | See variant options |
| Body / Shank Material | Carbon steel or alloy steel (machined) |
| Ball Material | Chrome steel or carbon steel with PTFE liner |
| Surface Finish | Zinc plated or black oxide (corrosion-resistant coating) |
| Load Type | Radial + moderate axial (combined load) |
| Misalignment Angle | See variant options |
| Operating Temperature | Typically –30°C to +120°C (–22°F to +248°F) |
| Lubrication | PTFE-lined (maintenance-free) or grease-lubricated — See variant options |
| Weight | See variant options |
| Standards | DIN ISO 12240-4 (SA/SAL series) |
Match the inner diameter (ID) of the rod end to the diameter of the clevis pin, shaft, or bolt that will pass through the eye. For example, if your pivot pin is 10 mm in diameter, select the SA10T/K or SAL10T/K variant. Always verify the thread diameter and pitch of the shank against your tapped hole or threaded rod before ordering.
SA designates a standard right-hand thread — tightens clockwise. SAL designates a left-hand thread — tightens counter-clockwise. Pairing one SA and one SAL rod end on opposite ends of a threaded rod creates a turnbuckle-style assembly, allowing you to adjust the effective length by rotating the rod without removing either end.
The zinc plating or black oxide finish provides baseline corrosion resistance suitable for dry indoor use and light outdoor exposure. For prolonged outdoor, marine, or high-humidity environments, consider applying a compatible grease or corrosion inhibitor, or specify stainless steel rod ends for your application.
Yes. The spherical plain bearing design is rated for combined radial and moderate axial loads. However, they are not intended for pure thrust (axial-only) applications. For heavy axial loads, consult the load rating data for your specific size variant and ensure your safety factor is adequate.
PTFE-lined variants are maintenance-free under normal operating conditions. If your variant uses a chrome steel ball without a PTFE liner, periodic re-greasing through a grease nipple (if fitted) is recommended, especially in high-cycle or high-load applications. Check the variant specification for lubrication type.
These rod ends conform to the DIN ISO 12240-4 standard for SA/SAL series male thread spherical plain bearings. This is the most widely used metric rod end standard in European and international engineering applications, ensuring dimensional compatibility with standard metric hardware and mounting brackets.
Yes — rod end spherical plain bearings are a common choice for CNC Z-axis linkages, robotic arm joints, and servo-driven pivot assemblies. Their ability to accommodate angular misalignment reduces stress on shafts and frames, improving longevity and motion accuracy. Select the ID size that matches your pivot pin and verify the thread size fits your frame tapping.
