The POS and PHS Rod End Bearings are standard, commonly available series of spherical rod ends designed for basic, high-load linkages in mechanical systems. They are defined by their structural design, mounting type, and the simplicity of their operation.
Here is a breakdown of their functional features:
Shared Functional Features (Applicable to Both POS and PHS)
Both the POS and PHS series share the core functionalities of a standard rod end:
1.High Load Capacity: Both are built with robust, generally non-self-aligning spherical balls and heavy-duty steel housings, allowing them to transmit significant Tension (pulling) and Compression (pushing) forces along the axis.
2.Angular Misalignment: Both accommodate angular misalignment (tilting) between connected parts. This allows for smooth operation even if the driving and driven components are not perfectly in-line, preventing harmful bending moments on rods and pins.
3.Low-Friction Operation: Both often feature a PTFE composite liner (Teflon) or similar low-friction material separating the steel ball from the housing's race.
- Function: This provides a smooth bearing surface, reduces the coefficient of friction, and, critically, makes them maintenance-free/self-lubricating-meaning they do not require regular re-greasing.
4.Oscillatory Movement: Both are designed to handle back-and-forth rocking and rotation common in cyclical lever and linkage mechanisms.
Summary of Choice
The choice between the POS and PHS series is determined by the mating component in the linkage:
Choose POS (Male Thread): If the component it connects to has a female (tapped) thread.
Choose PHS (Female Thread): If the component it connects to has a male (external) thread.