Types of Rod Ends
Rod end manufacturers can produce a number of rod end bearing styles. They include:
- Internal thread (female)
- External thread (male)
- Self-lubricating/Metal-to Polymer
- Metal-to-metal with grease fitting
- Extended inner ring
- Ball joint rod ends
Rod End Super Finishes
Corrosion resistance is vital to rod ends as they work in exposed areas under rough environmental conditions. Your rod end bearing manufacturer may offer the zinc finish to prevent rust.
Rod End FAQs
What is the purpose of a rod end bearing?
A rod end is an articulating joint that is usually found where misalignment occurs. For example, they are used in tie rods, steering links and control rods. A rod end provides precise control with point-to-point contact from the rotation’s center on the axis of attached shafts.
How do self-lubricating rod ends differ from metal-to-metal rod ends?
Self-lubricating – or metal-to-polymer – rod ends do not require maintenance. They are formulated with lubricants that last the life of the bearing and may take the form of a bushing, nylon or PTFE. Metal-to-metal rod ends require periodic regreasing, so the rod ends are manufactured with a zerk.
What is a zerk?
A zerk is a grease fitting that allows lubricant to enter the bearing. Using high pressure, a grease gun is used to push the lubricant into the bearing through the zerk.
What is the benefit of self-lubricating rod ends?
Self-lubricating rod ends eliminate the need to re-grease bearings. By using PTFE or nylon, the rod end is greased for life, so there is no ongoing maintenance required.
When do you need to replace a rod end?
Replace the rod end if you can feel excessive play or there is excessive noise in the application. Rod ends can be optimized to meet application requirements without wearing out.
What type of material is used in rod ends?
- Stainless steel
- High-carbon steel