Description Of Jks Control Arms
Adjustment Threads
Threaded adjustable control arms are not uncommon in the marketplace, but JKS has taken a unique approach to designing its control arms. For starters, 18-tpi (threads per inch) adjustment threads were utilized instead of the mere 5-tpi threads found on most other control arms. The fine thread pitch is actually stronger due to better thread engagement and a larger cross section since less material is removed during the thread forming process.
In addition to the overall increase in strength, the fine thread pitch also allows greater precision when adjusting the control arm length. Each turn of the rotating end fine-tunes the length a minute 1/16 inch. With over 3 inches of adjustment available, the working length of each JKS control arm can be increased, decreased, or left exactly the same as the OE suspension arm.
The free-rotating JKS design doesn't require a jam nut either - jam nuts have been known to loosen on the trail or seize up when you want to make an adjustment. Instead, each end twists with the respective axle and chassis mounts for unrestricted suspension articulation. JKS also incorporates a special internal stop mechanism that ensures full thread engagement at all times. Simply put, the control arm can't be unthreaded far enough to compromise strength and safety.
Internal Support Bearing
Another unique feature of the JKS control arm is the internal support bearing. This slippery brass bearing is a vital part of the design that counteracts any lateral loads, ensuring the inner rod remains concentric with the outer body. Without the bearing, the adjustment threads would be vulnerable to excessive leverage, which could eventually lead to deformation. According to JKS, thread deformation is the primary reason that other control arms can wear out prematurely and produce noise that transmits into the vehicle cabin.
Lubrication System
The reliability of the JKS design requires a lubrication system that can evenly distribute grease to all internal contact surfaces. Although JKS prelubricates all of its arms before they are packaged and shipped, it will be necessary for the user to add grease at regular maintenance intervals. Lubricant is pumped into the external grease zerk which aligns with an internal channel that is machined into the adjustment threads. The channel also ensures distribution of the grease to the internal support bearing. A spring-loaded seal keeps the lubricant where it belongs while preventing moisture and contaminants from entering the control arm.