This bolt kit is for Jeep JK Wrangler front and rear UPPER control arms. Fits 2007-2018 JK Wranglers. Our Caster Offroad flag nuts use precision laser welding—an advanced method designed to deliver consistent strength and reliability. Click HERE to read about the difference between arc and laser welding. 

• 8 Flange Bolts
• 6 Flange Nuts
• 2 Caster Offroad locking full-depth laser welded flag nuts
• 10.9 Grade Heavy-Duty Hardware
• Manufactured by Caster Offroad for strength and fitment
  

The correct stock size control arm bolts are metric. Many aftermarket “SAE upgrade” kits replace the factory metric hardware with oversized bolts (11/16s, 9/16s, etc.), which often requires drilling and permanently alters the joint, reducing bushing sleeve strength. Instead of changing bolt diameter, we stuck with metric and use a properly engineered shoulder so the bushing sleeve is supported on the shoulder instead of the threads. This restores clamp stability and prevents movement without compromising the original suspension components or geometry. Many SAE-based kits exist due to availability and higher costs of fine-thread metric hardware, not because changing bolt diameter provides an engineering advantage.