HSF 20-25 Explorer ST Upgraded Rear Differential Bolt

Upgrade the oem 10.9 bolt to a 12.9 You might be asking what’s the difference? The numbers indicate the tensile and yield strength of each bolt. Tensile strength of a bolt is the amount of force a bolt can withstand when it is being stretched without being deformed. Yield strength is the maximum load without permanent deformation. A 12.9 has a rating of about 175000 to 180000 psi tensile strength and is about 20-25% stronger than 10.9. therefore making this a beefier stronger option. To remove the oem bolt you’ll need an 18mm socket and to install your new upgraded bolt, you’ll need a 12mm hex head socket. I recommend torquing these to 150ft/Ibs  what comes in the package 1- 12.9 bolt 1-stainless steel washer