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