Suit:
Nissan Navara D40 Spanish built models with VIN# starting with VSK with the YD25 engine
Nissan Pathfinder R51 Spanish built models with VIN# starting with VSK with the YD25 engine
Nissan Navara D40 Thai built models with VIN# starting with MNT with the YD25 engine
This is the Large Bolt that Tightens the front of the harmonic balancer and locks it to the crank.
If there is any damage to the bolt, you should replace it, don't risk your harmonic balancer coming loose or even worse, falling right off.