M25X1 hex nut Polished chrome metal MB200 mini bike Here is the fork stem M25X1 hex nut for the Baja Mini Bike MB200 This is a LARGE hex cap nut; a very hard to find item Here is the fork stem M25X1 hex nut for the Baja Mini Bike MB200. This is a LARGE hex cap nut; a very hard to find item. Whatever your need in replacement Baja Motorsports parts, Monster Scooter Parts can get them for you. Whether an engine, a knobby-tread tire, or a M25X1 hex nut; we can keep your Baja rolling along.