5x Harley Davidson Softail Breakout FXBRS Black Titanium Rear Rotor Bolts 3/8-16 x 1". 5x Titanium Rear Disc Rotor Bolts with Pre-applied Threadlock for Harley Davidson Softail Breakout FXBRS. Titanium screws are best known for being strong, lightweight and corrosion resistant.