The MGM Brakes Double Diaphragm Welded Mtg Bolts S-Cam Brake Drum is the ultimate solution for heavy-duty braking needs. With a mounting bolt thread of 5/8-11 and a length of 1.490", this unit is designed to fit seamlessly into your braking system. The port size of 3/8-18 NPTF ensures optimal performance and reliability. Featuring a stroke of 3.00", the S-Cam brakes provide powerful stopping power even under the heaviest loads. The double diaphragm design enhances the performance and reliability of the braking system, ensuring that you can rely on it when you need it the most. The standard stroke and parking brake features make this unit safe and easy to use, while the breather tube prevents moisture and contaminants from entering the braking system. The size of the port can impact the effectiveness of the braking system, and this unit is designed to provide optimal performance. FleetPride is your First Click in Heavy Duty®.