3) Gearbox flange details: Diameter of flange, Diameter of register, Bolt circle diameter of fixing holes, Size and quantity of holes. (Bolt circle diameter is the distance between the center of the hole at 12 o'clock position to the center of the hole at 6 o'clock)
Coupling Capacity = HP x Gear Ratio x 100/Max Rated RPM. Once your capacity is determined select your R&D Coupling that that matches the capacity for your engine.
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