Konrad Marine designs and manufactures stern drives with the power and endurance necessary to propel continuous duty vessels. The largest, strongest gears in the industry, coupled with thicker castings, oversized bearings, super alloy gears and large U-joints make Konrad Stern Drives the toughest, longest lasting drives available.
Konrad Marine Stern Drive 620B
Konrad Stern Drive Model 620BConsidered the workhorse of the fleet, the 620B is a dependable, robust drive. By combining Konrad's proven, single propeller technology with stronger shafts and gears, the 620B has set a new standard for stern drive durability. Prop range 17.25 in. (43.8 cm) to 20 in. (51 cm).
Konrad Marine Stern Drive 660B
Konrad Stern Drive Model 660BFor performance driven applications, such as extreme government patrol, the 660B is built to meet the demand for speed. With dual, counter rotating propellers, this drive is designed for 7-15 meter (23-50 foot) vessels with speeds up to 60 knots (70 mph). Prop range 13.25 in. (33.7 cm) to 16 in. (40.6 cm).
Konrad Marine Stern Drive 680B
Konrad Stern Drive Model 680BEngineered with the largest, strongest gears in the industry, the 680B gives you efficient carrying capacities up to 8.4 metric tons (over 18,500 lbs.) per drive. This model operates with extreme efficiency in the area of 40 knots (46 mph).Prop range 15 in. (38 cm) to 18.5 in. (47 cm).
Konrad Stern Drive Model 520
Konrad Stern Drive Model 520The Konrad 520 stern drive is engineered for people that work hard. Designed for commercial applications, the Konrad 520 is recognized for long-term durability. Now Konrad offers a heavy duty version with larger diameter shafts and bearings to handle higher horsepower diesel engines.
Konrad Stern Drive Model 540
Konrad Stern Drive Model 540The Konrad 540 Stern Drive provides excellent propulsion in hard working, high speed applications. Several assembly upgrades are available including the high performance lowers and heavy duty options. The HD has an upgraded input shaft that provides extra durability for extreme boating conditions.
Konrad Stern Drive Model 560
Konrad Stern Drive Model 560The Konrad 560 Twin Prop System was engineered to reduce stress on its gears using dual propeller technology, offering a durable drive you can depend on for years to come. The 560 Twin Prop drive features two, one piece stainless steel propeller shafts, fitted with line protection seals.
Boat Building / Repair
Propulsion / Power
Training / Education / Certification