Konrad Marine’s 600 Series product line is taking stern drive technology to a whole new level. The sleek design is engineered for minimal drag, increased efficiency and load carrying capability. The multipiece housing assembly is designed to make service, overhauls and maintenance quick and efficient by providing easy access to all major internal components. Larger gears, up to 2 times stronger, provide exceptional durability that can handle higher torque inputs than other stern drives. The 600 Series product line is rated up to 1,200 Nm (885 lb. ft.) of torque and can handle propellers as large as 51 cm (20 inches) in diameter. The Konrad 600 Series has three models with several options available, allowing you to customize a stern drive to meet your needs. The 620 package is designed for lighter, single prop applications. For higher speed diesel applications, the 660s will provide outstanding performance and dependability with their twin 41 cm (16 inch) propellers. The 680 can handle heavier applications, designed to carry the loads of large cruisers and work boats. Konrad’s 600 Series stern drives are engineered with Harmonically Tuned Gear Train (HTGT) technology which optimizes the balance of the drives, providing significantly longer life to all components and a smoother running system. It enhances the performance, durability and reliability of your drives by minimizing drive vibrations and improving overall synchronization of internal components. This unique design feature is exclusive to the Konrad 600 Series and so advanced that no other drive in its class offers anything comparable.
620 DURABLE
Considered the workhorse of the fleet, the 620 is a dependable, robust drive. By combining Konrad’s proven, single 51 cm (20 inch) propeller technology with stronger shafts and gears, the 620 has set a new standard for stern drive durability.
620 Duty Classifications
Recreational Performance
Maximum recommendation
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1200 Nm (885 lb. ft.) of torque for diesel or gas applications.
Maximum operation
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250 hours per year for planing type hulls of highly intermittent operation.
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Gross weight to horsepower less than 12.2 kg/kw (20 lbs./hp).
This classification includes
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private
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non-commercial
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non-charter
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sport/leisure
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activity craft
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standard warranty
Military and Government Service
Maximum recommendation
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755 Nm (557 lb. ft.) of torque for diesel or gas applications.
Maximum operation
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500 hours per year for planing type hulls of highly intermittent operation.
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Gross weight to horsepower less than 12.2 kg/kw (20 lbs./hp).
This classification includes
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light commercial
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charter/sport
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activity craft,
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patrol and intercept boats
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standard warranty
Medium Duty Commercial Performance
Maximum recommendation
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678 Nm (500 lb. ft.) of torque for semi displacement and displacement mono hulls of intermittent operation with some variations in engine rpm and power.
This classification includes
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charter and commercial craft.
Note:
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these applications must be approved by the factory.
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standard warranty
Material and manufacturing specifications
Bearings
Tapered roller bearings, spaced for optimum load carrying capabilities support the shafts
Castings
Manufactured from high strength, heat treated aluminum
Gears
Six inch, high strength, heat treated alloy steel utilizing high performance marine technology
Shafts
Manufactured from high alloy, heat treated steel
U-Joints
Industry leading size for increased load carrying capacity and extended life
Installation and operational specifications
Application
Commercial, Military, and Recreational
Corrosion protection
Multiple anodes, all castings chromatized and layered with powder coatings
Engine Type
Diesel or Petrol
Gear Ratios
1.23:1, 1.45:1, 1.55:1, 1.78:1
Propeller diameters
51 cm (20 inch)
Steering range
56º
Trim/lift system
-6ºto 10º(trim)
10ºto 46º(lift)
Shifting
Reversing transmission required
Water pick up
None
