620 Stern Drive


Analysis Form

Every application is analyzed and approved by Konrad Application Engineers.  Please complete the Analysis Form and submit it online, or download the PDF to print, scan, email, or mail back to Konrad.  A Konrad Application Engineer will contact you to discuss your priorities and goals and determine the best Konrad sterndrive model for you.  You can also reach out to us anytime. We look forward to working with you!

Technical Information

For your convenience, we have downloadable documents that will help with the conversion process.

- 600 Series Installation Guide

- 600 Series Maintenance Manual





The Konrad 620 considered the workhorse of the fleet is a dependable, robust drive. By combining Konrad's proven, single propeller technology with strong shafts and gears, the 620 has set a new standard for stern drive durability.

intended for military, commercial, medium duty, and recreational performance the konrad 620 offers

  • Oversized bearings
  • Thicker walled casings

  • One piece propeller shaft
  • Continuous oil circulation for cool operation
  • No corrosive exhaust through drive
  • Precision machined super alloy gears
  • No failure-prone cone clutch
  • Minimal maintenance required
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Package Options

Standard Equipment (Supplied with Sterndrive)

  • Complete sterndrive assembly
  • Inner and outer transom assembly
  • Trim gauge and Trim pump assembly
  • Oil reservoir with low level sensor for use in hull
  • Drive comes full of sterndrive lubricant
  • Two quarts of power trim fluid

Additional Equipment Required (Not supplied but available for purchase from Konrad)

  • Transmission
  • Propeller
  • Steering package
  • Drive shafts/transmission tail piece
  • Bellhousing adapter
  • Flywheel coupling
  • Transmission oil cooler
  • Alignment tool

Options for Individual Applications (Available for purchase from Konrad)

  • Dual Helm kits
  • Isolator Mounts
  • Installation tool kit
  • Extension kits
  • Tie bars
  • Stand off boxes
  • Technical engineering assistance

Material / Manufacturing Specifications

Taper roller bearings, spaced for optimum load carrying capabilities, support the shafts

Manufactured from high strength, heat treated aluminum

High strength heat treated alloy steel utilizing high performance marine technology

Manufactured from high alloy, heat treated steel

Industry leading size for increased load carrying capacity and extended life

Installation / Operational Specifications

Recreational or Commercial

Engine Connection
Direct or Remote (Jack or CV Shaft)

None through the sterndrive

Gear Ratios
1.27:1, 1.45:1, 1.55:1, 1.78:1, 1.98:1

Full Immersion, sixteen quarts with external reservoir

Diameter Range - 17.25 in - 20 in (43.8 cm - 51 cm)

Operates in either right or left hand rotation

Steering Angle
56° range

Reversing transmission required

Transom Mounting
Template available per application

Transom Requirements
13° angle nominal, 6.4 mm - 79.4 mm (1/4 in - 3 1/8 in) thick

Trim/Lift System
Approximate -6° to +10° (trim)
Approximate 30° of total lift range

Water Pickup
None through the sterndrive