R & D Engine Mount w/4" Footprint - 5/8" Stud - 300lbs Capacity Per Mount

The R & D Engine Mount w/4" Footprint - 5/8" Stud - 300lbs Capacity Per Mount is purpose-built for anglers and boaters who demand reliability under constant stress. Marine engines experience relentless punishment from forward and reverse thrust, vibration transmitted through the drivetrain, and the cumulative shock of running through rough water. These engine mounts solve that problem by isolating vibration while maintaining the structural rigidity needed to handle propeller loads, keeping your powerhead stable and your boat operating smoothly across all conditions.

The design combines dual-durometer elastomer technology with a rigid steel footprint to achieve a precise balance: stiff enough to control engine movement during acceleration and deceleration, yet compliant enough to dampen the harmonics that fatigue components and wear bearings over time. The 4-inch footprint provides stable mounting geometry, while the 5/8-inch stud diameter offers proven holding power across standard R & D Marine and OEM engine frame configurations. At 300 pounds capacity per mount, a pair of these mounts handles the full weight of mid-range marine powerheads with margin for dynamic loading. The 1.8-pound weight and compact 6 x 4 x 6-inch envelope make installation straightforward in tight engine compartments without adding unnecessary mass.

Experienced boaters rebuilding or restoring outboards, or upgrading worn OEM mounts, recognize that engine isolation directly affects ride quality, component longevity, and fuel efficiency. These mounts work best on boats running in the 16- to 40-foot range where weight distribution and vibration control matter most. Always verify stud diameter and mounting pad dimensions against your specific engine frame before ordering, and plan for the bolt and washer hardware separately. R & D Marine engine mounts are a core component for anyone serious about maintaining a smooth, quiet, long-lived installation.