Mercury – Sterndrive Installation Hardware Kit | Alpha & Bravo Series | Stainless Steel Fasteners | 859116K01

Overview

Any boater who has spent time around sterndrives knows how important solid, reliable hardware is. When you’re pulling the drive to service a bellows or reinstalling after maintenance, you want fasteners that feel tight, clean, and trustworthy. That’s why this genuine Mercury Marine part stands out. The 859116K01 hardware kit gives you the reassurance that the bell housing on your Alpha or Bravo drive is secured with the same quality components used at the factory — no shortcuts, no compromises.

Key Features

• Includes six Stainless Steel nyloc nuts and six Stainless Steel washers
• Designed specifically for attaching MerCruiser sterndrive bell housings
• Built to match Mercury Marine engineering requirements
• One-time-use nyloc nuts for maximum security
• Reliable grip that holds firm under vibration and load

Engine & Boat Compatibility

• Made for MerCruiser MC-1, R, MR, Alpha, and Bravo series sterndrives
• Fits runabouts, cruisers, sport boats, and many lake and coastal vessels
• Ideal for full sterndrive service or seasonal maintenance work

Performance & Practical Benefits

When you tighten these fasteners, you can feel them seat with a smooth, steady bite. The Stainless Steel construction resists corrosion, an important detail for anyone boating in saltwater or brackish environments. Mercury Marine’s nyloc nuts are designed to grip strong the first time, preventing loosening from engine vibration or hull impact. This is one of those situations where the hardware truly matters — the bell housing is too important to rely on weak or reused parts.

This kit makes the process simple: the pieces fit cleanly, the threads engage the way they should, and the installation feels controlled instead of forced. Once everything is torqued down, you know it’s secure, which means fewer worries and more confidence when you head back out on plane.

Why Buy OEM

With sterndrives, precision isn’t optional. Using genuine Mercury Marine parts ensures you’re installing hardware built specifically for the stresses of these systems. Aftermarket nuts may look similar, but they rarely match the exact thread quality or grip strength Mercury requires. OEM hardware fits right, lasts longer, and gives you peace of mind knowing the drive is held together the way the engineers intended. It’s a small investment for long-term reliability on the water.

FAQ

Q1: Which sterndrives does this kit fit?

It fits MerCruiser MC-1, R, MR, Alpha, and Bravo series drives.

Q2: What makes this different from non-OEM hardware?

The fit, strength, and Stainless Steel quality meet Mercury’s manufacturing standards, ensuring proper retention and long-term durability.

Q3: How do I know if this is the right kit for my boat?

If your drive falls under the Alpha or Bravo family, this is the correct bell housing hardware set.

Q4: Can it be used in freshwater and saltwater?

Yes. Stainless Steel construction holds up well in both environments.

Q5: Do the nyloc nuts need to be reused?

No — Mercury specifically recommends replacing them after each use for proper security.