Mercury – Sterndrive Installation Hardware Kit | MerCruiser Series | Stainless Steel Fasteners | 859116Q01

Overview

When you are working on a MerCruiser sterndrive, the small details matter just as much as the big components. Hardware might seem simple, but seasoned boaters know the wrong fasteners can cause headaches down the road. The 859116Q01 hardware kit brings the peace of mind that comes from using components designed for your drive — clean threads, proper fit, and the kind of reliability you can feel as soon as you tighten each nut. It’s one of those Mercury Marine parts that quietly supports the performance of the whole system.

Key Features

• Includes six Stainless Steel nyloc nuts and six Stainless Steel washers.
• Designed for attaching bell housings on MerCruiser sterndrives.
• Built to Mercury Marine OEM engineering standards.
• One-time-use nyloc nuts for secure retention.
• Smooth, precise thread quality for confident installation.

Engine & Boat Compatibility

• Fits MerCruiser MC-1, R, MR, Alpha, and Bravo sterndrive families.
• Ideal for freshwater and saltwater boats of all types.
• Suited for routine drive service, rebuilds, and seasonal maintenance.

Performance & Practical Benefits

There’s something satisfying about hardware that threads cleanly and tightens the way it’s supposed to. That’s exactly what you get here. The Stainless Steel construction stands up to moisture, humidity, and salt exposure, keeping your drive installation clean and dependable. Each nyloc nut grips firmly on the first use and stays put even under the constant vibration of a sterndrive pushing through chop.

The kit takes the guesswork out of the job. You don’t have to wonder whether an aftermarket nut will hold or if the washer will corrode after a season. Everything in this set is built for the specific stresses of a MerCruiser bell housing, making installation smoother and the final fit more secure. For boaters who value reliability, this kit is an easy choice.

Why Buy OEM

Mercury Marine parts are engineered with intention, and hardware is no exception. Aftermarket options often fall short when it comes to thread consistency, load strength, and corrosion resistance. With OEM hardware, you’re using the exact components Mercury intended for your sterndrive, ensuring proper torque retention and long-lasting durability. It’s a smart investment for boaters who want their equipment to stay solid season after season.

FAQ

Q1: Which sterndrives does this hardware kit fit?

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

Q2: Why choose this over aftermarket hardware?

You’ll notice the difference in Stainless Steel quality, thread precision, and secure retention.

Q3: How can I confirm this is the right replacement?

If you’re servicing a MerCruiser drive in the MC-1 through Bravo family, this is the correct installation hardware.

Q4: Is this kit suitable for saltwater boats?

Yes. The Stainless Steel fasteners hold up extremely well in harsh marine conditions.

Q5: Are the nyloc nuts reusable?

No — they’re engineered for one-time use to maintain proper locking strength.