Mercury – Cotter Pin | Swivel Bracket Hardware | Stainless Steel | 93861

Overview

Every boater knows the big parts get all the glory, but it’s the small, unseen hardware that quietly keeps everything moving the way it should. The Mercury 93861 Cotter Pin is one of those unsung heroes. When you’re working with a high-horsepower TwoStroke engine, you need absolute confidence that every component—right down to the smallest pin—is built to last. This little piece of stainless steel delivers that peace of mind. It sits there on your swivel bracket, taking on vibration, spray, and long days on the water without complaint, giving you one less thing to worry about when you’re running hard across open water.

Key Features

• Secures swivel-bracket components on select high-horsepower Mercury TwoStroke engines
• Crafted from durable stainless steel for strength and corrosion resistance
• Tested in harsh marine conditions for long-lasting reliability
• Meets all Mercury Marine OEM specifications
• Designed for stable fitment under heavy load and constant vibration

Engine & Boat Compatibility

The Mercury 93861 Cotter Pin fits a wide range of high-performance outboards, including:

• Mercury V150–200hp TwoStroke (serial numbers 4301235–0C100860)
• 300 and 300X 3.0L EFI Pro Max / Super Magnum (0G610221–0T999587)
• 2.5L 200hp Pro XS (0T235000–1E000796)
• 3.0L 255hp Pro XS (0T651945–0T997973)
• 225 and 225X Pro Max / Super Magnum (0G610104–0T819605)

Well-suited for performance bass boats, offshore hulls, tournament rigs, and any setup pushing serious horsepower.

Performance & Practical Benefits

It may look simple, but a cotter pin on a high-horsepower engine sees a tough life—vibration, torque loading, constant water exposure, and the strain of rapid steering response. This Mercury Marine part is built to handle all of it. The stainless steel construction resists corrosion even in saltwater, keeping the pin tight and secure season after season.

You’ll notice the difference in:

• Steady, predictable steering feel
• Reduced wear on related components
• A tight, confident fit that holds its shape under stress
• Smooth bracket movement without play or looseness

A reliable cotter pin prevents small issues from becoming big repairs. With the right hardware in place, the engine feels solid, responsive, and ready for whatever the day brings.

Why Buy OEM

You might be tempted to use a generic cotter pin, but high-horsepower engines demand better than that.

• Exact OEM sizing ensures the correct fit—no wobble, no guessing
• Built from materials tested specifically for Mercury applications
• Withstands torque and vibration far better than generic alternatives
• Helps maintain the integrity of surrounding parts
• Backed by decades of Mercury engineering and real-world testing

When you’re running a powerful TwoStroke, OEM hardware isn’t a luxury—it’s the smart choice for long-term reliability.

FAQ

Q1: Which engines does the Mercury 93861 Cotter Pin fit?

It fits several Mercury high-horsepower TwoStroke outboards, including V150–200hp, Pro Max, Super Magnum, and select Pro XS models.

Q2: What makes this different from aftermarket cotter pins?

It’s engineered to Mercury’s specifications, with stainless steel strength and proven durability in marine conditions.

Q3: How do I confirm this is the right pin for my engine?

Check your outboard’s serial number against the ranges listed in your service manual or above.

Q4: Can it be used in both fresh and saltwater?

Yes. The stainless steel construction is built to resist corrosion in any environment.

Q5: Is installation straightforward?

Very—most boaters can install it with basic hand tools, following the service manual.