Mercury – Quicksilver 818883A1 Thumb Screw Assembly Kit | Mercury 25–30HP FourStroke & 40–60HP TwoStroke Outboards | 818883A1

Overview

A fresh set of transom thumb screws can make your outboard easier to adjust — and look sharper while doing it. The Mercury 818883A1 Thumb Screw Assembly Kit restores both the appearance and function of your engine’s transom bracket.

Built with durable stainless steel screws and a sleek chromate-finish handle, this OEM kit is made for Mercury 25–30HP carbureted FourStroke and 40–60HP carbureted TwoStroke outboards. It’s an easy upgrade that keeps your engine secure and looking factory-new.

Key Features

• Purpose: Replaces old or corroded thumb screws to restore transom bracket performance and appearance.
• Fitment: For Mercury 25–30HP FourStroke and 40–60HP TwoStroke carbureted outboards.
• Kit Contents: Includes two stainless steel thumb screws, one handle, one rivet, one washer, and one shoulder screw.
• Construction: Stainless steel and chromate-finish materials resist rust and corrosion in salt or freshwater.
• Design: Easy-to-grip handle makes tightening and loosening simple and comfortable.

Engine & Boat Compatibility

• Mercury 25–30HP FourStroke carbureted outboards
• Mercury 40–60HP TwoStroke carbureted outboards
• Works with portable and small outboard transom brackets

Performance & Practical Benefits

The 818883A1 kit not only secures your motor but also improves how it feels to adjust or remove. The smooth-thread stainless screws hold firmly without seizing, while the chrome-finished handle adds a polished look.

It’s built to handle years of exposure to salt, spray, and vibration. Replacing your old hardware with this OEM kit ensures a perfect fit and a more comfortable, secure hold when clamping your motor to the transom.

Why Buy OEM

Mercury’s OEM hardware is engineered for strength, precision, and corrosion resistance that aftermarket parts often lack. The fit and finish are exact, meaning the components tighten cleanly and stay put through seasons of use.

A genuine Quicksilver kit matches your engine’s original design, both in appearance and performance — no modifications, no surprises, just factory-quality reliability.

FAQ

Q1: What engines fit the Quicksilver 818883A1 kit?
A: It fits Mercury 25–30HP FourStroke carbureted and 40–60HP TwoStroke carbureted outboards.

Q2: What’s included in the kit?
A: Two thumb screws, one handle, one rivet, one washer, and one shoulder screw.

Q3: Is the hardware corrosion-resistant?
A: Yes. The thumb screws are stainless steel, and the handle has a durable chromate finish.

Q4: Is it easy to install?
A: Very. The kit installs with basic tools in just a few minutes.

Q5: Why OEM instead of aftermarket?
A: OEM hardware fits perfectly, lasts longer, and maintains Mercury’s original look and reliability.