Mercury – Quicksilver Propeller Hex Nut | Prop Hardware Component | Hardened Brass | 40140

Overview

Keeping your propeller tight and secure is essential for smooth performance, and the Mercury Marine 40140 Quicksilver Hex Nut does exactly that. Designed for Mercury and Mariner 5–15 horsepower outboards, this durable brass prop nut features precision-cut M10x1.5 threads and a built-in nylon locking insert to hold firm under vibration and load. Engineered to Mercury’s factory torque standards, it ensures your prop stays tight, your power transfer stays consistent, and your time on the water stays trouble-free.

Key Features

• Purpose: Secures the propeller to the shaft, ensuring efficient power transfer and stable operation.
• Material: Made from hardened marine-grade brass for long-term strength and corrosion resistance.
• Design Detail: M10x1.5 thread size with nylon locking insert for a vibration-resistant hold.
• Performance: Tested to exceed Mercury Marine torque and durability standards.
• Compatibility: Fits Mercury/Mariner 5–15HP outboards using brass prop nuts.
• Durability: Built to handle continuous marine stress, heat, and exposure without loosening or seizing.

Engine & Boat Compatibility

• Mercury and Mariner 5–15HP outboards that use M10x1.5 propeller shafts.
• Ideal for small fishing boats, inflatables, tenders, and aluminum runabouts.
• Safe for both freshwater and saltwater use.
• Compatible with OEM Mercury propeller assemblies and shafts.

Performance & Practical Benefits

The 40140 prop nut provides a secure, vibration-resistant fit that keeps your prop exactly where it should be — tight against the hub, transferring power efficiently. The nylon locking insert prevents loosening, even after long days on the water or under heavy loads.

Its brass construction resists corrosion and galling, so it won’t seize onto the prop shaft or wear out under repeated tightening. It’s a simple part that plays a critical role in keeping your propeller assembly smooth, quiet, and dependable.

Why Buy OEM

Mercury’s Quicksilver 40140 Hex Nut is a genuine OEM part, built to the exact specifications of your engine. Aftermarket hardware can vary slightly in thread pitch, strength, or material quality, leading to loose fits or premature corrosion.

OEM hardware is tested for strength, balance, and torque retention — meaning it’ll hold up season after season without compromising your drivetrain. With Mercury, you’re getting reliability that’s been proven on the water, not just in theory.

FAQ

Q1: What engines does this nut fit?
It fits Mercury and Mariner 5–15HP outboards using M10x1.5 threaded shafts and brass prop nuts.

Q2: What’s the benefit of the nylon insert?
It keeps the nut from loosening under vibration, maintaining a tight, secure fit.

Q3: What’s it made of?
It’s built from hardened brass, tested to resist corrosion and marine wear.

Q4: How tight should it be installed?
Tighten to the torque spec listed in your owner’s manual for your specific outboard model.

Q5: Why choose Mercury OEM?
OEM parts ensure the right fit, thread precision, and strength — critical for propeller safety and performance.