Prop Tight Nut

Prop Tight Products for Sale – USA & International Delivery

Prop tight nuts are essential for securely fastening propellers to your boat’s shaft, preventing loosening and ensuring reliable performance. The Prop Tight brand offers precision-machined nuts designed for inboard and outboard propellers, providing easy installation and durable, long-lasting hold. Ideal for recreational boats, workboats, and commercial vessels, these nuts help maintain propeller alignment and safe operation on the water.

What it does

• Holds the prop firmly seated on the shaft taper
• Resists loosening from vibration, reverse thrust, or prop walk
• Often replaces the standard hex prop nut + jam nut setup

How it works

• Threads onto the prop shaft like a normal prop nut
• Uses mechanical locking geometry (often a captured or wedge-style design)
• As the prop is loaded forward or in reverse, the nut maintains preload instead of relaxing
• Typically, it is still used with a cotter pin or locking feature for safety

Why people use a Prop Tight Nut

• More secure than a single standard nut
• Cleaner installs than nut + jam nut combos
• Reduces chance of prop creep or fretting on the taper
• Popular on high-torque diesel inboards and commercial boats

Where you’ll see them

• Inboard shaft boats (gas & diesel) Sportfish, trawlers, workboats Boats that see frequent reversing or heavy loads