Mercury 821 - 840

Replacement Keys
821 - 840 Key
821 - 840 Key
821 - 840 Key
821 - 840 Key
821 - 840 Key

$8.87
Free shipping eligible Ships free when your cart contains only free-shipping items and totals $35+.

The Mercury 821–840 replacement key series is designed to fit Mercury Marine and MerCruiser ignition systems using key codes 821 through 840. These precision-cut marine replacement keys are commonly used on boat ignition switches, control boxes, and marine rigging systems, providing dependable operation across a wide range of vessels.

 

This key series also fits Zeus SmartCraft Rigging systems, making it compatible with advanced Mercury and MerCruiser control setups used in modern marine applications. Manufactured to exact specifications for smooth operation and reliable fit, the Mercury / MerCruiser 821–840 keys offer an efficient solution for lost, worn, or damaged keys without requiring ignition replacement.

Ideal for boat owners, marine technicians, dealerships, marinas, and service professionals, these Mercury Marine and MerCruiser replacement keys restore secure access and ignition control quickly and cost-effectively.



MERCURY / YAMAHA / QUICKSILVER / MERCRUISER / ZEUS (DUPLICATE OEM-DO NOT CUT FROM GCODE) | BOAT LOCKS | DOUBLE-SIDED CUT KEY custom cut key

KEYS CUT On YH52 KEY BLANK.
Complete Mercury 821 - 840 Lock Code List