When securing an outboard motor during trailering, storage, or storage, choosing the right lock is essential. This guide highlights five effective options designed for different boaters, from casual anglers to owners of larger vessels. Each product is evaluated on durability, ease of use, and compatibility with common engines. The buyer types best served by each option are noted to help you pick confidently. A quick summary table follows to compare key points at a glance.
| Product | Best For | |
|---|---|---|
| Transom Saver Support With Locks | Trailer Owners Needing Complete Transom Security | Includes two locks for added security and a padded support |
| FIGODE Stainless Steel Chain Lock | Long-Term, All-Around Anti-Theft | All-metal stainless design with multiple keys |
| Outboard Hydraulic Steering Lock | Trailering In Motion | Focus on preventing engine swing during transport |
| MARINE CITY 304 Stainless Steel Engine Lock | Corrosion-Resistant, Salt & Fresh Water | High-grade stainless locking mechanism with anti-rattle features |
| 304 Stainless Outboard Motor Lock | Versatile, Broad Engine Fit | Adjustable clamp for a wide range of bolt diameters |
Transom Saver Support With Locks For 3 Rams Outboard Boat

The Transom Saver set includes a rubber transom saver and two locks, designed for Yamaha, Mercury, Evinrude, Suzuki, and Honda installations. Best for trailer setups needing both stabilization and lock security. The rubber construction helps dampen vibrations and reduce wear on the stern.
Who this is for: boat owners who trailer frequently and want a complete locking solution for the transom area. Why chosen: combined support and locking capability offers straightforward installation and enhanced protection against removal attempts. Caution: check two-lock compatibility with your mounting hardware to avoid fit issues.
FIGODE Stainless Steel Chain Lock With 4 Keys

FIGODE’s stainless steel chain lock features a rustproof chain and four keys, suitable for marine, bike, scooter, and more. Best for owners who want a simple, all-metal anti-theft solution with easy key management. The 110 cm chain length provides flexible securing options around the engine or trailer hitch.
Who this is for: boaters seeking a robust, corrosion-resistant chain lock with multiple keys for shared access. Why chosen: high-quality materials improve longevity in harsh environments. Caution: chain length may be shorter than some oversized engine mounts; verify fit before purchase.
Outboard Hydraulic Steering Lock For Trailering

This hydraulic steering lock is designed to stabilize the outboard during trailering with a two-pack setup. Best for boats that frequently travel long distances or encounter windy conditions where steering stability matters. It helps prevent unwanted engine swing while on the road.
Who this is for: trailer users who need an added layer of protection against movement during transport. Why chosen: two-piece design provides redundancy and adjustable positioning. Caution: ensure compatibility with your specific steering linkage and mounting hardware to avoid interference with steering control.
MARINE CITY 304 Grade Stainless Steel Engine Lock

Made from polished 304-grade stainless steel with a 316-grade core, this lock clamps to engine fixings to deter theft. Best for saltwater and freshwater use where corrosion resistance is critical. The lock’s design minimizes engine vibration by adding sponge linings inside the clamp halves.
Who this is for: boaters who require a corrosion-resistant, vibration-dampening engine lock. Why chosen: strong material combination with anti-rattle features. Caution: ensure the clamp size matches your engine’s mounting bolts for a proper fit.
304 Stainless Outboard Motor Lock

This lock is built from high-quality stainless steel with an adjustable clamp that fits bolt diameters up to 1.56 inches. Best for versatile use across many engine brands. The compact design fits without obstructing performance while delivering solid anti-theft protection.
Who this is for: boatowners seeking a flexible lock that fits a wide range of engines. Why chosen: adjustable clamp increases compatibility across models. Caution: verify bolt diameter limits to ensure a proper fit for your specific engine.
Buying Guide
What to consider when choosing an outboard motor lock:
- Environment: choose corrosion-resistant materials (304/316 stainless) for saltwater use and ensure the locking mechanism resists rust.
- Compatibility: confirm bolt diameter range and mounting style matches your engine’s transom and mounting hardware.
- Security features: look for locks with multiple keys, robust core materials, and protective padding to reduce rattling and wear.
- Installation ease: prefer locks that require minimal tools and offer clear alignment guides to avoid installation errors.
- Redundancy: consider a combination approach (locking along with a transom saver or chain) for enhanced protection during trailering.
FAQ
- Q: Are these locks suitable for all outboard brands?
A: Most are designed for common brands like Yamaha, Mercury, Suzuki, Evinrude, and Honda, but always verify fitment with your engine’s mounting hardware. - Q: Do these locks prevent all theft attempts?
A: They deter casual theft and unauthorized removal but no lock is completely theft-proof. Combining methods (lock plus transom saver or chain) increases security. - Q: Will the locks affect engine performance or cooling?
A: Properly installed locks should not interfere with engine performance; always follow manufacturer installation guidelines. - Q: How do I choose between a chain lock and a stainless steel motor lock?
A: Chains offer flexible securing around larger areas; motor locks provide direct protection at the mounting point. Your choice depends on where you want the most protection. - Q: Can these be used for both saltwater and freshwater boats?
A: Yes, but prioritize corrosion-resistant materials for saltwater use to extend longevity. - Q: Do any include multiple keys?
A: The FIGODE chain lock includes four keys, which is useful for shared access or backup.
