Designed specifically for smaller, clamp-mounted outboard engines
The original solution for locking outboard motors or engines to a boat's transom to prevent outboard motor theft. These are for use where an outboard engine is attached using the engine's clamping bracket. Your outboard is valuable and vulnerable. No outboard is insured in the UK unless it is locked on with an insurance approved lock.
The slot in the lock covers the two clamp heads making it nearly impossible for a potential thief to get access to them.
We make five models of insurance approved slot locks because our extensive research and development has shown the importance of having the correct size of lock for the outboard motor you have.
Choosing the right Slot Lock
If you are unsure as to which Slot Lock you require then please measure across the width of your toggles once aligned up straight:
- If less than 150mm then an Atlantic 170 is required
- If less than 165mm then an Atlantic 195 or 200 is required
- If over 165mm then an Atlantic 230 is required
- If over 190mm then an Atlantic 260 is required
- Small Slot Lock for Honda and Suzuki 2 to 3hp
Click here to download a .pdf on how to measure!
The suggested engine models are a guide only and can depend on the engines installation etc.
Atlantic Slot LocksThe Atlantic Slot Lock is our most substantial outboard motor lock and is made in five lengths: 170mm, 195mm, 200mm, 230mm and 260mm, each with a 14mm slot. A high security locking head (HSH) is supplied as is a black dust cap and a rubber liner. |
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Atlantic Slot Lock (170mm)For engines:
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Price: $109.95Delivery $14.50. Includes USPS Priority Mail postage (S&H) |
Atlantic Slot Lock (195mm) and (200mm)For engines: |
Price: $109.95Delivery $14.50. Includes USPS Priority Mail postage (S&H) |
Atlantic Slot Lock (230mm)For engines: |
Price:$109.95Delivery $14.50. Includes USPS Priority Mail postage (S&H) |
Atlantic Slot Lock (260mm)For toggles over 200mm across
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Price: $110.95Delivery $14.50. Includes USPS Priority Mail postage (S&H) |
Small Slot LockThe OML Small Slot Lock is a single unit using an seawater friendly Alko brass lock. It is suitable for Suzuki 2.5hp and Honda 2.3hp outboard motors only. For engines: |
Price: $89.95Delivery $8.95. Includes USPS Priority Mail postage (S&H) |

Small Slot Lock
We make five models of insurance approved slot lock because our extensive research and development has shown the importance of having the correct size of lock for the outboard motor you have. The Small Slot Lock is designed specifically for Honda and Suzuki 2-3hp.

Atlantic Slot Lock
The Atlantic Slot Lock is our most substantial insurance approved outboard motor lock and is made in four lengths: 170mm, 195mm, 230mm and 260mm; each with a 14mm slot. A high security locking head (HSH) is supplied as is a black dust cap and a rubber liner.

Pacific Bolt Lock
The Pacific Bolt Lock is our original insurance approved lock that now uses the same high security locking head as the Volcano. The Pacific Bolt Lock represents excellent value for money as well as unparalleled security. A black plastic cover is supplied.

The Volcano
The Volcano Bolt Lock represents the pinnacle of OML’s insurance approved bolt lock development. It is now regarded by many in the industry as the best bolt lock on the market as it has been designed and built to resist removal by the most robust actions.