U.S. Customers: Orders shipped from Canada may be subject to U.S. import duties, taxes, and/or tariffs as assessed by U.S. Customs and your carrier. These charges are not included in our product prices or shipping rates. You are responsible for any duties/tariffs/fees due on delivery or prior to delivery.
Packed and shipped within Canada!

Original & OEM Quality Parts

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Yamaha Outboard Lower Unit Lock - 74059 - 371-74059F1

Mcgard Locks
$98.22

Designed specifically for Yamaha lower units, this set features a stainless steel locking bolt. Simply replace one of the original bolts above the propeller with a McGard locking bolt. Once installed, the lower unit lock bolt offers 24 hour protection. Constructed of through-hardened stainless steel for maximum security. A free-spinning collar will turn if attacked by gripping tools without loosening the lock to avoid costly theft. For maximum security, use the Yamaha lower unit lock bolt in conjunction with a McGard outboard motor lock. 3.22" overall lengthM10 x 1.25 thread size5/8" hex sizeSet includes lock bolt and key

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Twin Stern Drive Lock 7/16 - 74019 - 371-74019F1

Mcgard Locks
$108.01

Simply replace one of the sterndrive mounting nuts for theft protection. Stainless steel with free-spinning collar that will turn if attacked by gripping tools. No assembly required. Fits Mercruiser®; Alpha, Bravo I-III (Incl. X & XR), Blackhawk, OMC Cobra & King Cobra, and Volvo SX & DP-S stern drives. 74019 twin drive set includes 2 locks and 1 key. Carded for pegboard or for P.O.P. merchandiser.

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Single Stern Drive Lock 7/16 - 74018 - 371-74018F1

Mcgard Locks
$75.21

Simply replace one of the sterndrive mounting nuts for theft protection. Stainless steel with free-spinning collar that will turn if attacked by gripping tools. No assembly required. Fits Mercruiser®; Alpha, Bravo I-III (Incl. X & XR), Blackhawk, OMC Cobra & King Cobra, and Volvo SX & DP-S stern drives. 74019 twin drive set includes 2 locks and 1 key. Carded for pegboard or for P.O.P. merchandiser.

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Single O/B Lock 5/16-18 F/Sm - 74049 - 371-74049F1

Mcgard Locks
$77.49

Designed to lock the outboard onto the transom, simply replace one of the mounting nuts with a McGard locking nut. A free spinning collar turns if attacked by gripping tools, protecting against theft and inconvenience. (74049 fits most of the motors listed and will fit other small outboards with a 5/16" hole in the transom bracket for mounting the motor.)

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Propeller Lock, M18 X 1.5 - 74040 - 371-74040F1

Mcgard Locks
$138.63

The best protection available against costly propeller theft. Once installed the McGard propeller lock offers 24 hour protection during use, storage and transit. A free-spinning collar will turn if attacked by gripping tools without loosening the lock. Constructed of naval brass and hardened stainless steel for maximum security.

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Propeller Lock, 3/4-16 - 74039 - 371-74039F1

Mcgard Locks
$153.89

The best protection available against costly propeller theft. Once installed the McGard propeller lock offers 24 hour protection during use, storage and transit. A free-spinning collar will turn if attacked by gripping tools without loosening the lock. Constructed of naval brass and hardened stainless steel for maximum security.

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Prop Lock-Volvo Duo Prop - 74057 - 371-74057F1

Mcgard Locks
$170.05

The best protection available against costly propeller theft. Once installed the McGard propeller lock offers 24 hour protection during use, storage and transit. A free-spinning collar will turn if attacked by gripping tools without loosening the lock. Constructed of naval brass and hardened stainless steel for maximum security.

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Prop Lock (J/E) 40-130 H.P. - 74052 - 371-74052F1

Mcgard Locks
$132.90

The best protection available against costly propeller theft. Once installed the McGard propeller lock offers 24 hour protection during use, storage and transit. A free-spinning collar will turn if attacked by gripping tools without loosening the lock. Constructed of naval brass and hardened stainless steel for maximum security.

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Outboard Lock 50Hp Yamaha & Up - 74037 - 371-74037F1

Mcgard Locks
$77.49

Designed to lock the outboard onto the transom, simply replace one of the mounting nuts with a McGard locking nut. A free spinning collar turns if attacked by gripping tools, protecting against theft and inconvenience. (74049 fits most of the motors listed and will fit other small outboards with a 5/16" hole in the transom bracket for mounting the motor.)

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Outboard Lock 40Hp Mercury & Up - 74036 - 371-74036F1

Mcgard Locks
$77.49

Designed to lock the outboard onto the transom, simply replace one of the mounting nuts with a McGard locking nut. A free spinning collar turns if attacked by gripping tools, protecting against theft and inconvenience. (74049 fits most of the motors listed and will fit other small outboards with a 5/16" hole in the transom bracket for mounting the motor.)

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Outboard Lock 40Hp J/E & Up - 74038 - 371-74038F1

Mcgard Locks
$77.49

Designed to lock the outboard onto the transom, simply replace one of the mounting nuts with a McGard locking nut. A free spinning collar turns if attacked by gripping tools, protecting against theft and inconvenience. (74049 fits most of the motors listed and will fit other small outboards with a 5/16" hole in the transom bracket for mounting the motor.)

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Bravo Iii-Blackhawk Prop Lock - 74053 - 371-74053F1

Mcgard Locks
$187.88

The best protection available against costly propeller theft. Once installed the McGard propeller lock offers 24 hour protection during use, storage and transit. A free-spinning collar will turn if attacked by gripping tools without loosening the lock. Constructed of naval brass and hardened stainless steel for maximum security.

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4 Trailer Wheel Locks - 74041 - 371-74041F1

Mcgard Locks
$59.95

1/2-20 thread cone seat wheel locks and lug nuts. Guaranteed for life not to rust, chip or peel. Triple-nickel, chrome-plated steel.

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2 Trailer Wheel Locks Set - 74042 - 371-74042F1

Mcgard Locks
$43.49

1/2-20 thread cone seat wheel locks and lug nuts. Guaranteed for life not to rust, chip or peel. Triple-nickel, chrome-plated steel.

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Our products are shipped from Canada!
Parts Warehouse:
Toronto, Ontario, Canada
Head Office:
Kingston, Ontario

About Us

Northern Marine is a Canadian supplier of OEM and premium aftermarket marine and RV parts and accessories. We focus on quality, accurate listings, and dependable fulfillment so you can maintain, repair, and outfit your boat or RV with confidence.

Our goal is simple: get you the right parts, shipped fast, with straightforward service you can count on.