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McGard® Propeller Lock


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  • Anti-theft device
  • Naval brass and hardened stainless steel construction
  • Maximum security for 24-hour protection
McGard’s Prop Lock is a convenient anti-theft device that doesn't have to be removed before entering the water. Its free-spinning collar turns without loosening the lock when attacked by gripping tools. Constructed of naval brass and hardened stainless steel. Once installed, McGard’s prop lock offers maximum security for 24 hour protection.

Model 74039 fits stern drives:
  • MerCruiser: Alpha 1, Bravo 1 (Including X & XR), TRS
  • OMC Cobra and King Cobra
Model 74039 fits outboards:
  • Mercury/Mariner 70 HP and larger (2 stroke)
  • Mercury 50 HP and larger (4 stroke) (except 225 HP 4 stroke before 2005)
  • Johnson/Evinrude 150 HP and larger (2 stroke)
Model 74040 fits stern drives:  
  • All Yamaha
Model 74040 fits outboards:  
  • Honda 75 HP and larger
  • Suzuki 40 HP and larger
  • Yamaha 115 HP and larger
  • Johnson/Evinrude 150 HP and larger (4 stroke)
Rated 4.8 out of 5 by 9 reviewers.
Rated 5 out of 5 by Great Investment I purchased my new McGard Prop Lock today because I have used them in the past with great success. When someone else is complaining about their prop being stolen, I always recomend McGard. With the cost of new stainless props being around $700, $50 dollars seems like a small price to pay for a little piece of mind. June 10, 2010
Rated 5 out of 5 by A++, Good Design Installation was easy. it only took 5 minutes while standing in the water at the boat launch. Ok, it would have easier on dry land. Note from a boat repair shop: Keep up with the lock!! June 1, 2010
Rated 5 out of 5 by prop lock this is for the guys who wrote about prop lock, it seems to me that it was to easy to install, did either of you have problems with it coming loose after awhile, i just bought it and put it on, i guess i`m just scared it will back off and i will lose my prop. April 20, 2010
Rated 5 out of 5 by Still works great... I bought this lock for my Tempest Plus prop about 1 year ago. I leave it on the boat at all times. This lock does not hinder the performance of my boat in any way. After a year of use it still looks like new and it works great too. I only use my rig in fresh water so I don't know how it would hold up in the salt. For fresh water use I give it 5 stars. January 16, 2009
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2 answers

Are each keyed differently

If you have this lock, how is it protected from thieves? If they are the Pro's, could they have a key to fit the lock or are they totally keyed different to eliminate this problem?
3 years, 11 months ago
 - joplin, mo
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looks like there are many different keys
2 years, 10 months ago
 - Lake Barkley KY
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Staff Answer
If thieves try to steal the prop, the stainless barrel of the lock/nut just spins, no matter how much they try to wrench on it. You have to have the McGard key and socket wrench to remove. You should keep your key with you not your boat. No worries about different keys.
2 years, 11 months ago
 - springfield, mo
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