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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 PROP SECURITY I got one of these for my yamaha motor about one and a half years ago, and it works very well. I use it in and out of the water, and it has held up great. Now I don't always worry about losing the prop to theft. March 16, 2008
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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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