Alpha One & Gen 2 Outdrive Parts *Drawings *Videos
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Mercruiser Alpha One lock nut *Lower unit parts

Outdrive lock nuts for lower gearcase forward gear with illustrated photo

  • (5 pack) Mercruiser Alpha 1 lock nuts
  • Used on both the lower unit and upper gearcase
  • OEM 11-13439-1
  • Exploded view Mercruiser drawings
    Search by part number or description here

21170 lock nuts

21170 lock nuts

P/N 21170 Lock nuts five units OEM 11-13439-1 $15.99
21180 lock nuts

21180 lock nuts

P/N 21180 Lock nuts 5 units 11-13438 $9.95
21190 lock nuts

21190 lock nuts

P/N 21190 Lock nuts 5 units 11-13436 $9.95
21161 stainless steel

21161 stainless steel

P/N 21161 Lock nut 11-45812 $4.95

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