Mercruiser Alpha One lock nut

Mercruiser Alpha One lock nuts for lower gearcase forward gear with illustrated photo

Alpha One nuts # 39 with illustrated photo identified by matching order number #21170
OEM # 11-13439-1
Boating enthusiasts or auto mechanics performing their own work on outdrives will find this type layout extremely valuable
Drawings that show internal parts and their relationship with each other are listed under Alpha One parts lower gearcase

# 21170 Nut ( 5 Units )

# 21170 Lock nuts five units OEM # 11-13439-1 $9.89

21180 lock nuts

# 21180 Lock nuts five units OEM #11-13438 $9.89

21190 lock nuts

# 21190 Lock nuts five units OEM #11-13436 $9.89

21161 stainless steel lock nut

# 21161 Lock nut OEM # 11-45812 $5.89