mounting bolts

[BoatR]

i am mounting a 175 merc on a hydraulic jack plate. i need to pick up a set of bolts before i head to cottage. what size and length and what grade of stainless steel to buy?

[150aintenuff]

i am mounting a 175 merc on a hydraulic jack plate. i need to pick up a set of bolts before i head to cottage. what size and length and what grade of stainless steel to buy?

motor to jack plate or jack to transom....


2.5" long 1/2" fine thread 304 stainless is what most jack plate mfg include for motor to jack

if you can get 308 or 316 stainless it would be stronger yet, 18-8 is comparable to grade 5 and is minimum required but not recommended imo..

personally id go to a mercury dealer and get a proper set of bolts in the length you need and that way you also get the brass nylock nuts to go with..

[j_martin]

If you use stainless nuts, put a bit of wax on the threads to prevent seizing.
An old candle, spray furniture wax, turtle wax, anything works.)

hope it helps
John

[150aintenuff]

If you use stainless nuts, put a bit of wax on the threads to prevent seizing.
An old candle, spray furniture wax, turtle wax, anything works.)

hope it helps
John

yep, or assembly lube works also

[sl!ck]

Also try and get Nyloc nuts so you can be fairly sure they won't loosen on you!