Transom/jackplate bolts?

[pyro]

What's the standard-issue recommendation for mounting bolts? Type/grade? Diameter/thread pitch? I will be replacing my L&S hydraulic with a Rapid Jack manual, so I will need some new bolts and nylock nuts to replace the studs in the old plate. Links are appreciated. Thanks in advance.

[1BadAction]

Cheapest way you're going to get the right **** is from Merc. 1/2" Fine thread SS bolts, washers, and bronze locknuts.

10-67755A22 BOLT KIT, Transom (2.50 Inch)


10-67755A26 BOLT KIT, Transom (3.50 Inch)


10-67755A13 BOLT KIT, Transom (4.50 Inch)


10-67755A14 BOLT KIT, Transom (5.50 Inch)


10-67755A15 BOLT KIT, Transom (6.50 Inch)


10-67755A17 BOLT KIT, Transom (7.50 Inch)


10-67755A18 BOLT KIT, Transom (8.00 Inches)

I believe the kits are all in quantities of 4. 4 bolts, wide washers, narrow washers, and nuts. The washers themselves are also thicker than normal hardware.

[panther150]

If you do not use brass nuts , make sure you put some lube on the stainless nuts, nyloks, as it will gaul without it. I use a White thread sealer with PTFE, works great.

Steve

[capteliminator]

1badaction nailed it, use the merc stuff. Heavy duty hardware along with brass nuts.

[powerabout]

those nuts are not brass, they are bronze, or they should be, brass is crap

[tlwjkw]

a "touch" of anti-seize on stainless bolts ALWAYS works out in tha long run......

[Dave Strong]

a "touch" of anti-seize on stainless bolts ALWAYS works out in tha long run......

And NO air tools.

Dave

[Ted Stryker]

All good info, proving advice.. I use 1/2"x20 stainless with stainless nyloks but I use anti-seize.. I put the nut in the inside of the transom in case I need to ever re-torque, I won't lose my water tight seal long as I keep the bolt from turning.. I have used grade8 fasteners but I sure wouldn't recommend it in salt..
And don't over torque, use big thick washers

[Slimm]

I bought all new stainless steel bolts, nuts and washers when I re-powered my boat. I then learned that stainless steel hardware was grade 5, shortly before bolting everything up I saw a couple videos of engines coming loose from the transom due to broken bolts or nuts coming loose. I chose to buy everything in grade 8 since I am not in saltwater and used anti-seize liberally when bolting everything up and again whenever I changed jackplates or added wedges etc.. I am sure some folks do theirs differently but after seeing those engines flopping around the boats with props spinning, I knew real quick I didn't want that thing in the boat with me.

Slimm

[powerabout]

I thought those OMC V8 bolts are equivalent to grade 8 steel?

[Euroski]

From memory it's 60ft/lbs torque

[vnemous]

No anti size in salt water JMO

[Dave Strong]

From memory it's 60ft/lbs torque

30 lb/ft.

Dave

[pyro]

Awesome. I will see what lengths I need, and order the Mercury kit.

Currently, there are NOT any washers on the motor side at all, just nylock nuts.

[powerabout]

I wonder if 400 verado uses the same bolts?