Stainless outboard mount bolts

motorpsykler

motorpsykler

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Does anybody know where I can get fine-thread stainless bolts to mount the outboard to the transom. I can only find course-thread stainless bolts. I find that the course-thread bolts jam very easily and break, even with a hand ratchet.
 
5150abf

5150abf

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Aug 12, 2007
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5,808
Re: Stainless outboard mount bolts

Hit them with some teflon spray and it will keep them from locking up, I would think fine thread woudl be even worse since there is more contact between the bolt and nut.

We use the teflon spray at work and run hundreds of bolts a day with few problems.
 
C

Chris1956

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Mar 25, 2004
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Re: Stainless outboard mount bolts

1/2" Fine thread SS bolts are fairly common, I would think. Most any decent HW store should have them. Use SS nylon lock nuts with them.
 
Frank Acampora

Frank Acampora

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Re: Stainless outboard mount bolts

Try a Fastenal near you. If they don't have it, they will order. You also can try Grainger. You can also use brass nuts--they usually don't gall on stainless bolts the way stainless nuts do and are plenty strong for engine mounting.
 
dingbat

dingbat

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Re: Stainless outboard mount bolts

You want course thread and you want 316 SS alloy. Make sure you use anti-seize on the bolts. Stainless on Stainless galls if you look at them funny.
 
D

DJ

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Re: Stainless outboard mount bolts

I bought two today. Coarse thread, with lock nuts. As described above. And, yes, use the anti sieze.
 
motorpsykler

motorpsykler

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Re: Stainless outboard mount bolts

I only figured fine thread more appropriate because that is what I see used on professionally rigged boats. Also, when I worked on helicopters in the Army, we used fine thread stainless bolts, dry and I don't recall ever having a galling issue. It does look like I can get fine thread stainless from Fastenal, just have to figure out the right size. I will use anti-seize, just in case.
 
Cannondale

Cannondale

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Re: Stainless outboard mount bolts

Frank Acampora said:
Try a Fastenal near you. If they don't have it, they will order. You also can try Grainger. You can also use brass nuts--they usually don't gall on stainless bolts the way stainless nuts do and are plenty strong for engine mounting.
Click to expand...



That's the only style of nut my two local boat dealers sell are the brass nuts. Stainless bolts all day long, but brass nuts only.....at least for engine mounting. Both say it solves a lot of seizing/galling problems.
 
C

Chris1956

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Re: Stainless outboard mount bolts

Gee, I am with Motor on this one. I never had any trouble with fine thread SS bolts. Never used anti-sieze on them either.

1/2" fine thread SS bolts are standard for motor mounting. I would think brass nuts would be too soft and cause electrolysis. Maybe those nuts are actually silicon bronze?
 
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