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Old 19 August 2005, 08:52   #21
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aha! Thanks for that. I have just found out the same info. high tensile ss doesn't seem to exist (although one bloke told me it does, but is very rare and expensive). I phoned up a place and they told me that ht carbon steel has the same tensile loading (800Nmm) as the A4 "high STRENGTH" stainless bolts. Also, carbon steel is brittle which means it is less resistant to shear than stainless bolts.

So the conclusion I have drawn is that if I get A4 high strength ss bolts, they will be just as good in tension and even better in shear than the high tensile carbon steel bolts!

I also phoned up tohatsu and they can supply 4 bolts, 4 washers and 4 nuts for just under 50. This is what is normally supplied with an engine.

Tim
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Old 19 August 2005, 08:58   #22
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50 quid is stil 5 X what you need to pay though - id opt for your local steel fastening place - just makle sure its A4 marine grade and your laughing
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Old 19 August 2005, 12:44   #23
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http://www.a2a4.co.uk/acatalog/A2A4_...EADED_428.html

http://www.a2a4.co.uk/acatalog/A2A4_...READED_80.html

I think these guys will have everything you need when it comes to stainless steel bolts - they have UNF and UNC threads aswell if you want to go down that route.

And at just over a 1 each i dought they will be beaten on price
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Old 19 August 2005, 12:46   #24
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Higher strength Stainless bolts have some Titanium in I think, this is why they're so expensive!!
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Old 20 August 2005, 05:19   #25
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Quote:
Originally Posted by roycruse
I think these guys will have everything you need when it comes to stainless steel bolts - they have UNF and UNC threads aswell if you want to go down that route.

And at just over a 1 each i dought they will be beaten on price
Excellent little shop in Shirley, but they wont have what you want! All the M12 they sell is a coarse thread, and you need a fine thread, which is why people talk of "unf"!
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Old 20 August 2005, 05:33   #26
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If anyone has a source of M12 metric fine or UNF 1/2" I would be gratefull!
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Old 20 August 2005, 06:41   #27
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Foulkes & Son (The Barge)
Riverside Yard, Blundells Lane, Bursledon, Southampton, Hampshire SO31 1AA
Tel: 023 8040 6349 Classification: Boats & Smallcraft

http://www.mycartel.co.uk/m/listing.php?id=728109

Boxes of the stuff, full thread and bolts with shoulders, but don't tell everyone

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Old 22 August 2005, 15:34   #28
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Originally Posted by Dirk Diggler
Excellent little shop in Shirley, but they wont have what you want! All the M12 they sell is a coarse thread, and you need a fine thread, which is why people talk of "unf"!
Ok, why do I need fine thread? If its to stop them coming loose, if so, I was going to use nylock nuts. If its for some other reason...what is it? I spose someone might say that the finer thread is stonger because there is more contact area, but is that really the case? There will be more threads, but they are all smaller.

I think I'll probably get the bolts from tohatsu...can't go wrong then

Tim
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Old 22 August 2005, 16:13   #29
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Nylocks are good. Double nuts locked back to back are good too. Have you measured what length bolt you need and what length thread you need? You will need the thickness of the transom + thickness of the engine saddle + nut (and washer) thickness. Also add the thickness of any anti-theft device that you may fit. Then you'll be surprised that many bolt stockists (like A2A4 for example) don't have suitable bolts
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Old 22 August 2005, 22:59   #30
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Dirk really does know his stuff, if he suggests UNF then just go get em I prefer nylocks to backed together nuts but whatever you choose a little splash of loctite would not hurt
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