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28-07-2004, 01:43 AM
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#1
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Registered User
Country: Wales
Location: Southampton
Occupation: boat driver/Instructor
Interests: boats , laughing and music
Boat name: Dyna Mo Humm
Boat make: Avon Searider 8.4mmmm
Engines: Cat 4216 450hp
Cruising area: Solent
Join Date: Mar 2004
Location: Southampton
Posts: 983
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what type of bolts
I have just returned from a very confusing visit to the Bolt shop.
I wanted to buy some High tensile bolts to connect Billys drive plate to the propshaft, cos he's nearly fkkn ready for a little swim.
The man in the shop told me I needed 316 stainless for that job and I said no i don't I want high tensile bolts cos Stainless is brittle after a while.
Is stainless steel also high tensile
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when I grow up I wanna be Tony Davis
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28-07-2004, 08:48 AM
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#2
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Registered User
Join Date: Mar 2004
Posts: 1,016
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Can only help with US specs.. but here's my two pence worth..
When we want high tensile bolting for moderate temperature use we specify B7 grade which is CrMo and has a ultimate tensile of 860Mpa
B8M (316) can be "upped" to 760Mpa (UT) if you specify class2...
Kinda means that you can buy "higher strength" S/steel bolting if you can find a supplier....
Just as a matter of interest, B8 (304) is actually "stronger" than B8M(316).....Oh? and if they're strain hardened studs will invariably be "stronger" than bolts...
Now you should be really confused.... .. Just ask the FGT for his advice..... he is the font of all knowledge.......
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28-07-2004, 09:18 AM
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#3
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Re: what type of bolts
Quote:
Originally posted by rowg waiv
I have just returned from a very confusing visit to the Bolt shop.
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At 1.43 am! so the shops either in Scotland, or its a 24 hour bolt shop!...Cool! if the later, I need their number.
My £0.02 worth, which is probably only worth £0.01 is, You've made the correct choice with High tensile, and use a decent (Perect seal) thread sealer/anti corrosion agent.
s/s is nice and indeed nessasary when imersed, but this application is in my opinion, is definately high tensile territory.
IMHO
PS. If we're talking bolts AND nuts, use fine thread, ie, UNF, and nylock nuts.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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28-07-2004, 09:28 AM
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#4
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Registered User
Join Date: Mar 2004
Posts: 1,016
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..and another thought.. is the fastening going into aluminium alloy?........
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28-07-2004, 09:31 AM
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#5
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Quicksilver Perfect seal'! superb jollop
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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28-07-2004, 10:08 AM
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#6
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Registered User
Join Date: Mar 2004
Posts: 1,016
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Quote:
Originally posted by Johnson
Quicksilver Perfect seal'! superb jollop
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How does that work then? Does it completely insulate the mating surfaces (thread and clamping face) ? What sort of effect does it have on torque setting?.... and is it cheap?
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28-07-2004, 11:15 PM
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#7
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Registered User
Country: Wales
Location: Southampton
Occupation: boat driver/Instructor
Interests: boats , laughing and music
Boat name: Dyna Mo Humm
Boat make: Avon Searider 8.4mmmm
Engines: Cat 4216 450hp
Cruising area: Solent
Join Date: Mar 2004
Location: Southampton
Posts: 983
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Thanks guys
Guess what Billy's been doing today?
24 hour boatshop wpould be good, but I guess Screwfix comes in as close as could be to that.
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when I grow up I wanna be Tony Davis
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28-07-2004, 11:44 PM
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#8
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Registered User
Location: The Pit
Join Date: Mar 2004
Location: The Pit
Posts: 1,324
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Billy's Out.
Unbelievable!!!
Great news.
Missus
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28-07-2004, 11:57 PM
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#9
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Registered User
Location: The Pit
Join Date: Mar 2004
Location: The Pit
Posts: 1,324
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bravo, bravo
Missus
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29-07-2004, 12:00 AM
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#10
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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"Perfect seal" is a very sticky, viscous jointing compound that I really believe in. It works extremely well for mating surfaces and bolt threads alike, in time, it dries to a wax like texture and seems to 'stay put' like no other stuff. A good example is the head bolts of a big block chevy, the threaded holes into which the head bolts locate, are not blind, instead they are open at the bottom to the engine waterways, as most engines of this type are raw water cooled, that is, sea water is passed around the engine block cooling system, corrosion is a major issue, especialy when salt water creeps up the threads of the head bolts doing all manner of damage.
Using perfect seal on the head bolt threads seems to totaly stop any water making it up the threads, often, when removing the bolts, you can clearly see where the end of the bolt (last few threads) where sticking into the water way, the thread has been comletely eaten away, leaving little more than a stump, but the bolt, when removed, still unwinds with a nice guey feel, and the portion where the PS has been trapped within the threads is 'as new'.
It's marketed by Mercury marine as "Quicksilver Perfect seal" and is quite pricey, but the exact same stuff, in an identical tin, with the same lid complete with aplication brush, marketed by OMC is a quarter of the price.
I use it pretty much everywhere on the boat to lube/seal threads.
I guess in theory, you would need less torque loading using such a viscous thread lube, but I've never made any such changes.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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29-07-2004, 12:34 AM
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#11
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Registered User
Country: Wales
Location: Southampton
Occupation: boat driver/Instructor
Interests: boats , laughing and music
Boat name: Dyna Mo Humm
Boat make: Avon Searider 8.4mmmm
Engines: Cat 4216 450hp
Cruising area: Solent
Join Date: Mar 2004
Location: Southampton
Posts: 983
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I'll have some of that Anyone know of an OMC dealer in sarfampton
__________________
when I grow up I wanna be Tony Davis
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29-07-2004, 12:45 AM
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#12
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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I'll have a look see at the product name as "OMC"
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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