David Jenkins
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| posted on 7/5/09 at 10:43 AM |
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Today's question - locking a bolt.
1. I plan to use an M8 bolt/screw to hold something securely.
2. What it's holding does not rotate, but it will get a lot of vibration and sideways shocks, although only at a low level.
3. The bolt, and what it screws into, are both stainless steel so I will need to grease the threads to ensure that they don't bind.
4. I will need to undo the bolt occasionally, quite possibly in difficult circumstances (e.g. on the side of the road, in pouring rain).
Number 4 means that normal threadlock is out of the question (unless you can get 'soft grip' types).
I don't like (or trust) spring washers.
The ideal solution would be a Nylok bolt (they have a nylon insert in the thread, near the tip) but I've never seen those on sale in the UK.
Any other bright ideas?
(The forum's track record for suggesting options I hadn't thought of - or didn't even know about - has been very good so far... how
about this one?  )
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Steve Hignett
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| posted on 7/5/09 at 10:45 AM |
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You CAN get different grades of threadlock, so there's one answer for you, but I've not anything to do with Nylock bolts I'm
afraid!
ATB
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sickbag
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| posted on 7/5/09 at 10:47 AM |
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How about drilling a hole near the end of the bolt then inserting a 'R' clip. They're easy to remove by hand but shouldn't
come out in service.
Finally back on the job!
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blakep82
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| posted on 7/5/09 at 10:47 AM |
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can you get to both ends of the bolt? what about drilling a hole through the end of the bot and put an R clip through?
ha ha i'd have got in with that one first if i didn't look for a picture
[Edited on 7/5/09 by blakep82]
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Howlor
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| posted on 7/5/09 at 10:51 AM |
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Or if you can't get to the other end can you still put a hole through the bolt head and an R Clip but into a hole on the chassis to stop it
rotating?
Steve
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sickbag
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| posted on 7/5/09 at 10:54 AM |
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quote:
Originally posted by blakep82
can you get to both ends of the bolt? what about drilling a hole through the end of the bot and put an R clip through?
ha ha i'd have got in with that one first if i didn't look for a picture
[Edited on 7/5/09 by blakep82]
That's the quickest I've been outside of the bedroom! 
Finally back on the job!
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Howlor
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| posted on 7/5/09 at 10:55 AM |
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Norlock fittings I have seen used and seem to work very well.
Steve
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chrsgrain
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| posted on 7/5/09 at 11:00 AM |
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Drill a hole through the bolt head and wire it to something close by?
Chris
Spoing! - the sound of an irony meter breaking...
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tomgregory2000
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| posted on 7/5/09 at 11:00 AM |
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quote:
Originally posted by Howlor
Norlock fittings I have seen used and seem to work very well.
Steve
These are amazing
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nick205
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| posted on 7/5/09 at 11:05 AM |
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David - I'm still intrigued as to what you're up to....?
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David Jenkins
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| posted on 7/5/09 at 11:08 AM |
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Cor! Quick answers!
The bolt will only have its head showing - no room to put an R-clip anywhere. It would also be vulnerable to pillocks who like to undo things... 
I don't want to be playing with wired bolts in difficult circumstances!
Those Norlock things look interesting, but would they tend to carve up the metal they're fastening over time? (stainless don't really have
a very tough surface).
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David Jenkins
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| posted on 7/5/09 at 11:09 AM |
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quote:
Originally posted by nick205
David - I'm still intrigued as to what you're up to....?
I'm keeping quiet 'cos some people will probably hate it... not that I care if it fixes what I hope it will fix...
Also, if it doesn't work as well as I'd like, I can abandon it without comment.
There - that's mystified you even more!
[Edited on 7/5/09 by David Jenkins]
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tegwin
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| posted on 7/5/09 at 11:15 AM |
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Wouldnt the simplest solution be to wind a nylock onto the bolt....
Then screw the bolt into your "part".... then simply tighten the nylock down onto the "part" to lock the bolt inplace..
Its done everywhere else... so dont see why it wont work on yours!
------------------------------------------------------------------------------------------------------------------------
Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
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MakeEverything
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| posted on 7/5/09 at 11:16 AM |
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Weld a nut one end, and use a lock tab washer?
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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David Jenkins
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| posted on 7/5/09 at 11:22 AM |
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quote:
Originally posted by tegwin
Wouldnt the simplest solution be to wind a nylock onto the bolt....
Then screw the bolt into your "part".... then simply tighten the nylock down onto the "part" to lock the bolt inplace..
Its done everywhere else... so dont see why it wont work on yours!
A bit of info I forgot to include in the original posting:
I don't want any bits sticking out to catch pedestrians, etc. Not that I've got to pass SVA/IVA, but it does seem the decent thing to
do!
The head of the bolt (either hex or socket cap-head) will be recessed.
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MakeEverything
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| posted on 7/5/09 at 11:29 AM |
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quote:
I don't want any bits sticking out to catch pedestrians, etc. Not that I've got to pass SVA/IVA, but it does seem the decent thing to
do!
Depends where you drive!!! 
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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907
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| posted on 7/5/09 at 11:34 AM |
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Hi David
PTFE tape on the thread.
It will also save using an anti seize paste.
Trust me. I'm a welder.
Paul G
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David Jenkins
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| posted on 7/5/09 at 11:35 AM |
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And it depends on what sort of sticking out bits you're talking about!
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David Jenkins
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| posted on 7/5/09 at 11:36 AM |
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Paul - cheers - I'll give that a try... 
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craig1410
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| posted on 7/5/09 at 12:06 PM |
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Must say, I'd just use a spring washer - is there a reason why you don't trust them?
There are a number of types of spring washer - I tend to use the single split type in most cases, especially for high torque applications but I use
the "frilly" type for lower torque applications. Never had any problems with them coming loose.
Cheers,
Craig.
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iank
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| posted on 7/5/09 at 01:00 PM |
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I've seen caliper bolts with the nylon coating, maybe there's an OEM bolt that would work.
Here's a really wacky one used on Mini's (metric bolt shank with unf thread )
http://www.minispares.com/Product.aspx?ty=pb&pid=35377&title=CALIPER%20BOLT%20FOR%20TURBO%20CA...
Personally I'd go looking for loctite 222 or 243
http://www.eriks.co.uk/threadlock/eriks.asp?title=Threadlock-Adhesive&pageid=861
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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oldtimer
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| posted on 7/5/09 at 02:11 PM |
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Nut and lock nut?
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efiniste
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| posted on 7/5/09 at 02:16 PM |
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Another vote for Nord-Lock here. Never had a problem with them coming loose or chewing up bolts. Fantastic product.
Steve
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blakep82
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| posted on 7/5/09 at 02:19 PM |
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drop of nail varnish on the bolt
acts like nyloc nuts, but you can put a tiny tiny drop on
or even a drop of superglue if you can't find the colour of nail varnish you're after
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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UncleFista
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| posted on 7/5/09 at 04:59 PM |
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Not possible to use a stud with a nyloc on it instead of a bolt ?
Tony Bond / UncleFista
Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night the ice-weasels come...
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