super glue instead of loctite – will I die?

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  • super glue instead of loctite – will I die?
  • Premier Icon buck53
    Subscriber

    I’ve taken the crankset off my road bike, started to reassemble and cannot find the loctite anywhere. If I use super glue to do circa 10 miles commute tomorrow will it last or will I, as the saying goes, die in a ball of flames?

    Superglue slighty more brittle (%15) but fine ….. I use it with no problems (chartered engineer)

    mtbtomo
    Member

    You what??? πŸ™„

    Loctite is a brand….they make threadlock compounds and also super glue.

    Which bit do you need it for? I don’t use threadlock on any cranksets, I just make sure they’re nipped up tight. I wouldn’t use superglue though, regardless. I get the feeling it wouldn’t be that effective either as a glue or a threadlock in this application.

    It won’t come loose in 10 miles without threadlock. So I wouldn’t worry about it.

    chvck
    Member

    Could just use no loctite, that’s what I do with no problem (software engineer ;))

    mtbtomo
    Member

    Can I add “Charted Engineer” to my post too? (Seriously)

    However, I did cop out of the welding and adhesives module at uni all those years ago 😳

    IanMunro
    Member

    I assumed he was talking about not having any 609 for the bearings.

    Premier Icon nicholas_yiu
    Subscriber

    Superglue will be fine temporarily but it deteriorates when it comes in contact with water.

    However, as said above, no threadlock is fine. If the correct torque is applied and thread condition is ok so that it achieve designed bolt tension, it will never come loose.

    nonk
    Member

    Is this why so many engineers walk into bike shops announce that they are engineers and that anything you say Is probably just a load of toss then proceed to show you how they have feked the job .
    Super glue πŸ™„ πŸ™‚

    Ok you could try loctite 601 bearing retaining compound – but honestly, I build tanks, uav’s and silly stuff for the queens army and loctite 401,405,601 & superglue (cyanoacrylate) is great

    Premier Icon buck53
    Subscriber

    Thanks all, I was talking about the bolts on non drive side crank, should have said.I’ll torque them up and leave early to be on the safe side

    Nonk you are a tool πŸ™‚

    nonk
    Member

    πŸ˜†
    And an engineer as it happens πŸ™‚

    drlex
    Member

    […]superglue (cyanoacrylate) is great

    Agreed – I’ve just glued my thumb back together (deliberately) with it.

    Yeah right πŸ™‚

    boblo
    Member

    Wonder why Shimano just give torque values and no ‘threadlock here’ directions in their tech docs….? πŸ™„

    I assume the Chartered Eng up there ^ is a Civil Eng πŸ™‚

    legend
    Member

    nonk – Member
    Is this why so many engineers walk into bike shops announce that they are engineers and that anything you say Is probably just a load of toss then proceed to show you how they have feked the job .

    Only Software Engineers πŸ˜‰

    nonk
    Member

    No I am honest πŸ˜€
    Served some of my time at vickers in fact
    My career never took off though πŸ˜†

    Ha πŸ™‚ idiots all of you – all I can say is in afghan we used superglue all the time – it’s fine trust me.

    boblo
    Member

    As a Vicar maybe…. πŸ˜†

    <edit> Cyano in Afghan? For its original purpose mebbies… πŸ˜₯

    Qinetiq, BAE & 8 years in REME here

    legend
    Member

    doncorleoni – Member
    Ha idiots all of you – all I can say is in afghan we used superglue all the time – it’s fine trust me.

    Is that the kit we get in for repair then?

    Legend – what kit ? The UTD?

    Premier Icon buck53
    Subscriber

    Buck53 – bringing engineers together since 1983. πŸ˜‰

    Lets go back to the original op’s question – yea superglue is absolutely fine to use instead of threadlock I assure you.

    So which is the best loctite to use on a bike? 222?

    Personally 243 for me due to tolerance to oil and other stuff

    Premier Icon scaredypants
    Subscriber

    blutack FTW

    (social engineer)

    Premier Icon roverpig
    Subscriber

    In nearly 40 years of riding and maintaining bikes I’ve never even owned a tube of thread lock. But then I’m not an engineer πŸ™‚ I find that the biggest problem on a bike is making sure the damn bolts can be undone again when you want them to be.

    Rob Hilton
    Member

    What’s wrong with a dab of grease like us unqualified commoners use?

    Rob (5 GCSEs)

    Premier Icon aracer
    Member

    Served some of my time at vickers in fact
    My career never took off though

    Did it submerge instead?

    Neil F
    Member

    Will Superglue actually set on steel or aluminium?
    (non-engineer) πŸ˜€

    nikk
    Member

    What kind of crank is it anyway? Without that information, surely we are pissing in the wind? (sound engineer)

    legend
    Member

    Get some anti-tracking varnish on too just to be safe

    Don, whatever kit we make and the squaddies break!

    Premier Icon aracer
    Member

    What’s wrong with a dab of grease like us unqualified commoners use?

    I’ll have you know I also just use grease*, and I’m a software engineer.

    *except on the Campag UT cranks on my roadie, where after struggling long and hard with my principles I used Loctite as directed in the instructions.

    nonk
    Member

    Nothing rob cos its your bike and you look after it so it will be reet
    But if you are preping something for someone else you want to make sure it will do what it’s supposed to with out being looked after.

    The op is worrying about nowt really as he clearly fettles his own bike so it will probably get checked long before it ever comes loose .

    Premier Icon nicholas_yiu
    Subscriber

    No one seem to take my comments seriously, I use to be an engineer specialised in threaded fasteners. (now middle management with a Orange 5 of course) I have a Master Degree in Mechanical Engineering and spent 4 years working out torques on critical bolts on engines. πŸ˜†

    Back on topic:

    For general bike maintenance, you should take notice of the following:

    Thread lock is only useful if you haven’t torque your bolts up properly.

    Remember, it’s clamping force that keeps your parts together, torque does not equal to clamping force

    If you are experienced, a calibrated elbow is usually better than a torque wrench as torques are very low on bikes and you can very easily miss the click and end up damaging your components.

    Always clean the thread before doing it back up. Ensure there is no thin oil on the thread and tighten to the specified torque. If the thread is dirty, even if it reach the specified torque, the clamping force will be low and it might come loose. If the thread is oily, it will be over tightened and damage your components.

    A trick is to use copper slip. It’s been experimentally proven that copper slip will return the thread friction coefficient very close to fresh threads. This is where the joint is designed to achieve the correct clamping force after tightening to the correct torque.

    Thanks for reading.

    andyl
    Member

    I don’t use copper slip on my bike (and some parts on my car) but I do use plenty on general car bolts. I do use ceramic based anti-seize that is safe for plastics and rubbers on the bike and some car areas.

    As for superglue it will be fine but only use a tiny dab znd it will break away easily. But leaving remnants of dried broken glue on threads is not ideal for next time and should be cleaned off. Chances are it won’t stick well anyway due to grease as shimano do put their lovely green grease in the crank bolt holes (I need to find who makes that grease as it is very good).

    BUT you MUST make sure that the bolts are tight enough to begin with (ie torqued up correct) as it won’t matter if your bolts are secure if they are not providing sufficient clamping force and the crank is fretting away on the splines.

    Premier Icon Cheezpleez
    Subscriber

    I use Marmite. The special XO stuff.

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