Can anyone offer advice regarding stainless bolts - BMW Luxury Touring Community
 
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post #1 of 8 Old Nov 4th, 2012, 11:13 am Thread Starter
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Question Can anyone offer advice regarding stainless bolts

Hi I have the caliper bolts on my K1300GT rusting and also the bolts on the fuel cap.
I have asked my BMW dealer if he has stainless replacements and he tells me that they react against the thread metal and seize. is this true ???????????.
Thanks Brian
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post #2 of 8 Old Nov 4th, 2012, 4:01 pm
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Re: Can anyone offer advice regarding stainless bolts

He's probably telling you the truth. The aluminum caliper housing would not go well with the stainless. Corrosion is a big problem with aluminum and the stainless would probably set up a small current where the two meet. If you want to give it a try, use anti-seize compound or a heavy dose of medium grade thread locker on the threads. If you use anti-seize, keep a close eye on it. You might even consider drilling the hex and safety wiring it.


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post #3 of 8 Old Nov 4th, 2012, 4:09 pm
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Re: Can anyone offer advice regarding stainless bolts

Also, do not use thread locker on the filler bolts. If I recall correctly the anchors are set in plastic and the added torque would very likely destroy them, not to mention the damage the thread locker will do to the plastic where it makes contact.


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post #4 of 8 Old Nov 4th, 2012, 5:15 pm
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Re: Can anyone offer advice regarding stainless bolts

I think your dealer is blowing smoke. I've seen stainless react with salt water and human waste. If I were you, I'd take one each down to the hardware store and match them with stainless bolts. It is standard practice to use stainless bolts with aluminum. Dean Woolsey is extremely knowledgeable and is one of my go to guys for info. Just saying I've used stainless and aluminum together with no ill effects. Common practice also dictates using anti-seize lubricant with aluminum.

Last edited by seahabit; Nov 4th, 2012 at 5:22 pm.
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post #5 of 8 Old Nov 4th, 2012, 6:22 pm
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Re: Can anyone offer advice regarding stainless bolts

You can thread stainless directly into threaded aluminum, but it can also cause problems. When my semiconductor engineers design threads in aluminum, there are always Heli-coils used. That avoids any corrosion or seizure or stripped threads from over-tightening.

The bolts on the fuel cap are already stainless. They go into threaded brass inserts in the plastic fuel tank, so it's not a problem unless you really crank on them.

Ken
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post #6 of 8 Old Nov 4th, 2012, 6:31 pm
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Re: Can anyone offer advice regarding stainless bolts

I replaced the fork pinch bolts on my first LT with stainless bolts. I ended up drilling out the stainless bolts due to them being seized....it took several hours and drill bits and a few broken EZ-Outs. I learned my lesson the hard way .

Ron


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post #7 of 8 Old Nov 4th, 2012, 8:20 pm
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Re: Can anyone offer advice regarding stainless bolts

Two problems:

1- Stainless fasteners are about 60-70% the strength of the original steel caliper bolts. Stainless is for corrosion resistance only, NOT strength! I would NOT replace any critical high strength steel fastener with stainless. The stainless fasteners on the LT are the fairing screws, which are black coated stainless, and even then almost none are threaded into aluminum.

2- Stainless steel fasteners in threaded aluminum is asking for big problems, high probability of galling and seizing. Then you have a huge problem, drilling out the seized fastener and installing a thread insert.

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post #8 of 8 Old Nov 6th, 2012, 3:26 pm Thread Starter
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Cool Re: Can anyone offer advice regarding stainless bolts

Thanks everyone i will take your advice/experience
Brian
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