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[Closed] what size bolt is this?

 jsm
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[#7160044]

I need a new couple of stem bolts, what size is this bolt?

https://www.dropbox.com/sc/ahnp7utblf06jyw/AAAw-lCx4F9c6Y0MmXiyNRRva

Is it m4 * 15mm? what do you call the top - square head?
where can I get some? I assume I want stainless steel? titanium any stronger?


 
Posted : 28/06/2015 5:27 pm
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Socket cap, eBay. Steel stronger than ti. A4 stainless if you don't like rust.


 
Posted : 28/06/2015 5:32 pm
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M5x15mm cap screw
Plenty on ebay


 
Posted : 28/06/2015 5:35 pm
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You could even go aluminium if you wanted as its not load bearing.


 
Posted : 28/06/2015 5:37 pm
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http://m.ebay.co.uk/itm/360835494845?nav=SEARCH&varId=630221129263

As onza says, if there low torque then anodized alloy bolts will be fine
http://m.ebay.co.uk/itm/350977667400?nav=SEARCH&varId=620228774431


 
Posted : 28/06/2015 5:41 pm
 DanW
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You could even go aluminium if you wanted as its not load bearing.

This looks like an M4x15.

The dropbox page refers to it as a stem bolt.

DO NOT use Alu bolts on your stem!

I can only think that people are assuming it is the headset bolt to recommend alu and describe it as non-load bearing


 
Posted : 28/06/2015 6:02 pm
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Agree with Dan. Alu stem bolts are a bad idea IMO. Speaking as someone who uses Alu bolts.


 
Posted : 28/06/2015 6:12 pm
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Sorry, yes I thought we were talking about the seem cap bolt for preloading the headset. The above comments are correct if you mean a stem clamping bolt for pinching the stem down onto the steerer. That is load bearing and is best served with a steel bolt.

Reading it again, you mention a couple of bolts so my earlier helpful post was complete bollocks.


 
Posted : 28/06/2015 6:19 pm
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[url= http://www.volksbolts.com/faq/basics.htm ]An interesting page on fastener strengths here.[/url] Replace fasteners with at least a matching strength


 
Posted : 29/06/2015 6:51 am
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Why?

If your bike comes with a steel headset top cap bolt, or mech cable pinch bolts then you can use alu bolts just fine.


 
Posted : 29/06/2015 7:11 am