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Old 04-05-2013, 08:15 AM   #1
ShaiDanny OP
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Disc rotor bolts

Hey fellaz,

I have a question regarding the bolts that hold the disc rotors. Stock bolts are called "Special Screw" and are made of 10.9 steel. Their head is solid, unlike the ones that have a T35 torx inside the 8mm hex. Is there a problem using the M6x13 ones that have the torx, also made of 10.9 steel?
Or should I stick with the solid head ones?

Thx
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Old 04-05-2013, 08:52 AM   #2
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I don't know.

I do now your 950 is measuring speed counting the disc screws that pass close to you speedometer sensor. You could try and see if you get normal speed readings with the torx bolts and add your outcome to the OC knowledge.
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Old 04-05-2013, 12:29 PM   #3
ShaiDanny OP
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...the thing is, I already replaced all bolts...
While riding with the gang today, I noticed that all of their bikes are using the solid head bolts, so a red light came on in my brain.
The question is about the strength of the bolts - are the torx bolts in newish KTM's the same as the solid ones used for the brake rotors? Both have a rating of 10.9.
And the speedo reads just fine BTW.

Thx
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Old 04-05-2013, 03:16 PM   #4
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10.9 is 10.9. I see no problem there. Just remember the locktite that goes with them.
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Old 04-05-2013, 03:53 PM   #5
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Also might want to look at the physical bolts.

Since in this application your main interest is in resistance to shear do the stock bolts have a shoulder on them while the other you used are threaded the full length of the shaft.

If that is a case the shouldered bolt would be stronger in the same application.

Worth taking a look at.

This



vs

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Old 04-06-2013, 07:52 AM   #6
ShaiDanny OP
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The stock bolts are threaded the full length as well.
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Old 04-06-2013, 08:35 AM   #7
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You shouldn't have any problem as long as the bolts meet the same spec, 10.9, and everything is functional. Make sure that the new Torx type bolt has the same size head or larger to prevent heirloom cracks in the disks.
Don't skip the Loctite.
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Old 04-06-2013, 09:47 AM   #8
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Quote:
Originally Posted by ShaiDanny View Post
The stock bolts are threaded the full length as well.
Then so long as they are the same material and the head is the same diameter it should be a non issue.

Post up some pics of the two bolts be interesting to see them.
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Old 04-06-2013, 01:42 PM   #9
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Whats the part number of the screws you are using?

Stock 950 front disc screws have a flat top with 10.9 stamped into them
59009062013SPECIAL SCREW M6X13 WS=8 10.9


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