2 piece rotors and safety wire....

So I purchased this brake kit for the Miata:

http://wilwood.com/BrakeKits/BrakeKitsProdFront.aspx?itemno=140-11704&year=2005&make=Mazda&model=MX-5+Miata&option=w/+Sports+Suspension

The kit came with button head hex screws to attach the rotor to the hat, nope. Not going to use that.

Can anyone point me in the direction of high quality fasteners that are already pre-drilled for safety wire? I don't have the tools or desire to find screws and drill them myself.

Looking at the PDF catalog (pg 75), ARP sells rotor hat fasteners pre-drilled for safety wiring.

McMaster Carr has pre-drilled fasteners for safety wire as well.

http://www.mcmaster.com/#standard-cap-screws/=o8cuc2

If the bolts that attach the hat to the rotor are flush with the hat surface, once the wheel is installed wouldn't it be impossible for them to back out? Also, how would you install the wheel with safety wire sandwiched between?

Armitage wrote: If the bolts that attach the hat to the rotor are flush with the hat surface, once the wheel is installed wouldn't it be impossible for them to back out? Also, how would you install the wheel with safety wire sandwiched between?

The screws come in from the backside, if you click the link and scroll down just a bit you can see that.

Armitage wrote: If the bolts that attach the hat to the rotor are flush with the hat surface, once the wheel is installed wouldn't it be impossible for them to back out? Also, how would you install the wheel with safety wire sandwiched between?

Please go look at how separate rotors and rotor hats are assembled.... it varies a bit depending on design, but the rotor hat bolts are nowhere near the wheel.

Ian and 93Civic, thanks gents. I will go check that out. Need to call Wilwood and double check the specs on the screws.

I looked up on the site, but the bolt kit part no comes up as obsolete, so I don't want to trust it.

I used aircraft bolts for my rotor-to-hat junctions, which are all available pre-drilled. Not cheap, but you can get 'em here:

http://www.coastfab.com/hardware.html

are you allowed to use lock wire washers where you race?

http://www.powersportsplace.com/parts/ptm-pp2765?seid=pspse1&gclid=CM-3usXIm7kCFYWe4AodQn4Aig

personally, I miss drilling 1/16" holes 3/4 of the way through a harden bolt only to have the bit snap off in the hole. Good times...

codrus wrote: I used aircraft bolts for my rotor-to-hat junctions, which are all available pre-drilled. Not cheap, but you can get 'em here: http://www.coastfab.com/hardware.html

WHere in there specifically? I hate crummy web sites.

I don't mind paying for quality.........these are kind of an important interface.

Aircraft Spruce has a good availability of AN and NAS (shear-only) hardware, that's where we got all our stuff for Formula SAE.

z31maniac wrote:

codrus wrote: I used aircraft bolts for my rotor-to-hat junctions, which are all available pre-drilled. Not cheap, but you can get 'em here: http://www.coastfab.com/hardware.html

WHere in there specifically? I hate crummy web sites. I don't mind paying for quality.........these are kind of an important interface.

Why not hit the Contact Us button and call them up? It isn't unexpected that they would not have "2005 Mazda Miata Wilwood rotor-to-hat junction safety wire pre-drilled bolt kit" listed on their site.

.

z31maniac wrote: WHere in there specifically? I hate crummy web sites.

'online store' on the left, then 'bolts'. You'll need to hit the 'technical information' link at the top to get the data sheet PDFs on the various bolt series and figure out exactly which part numbers you want.

Yeah, it's not Amazon.com, but the web site is better than many I've seen. :)

want to make it easy? Call Wilwood. I know that they used to supply drilled hardware for those kits. If it's not part 230-12176, ask what the drilled equivalent is.

Keith Tanner wrote: want to make it easy? Call Wilwood. I know that they used to supply drilled hardware for those kits. If it's not part 230-12176, ask what the drilled equivalent is.

Very true. WHen I posted this yesterday it was 6am California time.

Just spoke with Wilwood. Their position is that the new bolts have a higher torque rating of 25ft-lbs and the use of Red Loctite 271 negates the need for safety wire.

That doesn't work for me, so I'll be buying the ARP studs, 300-0802. Unfortunately it's a 32 piece kit, and I only need 12.

I've read about Resbond, anyone have an idea of the appropriate compound?

If I may ask, why are you so adverse to using the fasteners supplied by wilwood?

benzbaronDaryn wrote: If I may ask, why are you so adverse to using the fasteners supplied by wilwood?

Because I believe in safety wire on safety critical parts. In this case, the very small screws that hold together the brakes that will go on the car.

The intense thermal range the bolts will see (they attach the rotor to the hat) means there will a natural tendency to loosen. Safety wire provides an extra layer of safety over proper assembly and Loctite.

Try and use Loctite 272 instead of 271. Its rated at 450 deg F vs 300 deg F for 271.

You can also use Loctite 2620 ( rated to 650 deg F) but its used on larger bolts and its a paste.