arp head studs on ebay
 

i wish would have waited to buy my studs some one will be a good deal there are 24 valve studs

i think thats a good deal iam i wrong

$100 is a very good deal but the auction has a long way to go
http://cgi.ebay.com/ebaymotors/ws/eB...category=33617

Used fasteners that are for critical missions like head gasket sealing are not the best thing to buy.

Many people overtorque the ARP's and permanently stretch the material. This reduces the fasteners ductility and makes them have reduced clamping ability.

Don~

the yeild on a chromolly bolt like those arp they have a large tension strenght. i call arp and they said to ask what they torgued them to if over 125 they might strecth a little, but give them a call with the lenghts of the studs they will tel you whats up ( sorry no chimmed in for a while so i checked into it for a friend)

The ARP studs are not chrome moly. They are a stainless alloy. 75% yeild on them is 96 ft lbs. Making 122 ft lbs 100% yeild. 125 is stretching them, but many have gotten away with it so far. 125 with a torque wrench out of spec could put enough into them to stretch them too far.



Don~

well i'll be fooled that sales rep named max at arp must be a liar. Here the number i dailed 1-805-339-22200 maybe you should call and tell the factory what they are made out of

Well the salesman at the dodge dealership told me I was getting a v-10 cummings. Dont put much into what any salesperson says.

Don knows his stuff, you would be wise to listen to him. Especially since IIRC, he helped ARP out with the development of their studs.

I'm not sure what these studs are made of, but I can assure you that the tensile strength of a fastener is not always determined by the torque you are applying.
There are too many variables that will increase or decrease the torque and thus affect the amount of tension (clamp) of the joint.
If we were talking about alloy steels then there are calculations to determine what the proper torque to apply to create the proper tension of the joint.
But with Stainless Steel fasteners, it's another story. Stainless reacts differently when it comes to ulitmate tensile, yield, and proof.
Your ideal situation should be this:
You want to bring the fastener into a position that causes the fastener to stretch to create the "ultimate clamp". This is usually between the proof load and the yield strength.
I would contact ARP and ask these questions.
What is the material of these studs?
What do they recommend for proper torque?
When they determined what the ideal torque was, what were they using for lubrication (if any)?
Were they using a washer under the nut? What grade of washer and what grade of nut?
Then try to duplicate their set up.
They may try to side step these questions since they do not want to open their self up to liablity.
But they should be able to give you APPROXIMATE information.
Good Luck

Mike

4rgsp you are very correct and the yeild is also effected by heat treat i work as a areospace machinest and deal with heat treat and different alloys i have two sets of arp studs, a set of a-1 tech, and finally i made a set a inco 718 have not tried it yet but i will on my next motor i build.

i testd rockwell on all these studs if anyone is intersed i have the results some where.

Oh Man. Life is funny sometimes.

Don~

I agree with you Don, Life can be funny. What are you laughing at this time?

speaking of salesmen telling lies i had a salesman tell me that the supercharger thats on my v10 dodge was a stock item .

May I quote you on that Don? :D

brandon.
(BTW, the first set of ARP studs for the 24v cummins seem to be holding fine. I sent in an oil test with the last change just to be sure. http://dieselplace.com/forum/images/smilies/hihi.gif)