Replacing Frame Rivets

[snipescastle2]

Just found some interesting info on "Socket Head Cap screws"

Here's what I found-
"SHCS DO NOT HAVE GRADES ! ( If someone says it is a Grade 8 or 5 , he is full of it !) They meet the ANSI 1962 standards and are forged and rolled formed from quality steel.They do not have a hardness spec, but do have the strength requirement of 176K PSI. A grade 8 bolt only needs a 145K psi Tensile Strength to meet spec, so those who think that a SHCS is a grade 8, are wrong, because a SHCS is far superior. In fact they are 20 % superior.
OK so you now know that SHCS made in the USA are ALL made with superior steel and heat treatment.(probably comparable to a 4140 or 4340 HT steel) and are only available as such."

Taken from this website-

http://bbs.homeshopmachinist.net/thr...question/page3


look at post #23..... good info here.
Ben

[mmiddle]

^^^^ Actually I believe they are 8620 steel. The same thing ARP uses in their fasteners. These are considered "better-than-grade 8".
Also as noted above... Do not use CRS with carbon steel. Big no-no. Its just not safe in the long run.
Additionally, I agree CRS fasteners do not have the yield strength of carbon steel grade 8 or better