ASTM specification for inconel bolt 2

[ivancberni]

How can I find the ASTM specification for a fine thread 12 PT HEX BOLT 3/4-16 UNJF - 3A X 2.300 INCONEL 718?

specifically the torque setting...

I have tried looking online with no luck...

 

[boo1]

Material specification:
ASTM A1014 / A1014M - 10 Standard Specification for Precipitation-Hardening Bolting (UNS N07718) for High Temperature Service

http://www.astm.org/Standards/A1014.htm

 

[TVP]

ivancberni,

As boo1 mentioned, ASTM A 1014 is a suitable standard for alloy 718 bolts. However, it does not have any information related to the assembly process, meaning torque-tension behavior, what tightening torque to use, etc. This depends on a number of factors including joint details, coatings and/or lubricants, and what preload is required to clamp the joint.

 

[ivancberni]

Thank you guys, I used the ASTM 1014 to find the yield strength of inconel 718.

with this value I found a preload by multipling the yield strength with the tensile strength area.

Then I used the torque equation T=K*D*P
K= coefficient of friction(which varies with coating/lubricant used)
D=bolt diameter(3/4in)
P=Preload

I was hoping to find an actual tandard for this torque equation but never found it.

Nevertheless, Thank you for your replies!

 

[grimmy65]

There is no official American standard for this equation but this is the widely accepted industry standard. My colleagues and myself typically reference Shigley.