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We need to meet MIL-STD-810G vibration and shock test, for shock, it is 40G at x,y,z and 4 times each axis, 12 in total.

Thanks, we do specify toruques on each screw when tighten them. Thanks.

Thanks Walt, I like this idea.

Material is aluminum AL6101. There are 3 single parts and connected by several M2.5 screws. Each part weight about 150grams Screw will be M2.5 SS. Target shock are 40G at x,y,z. Currently what we do are 1. using loctite on screw 2. using thread insert Any suggestions to ruggidize the design...

Thanks JgKRI

Thanks IRstuff, I am getting there. How about the case that intersection is above the dia. line?

Hi IRstuff, can you explain in more detail?

Thanks. Do you have reference book recommend, or formula I can learn?

I think what I really want to know is, what if the intersection does fall onto the insert length, then what's the assembly strength?

Attached file is an excerpts from HELI-COIL tensile strength of threaded insert assembly. The parent material is Al6061, and bolt strength is 420MPa, in this case, its intersection is below the 1 dia insert length. • If I use 1 Dia insert, what’s the strength of assembly? • If I use 1.5 Dia...