Reply To: Materials strength question

[Roy Hughes]

James,
Typing “how much weight can an m4 bolt hold” into Google gave…
“An M4 bolt’s weight-bearing capacity depends on several factors, including its grade, the material it’s made of, and the type of load it’s subjected to (tensile or shear). However, a general estimate for a common grade 8.8 M4 bolt is around 300 kg (661 lbs) in tension and potentially 150 kg (330 lbs) in shear. This assumes the bolt is properly tightened and not subjected to excessive vibration or impact.”
from the AI (always suspect, may have the figures the wrong way round!).
But if the material you are bolting into is aluminium that would fail in tension/pull out well before that.
Not a lot of use I’m afraid – everything else is above my brain grade.
Roy.