|If customers ask for other hex, thred or length, and the quantity is profitable, we can produce.|
This information is applicable to following articles:
High Voltage Insulator MI, Polystyrol HEX knob IS and Polystyrol HEX knob ISS, ISK, ISD
|recommended values - indicative only|
|Bolt size||Grade 4,8|
|Recommended max. tightening torque in Nm for untreated oil-smeared screws.
Friction coefficient µ=0.125, torque corresponds to approx. 62% of tensile bolt stress.
Friction coefficient µ=0.14, torque corresponds to approx. 90% of tensile bolt stress.
Every bolted joint is unique and the optimum tightening torque should be determined for each application by careful examination. A properly tightened bolt is one that is stretched such that it acts like a very ridged spring pulling mating surfaces together. The rotation of a bolt (torque) at some point causes it to stretch (tension).
Several factors affect how much tension occurs when a given amount of tightening torque is applied.