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Is equation 9.2.6 in ECSS-E-HB-32-23A correct?

Is equation 9.2.6 in ECSS-E-HB-32-23A correct?

Is equation 9.2.6 in ECSS-E-HB-32-23A correct?

To all stress engineer dealing with ECSS-E-HB-32-23A -Threaded Fastener handbook

I was pointed to ECSS-E-HB-32-23A for the checks of fasteners by the customer. Looking at ECSS-E-HB-32-23A dated 16 April 2010, equation 9.2.6 in section 9.2.3, could anyone confirm if the equation “returns” a Margin of Safety (MoS) or a Reserve Factor (RF)? All MoS equations in the document are written as MoS = X -1 (where X is something being calculated). However eq. 9.2.6 does not have a “-1” in it.

2 possibilities;
1. Equation is correct and therefore one needs to add a 1 to get an RF
2. Equation is not correct and the “-1” is missing


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