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We undertake a covariance error analysis of the pion-nucleon-nucleon couplingconstants from the Granada-2013 np and pp database comprising a total of 6720scattering data below LAB energy of 350 MeV. Assuming a unique pion-nucleoncoupling constant in the One Pion Exchange potential above a boundary radius$r_c=3 {\rm fm}$ we obtain $f^2=0.0763(1)$. The effects of charge symmetrybreaking on the $^3P_0$, $^3P_1$ and $^3P_2$ partial waves are analyzed and wefind $f_{p}^2 = 0.0761(4)$, $f_{0}^2 = 0.0790(9)$ and $f_{c}^2 = 0.0772(6)$with a strong anti-correlation between $f_c^2$ and $f_0^2$. We successfullytest normality for the residuals of the fit. Potential tails in terms ofdifferent boundary radii as well as chiral Two-Pion-Exchange contributions assources of systematic uncertainty are also investigated.

Precise Determination of Charge Dependent Pion-Nucleon-Nucleon Coupling Constants