CMB Stage-4 experiments will reduce the uncertainties on the gravitational lensing potential by an order of magnitude compared to current measurements , and will also produce a Sunyaev-Zel ’ dovich ( SZ ) cluster catalog containing \sim 10 ^ { 5 } objects , two orders of magnitudes higher than what is currently available . In this paper we propose to combine these two observables and show that it is possible to calibrate the masses of the full Stage-4 cluster catalog internally owing to the high signal to noise measurement of the CMB lensing convergence field . We find that a CMB Stage-4 experiment will constrain the hydrostatic bias parameter to sub-percent accuracy . We also show constraints on a non parametric Y - M relationship which could be used to study its evolution with mass and redshift . Finally we present a joint likelihood for thermal SZ ( tSZ ) flux and mass measurements , and show that it could lead to a \sim 5 \sigma detection of the lower limit on the sum of the neutrino masses in the normal hierarchy ( \sum m _ { \nu } = 60 \textrm { meV } ) once combined with measurements of the primordial CMB and CMB lensing power spectra .