The utility model relates to a side seal hammering oil ninth of ten heavenly stems. The main oily problem that the ninth of the ten heavenly stems easily appears sealing washer damage, piercement phenomenon of current hammering of solving. Its characterized in that: public head (4) outside is arranged in to female head (1), and is equipped with O type sealing washer (2) on the two contact surface, female head (1) outside threaded connection has lock nut (3), public head (4) surface is equipped with the step, the step card and closely cooperates between lock nut (3) and public first (4) on the inside rank trapezoidal surface of lock nut (3). Damaged and the oily piercement phenomenon in the ninth of the ten heavenly stems of sealing washer the ninth of the ten heavenly stems appeared in hammering oil when this side seal hammering oil ninth of ten heavenly stems can avoid the cycle operation to avoid the polluted environment, improve construction quality.