Female syringe barrel, syringe kit, and syringe connection method

A syringe kit comprising:

• a male syringe having a male syringe barrel that includes a nozzle configured as a male luer, a lock adapter which surrounds an outer circumferential surface of the nozzle and has a screw on an inner circumferential surface of the lock adapter, and a male barrel body connected to the nozzle and the lock adapter;
• a female syringe having a female syringe barrel that includes a cylindrical portion configured as a female luer to which the nozzle is connectable, two protrusions which protrude from an outer circumferential surface of the cylindrical portion and are engageable with the screw of the lock adapter, and a female barrel body connected to the cylindrical portion;
• each of the two protrusions has an inclined surface;
• when the screw and the two protrusions are engaged, the two protrusions which each have the inclined surface are configured to advance over a screw thread of the lock adapter by a torque smaller than a torque at which the female syringe breaks when the female syringe is engaged with a convex reference conical fitting for a stress crack test specified in ISO 594-2;
• and
• wherein the two protrusions each have a chamfered corner chamfered on a side opposing the inclined surface.