Luer taper

The Luer taper is a standardized system of small-scale fluid fittings used for making leak-free connections between a male-taper fitting and its mating female part on medical and laboratory instruments, including hypodermic syringe tips and needles or stopcocks and needles.

It originated as a 6% taper fitting for glass bottle stoppers (so one side is 1.72 degrees from the centerline).

Key features of Luer taper connectors are defined in the ISO 80369-7 standards.

Slip tip (Luer-slip) fittings simply conform to Luer taper dimensions and are pressed together and held by friction (they have no threads).

Record connector, older standard for non-needle small diameter connections in Europe.

A syringe with a male luer lock fitting, and a needle with female luer lock fitting (purple) which screws into it