Pipetting needles are blunt tip needles that have no point. These are widely used for dispensing of fluids because of their accuracy. Blunt tip needles are commonly used in dispensing adhesives, fluxes, lubricants and sealants. The size of the drop dispensed can be adjusted by the gauge of tubing used. The dispensers that use these can be manual applications where liquids are applied from bottles with male luer lock caps or pressurized or manual syringes. In large production these blunt tip needles are used in conjunction with x–y plotters.
Blunt tip needles are available in a variety of lengths because there are times when the liquid that is being dispensed has to be put in places that cannot be reached by hand. Because the female luer hub on these needles is nickel plated brass and the cannula is stainless. Chemicals that are harmful to plastic hubs will not affect these needles. They are also resistant to higher temperatures.
Typical industries that use blunt tip needles are petrochemical, printing, electronic, and circuit board assembly. Medical applications that commonly use blunt tip needles are chromatography, stem cell, pharmacology and animal research. These needles are used because they will not puncture a surface due to the 90° tip. They are also used to connect micro bore tubing by fitting inside the ID of the tubing. Generally, commercial connectors only go down to 1/16” (0.0625”) connections. With blunt tip needles tubing can be glued with cyanoacrylate adhesives to the ID or the OD of the stainless cannula. This allows tubing with ID’s of 0.005” to be attached to male or female connections.