Various needle gauges, lengths, and hub material was tested under static loading conditions. Significant differences exist in the needle industry in terms of strength and failure rate. Needle breakage was found to occur only when a bent needle was straightened and then reused. Manufacturing differences were found especially in the bond that joins the needle/hub assembly resulting in significant differences in failure rate
Iowa State University
Hoff, Steven J., "Strength Characteristics of Swine Injection Devices" (1997). Swine Research Report, 1996. 30.