"The mechanical properties of the iron-wire clamps and the wire-driving needles have been strengthened…"

If you want an English version with some technical jargon, you could simply say "the iron-wire clamps and the wire-driving needles have been ruggedized…"

I'm not entirely happy with "needles" ("aghi"), but that seems to be the only technical English definition, except possibly for "rods." If "rods" fits your context, by all means use it.