For our veterinary reusable needles, the hub is made of copper, the cannula is made of stainless steel #304, why don’t to use hub made of stainless steel? the reason is that: comparing the stainless steel hub, the firmness of the copper hub is better, besides, the riveting stregth of the copper hub is more stronger. so the copper hub is better than the stainless steel hub. and more suitable for repeated use. but the copper hub is more expensive.
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