印度采购需求：din6923，六角法兰螺母，带法兰的六角螺母，城堡螺母，高强度，4.8

I'm looking to source a specific product: zinc blue coated flange nuts. We require a total of 16,000 units to meet our production needs. Could you please provide your best pricing, lead time, and any available discounts for bulk orders? Additionally, I'd appreciate details on the specifications, including any relevant certifications and quality assurances. If you have similar alternatives that you think might suit our requirements, feel free to share those options as well. Thank you!