M3 M4 M5 M6 M8 M10 M12 Double End Male Thread Bolt Screw Reducer Fitting Adapter | eBay
M10 to M12 Adaptor - Network Cable and Pipe
Amazon.co.jp: Fittings - 1pc M8 M10 M12 M14 M18 M18 M20 Metric Female to Male Threaded Brass Fitting Adapter Connector for Air Water Home, Factory and More (Size F M12x1.5-M BSP1l4) :