The US is one of the only countries using the Imperial SAE sizing system for nuts, bolts, screws, washers, etc. The rest of the world uses the metric system. Metric sizes should be abundant and CHEAP! I found otherwise looking for exact types & sizes for an import auto restoration project. I also learned the hard way about hardness grading.
JLC-80KW Metal Bar End Heating Induction Forging Furnace, widely used for bolts and nuts hot forging with high efficiency and much energy saving.
Email: candy@jinlaiem.com
Skype: candy.wang56
Mobile: +86-15899607821 (wechat, viber, whatsapp)
Website: www.inductionchina.com