Based on API certification, we supply bonnet bolts, stud bolts/nuts, and tap end studs (XYLAN coated) for X-MAS TREE, BOP, WELLHEAD, and MANIFOLD applications to North America, the Middle East, Europe, and other global markets. Hwasein Bolt Industry has participated in five major global subsea projects, consistently delivering high-quality fastening solutions that meet the stringent certification standards of global leaders such as SLB and NOV.