XQ Fastener is dedicated in manufacturing high strength fasteners for 28 years. We have got API 20E Certificate since 2014 and exported BSL-1, BSL-2 and BSL-3 products to USA, UAE, KSA, Mexico and other countries. We also have API 20F Certificate. Full thread, tap end and double end studs with assembled nuts are our main products. Welcome to visit us for more details.