bolt and nut ISO, ASME, DIN, BS, EN galvanized and black carbon steel and stainless steel, 4.8, 6.8, 8.8, 10.8 grade bolt and nutthreaded product, including bolt, nut, washer, screws, threaded rod, and related products.ISO, ASME, DIN, BS, ENgalvanized and blackcarbon steel and stainless steel,4.8, 6.8, 8.8, 10.8 grade CERTIFICATE: ISO9001