material low carbon steel surface treatment white zinc plated standard DIN ANSI BSW ,GB,JIS grade 4.8 5. ... 8 6.8 8.8 10.9 b7 white zinc plated threaded rod1Company profile: jiashan lisan metal product co,ltd, china ... , mild steel. stainless steel5The surface treatment: white zinc plated, white-blue zinc plated, yellow zin cplated, plain,black,hot dip galvanization white ...