With steel grade 4,Website:http://www.chinajinrui.net, grade 6, grade 8 and grade 10, JIS hex nut is widely used in field of machinery and equipment, construction, automobile, railway and other industries. JIS hex nut also use the dimensional requirments of metric series hex nut,including coarse thread and fine thread. The common standard of JIS hex nut is JIS B1181. Size from M3-M64 and can do many kinds of surface treatment.StandardGradeFinshJIS hex nut4white zincyellow zinc  black oxideH.D.GDacromet...6810