... to produce the hexagon slotted and castle nut with stainless steel, carbon steel and any other material.CASTLE NUT1.material: SS316, SS304, ... Industrial&Trade Co.,Ltd.has been assessed by GIC and certified to comply with ISO9001:2000. Our main products ... grease fitting,snapring,rubber sealing parts and related hardware fittings,which are exported to Japan,America,Germany,and Korea,etc. Castle Nut