Nut, Used for Switch, Relay, or Thermostats and so on, RoHS Compliant Materials: steel, alloy steel and stainless steelStandards: DIN934, DIN555, DIN439, UNI5587, ... DIN6915, DIN1587, DIN439, A194, A563, and ANSI B18.2.2Grades: 2, 5, 6, 8, A194 2H ... , A194 4, and A563 DHSurface: plain, black, phosphate, zinc, hot dip galvanizing, dacromet ...