Hygienic Hex Nut Nut Overall Height 21 mm Nut Material Grade 316L Standards EHEDG Certified FDA Compliant RoHS For Environment Hygienic System of Measurement Metric Nut Material Stainless Steel Thread Size M12 Thread Depth 14.5 mm Collar Diameter 25 mm Washer Outside Diameter 25.8 mm Hex Width 18 mm Seal Material EPDM Seal Material - Maximum Temperature 120 Degrees C Seal Material - Minimum Temperature -40 Degrees C Average Surface Roughness (Ra) less than 0.8 micron