... EN 14399-4 replce DIN6915 Steel hexagon nuts with large width across flats for high-strength structural bolting Gra.: HV10DIN EN ... 14399-4 replce DIN6915Steel hexagon nuts with large width across flats for high-strength structural boltingGrade: HV10SIZE: M12-M36Material ... , Black, H.D.G., etc. Steel hexagon nuts with large width across flats for high-strength structural bolting