Product Name: Locknut Model NO.: fuji Grade: 12.9 Standard: DIN, ANSI Head Style: Round Connection: Common Bolt Groove: Square Type: Round Nut Material: Carbon Steel Product Description Locknut product model: DIN 981, DIN 1804, GUK, GUPMaterial: C45 and other steel on demand.Process: hot forgingProduction range: M10 to M260Mechanical properties: class 4, class 8Surface treatment: black-oxide, phosphate, plain, zinc plating