There is octagonal nut and it is use to auto part. Material: 45#,40Cr. Specification:3.480-12 UNS-2B,octagonal across flats:122mm,high:28.5mm Technics:hot/cold forging-lathes-hot treatment-grinding-rolling-plating. Grade:8~10(HRC 22-28~HRC 28-38). Tensile strength:89.8 kg/mm2~91.8 kg/mm2. Finish:blackening. Weight:1.34 KG/PCS
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