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See Chinese contents: QC/T 1103-2019 QC/T 1103-2019: 12-point head heat resistant nuts
This standard specifies the type, size, technical requirements, reference standard and number of 12-point head heat resistant nuts for automobiles. This standard is applicable to 12-point head heat resistant nuts for automobiles, which have thread specifications of M5 ~ M12, material properties abbreviated as SB, product grade of TA, working temperature below 700 °C.
