GB/T 830-1988

GB/T 830-1988 specifies the dimensions, tolerances, and technical requirements for slotted cheese head screws with a shoulder, which are used to secure components in mechanical assemblies where precise axial positioning and a flush or controlled head height are needed. This standard is applied in the manufacturing of machinery, instruments, and electronic devices within China, particularly for fastening parts that require a shoulder to act as a spacer or pivot point. It is commonly referenced in quality control and procurement for industrial equipment, automotive components, and precision tools.