This standard specifies the terms and definitions, basic requirements, product classification, technical requirements, test methods, marking, packaging, transportation and storage and quality commitment of thread clamping terminal blocks. This standard applies to threaded clamping terminal blocks (hereinafter referred to as terminal blocks) with an inner width of 4 mm to 6 mm, an inner height of 4.5 mm to 8 mm, and wall thicknesses of 0.8 mm and 1 mm. This standard applies to terminal blocks used for electrical fixed connections within terminal blocks.