Unlike ordinary thread clamping pieces, which are made by stamping iron sheets and applying a thin electroplated layer, making them vulnerable to water and moisture, prone to blackening due to oxidation and rust, and likely to contaminate sewing threads, ceramic ones are not affected by humidity or rust, remaining clean and white. Their mirror surface flatness is many times higher than that of stamped parts, enabling more accurate thread clamping, and they can handle both thin and thick threads without the need to adjust tightness. When cutting threads, ceramic thread clamping pieces operate very smoothly, ensuring smooth thread passage and more stable lengths of cut thread ends. In contrast, the surface coating of ordinary thread clamping pieces in the thread clamps of lockstitch machines is easily worn off, leaving thread marks. Ceramic thread clamping pieces have a hardness far exceeding that of wear-resistant steel and stainless steel.