The 133 SPI needle (needle system 133) has an acute round point for working woven and knit fabrics. It is used in industrial lockstitch and general-purpose sewing machines for everyday garment and textile manufacturing. Suitable machine classes are found, among others, at Maquinas de Coser Alfa (classes 105, 125, 127, 136), Pfaff (classes 112, 114 bis 3MM ZIGZAG, 130, 133) and Textima (classes 8333).
Thinner needle sizes are used, among others, for light, fine woven and knit fabrics such as blouse and shirt fabrics, and the thicker versions for heavy, multi-layer woven and knit fabrics as well as technical textiles. As sewing thread, a matching thickness is usually recommended depending on the needle size chosen, e.g. from Amann Serafil or Rasant (polyester).