The executive standard of this product is GJB2446, which is equivalent to MIL-DTL-83513 standard. Corresponding to American MDM series products
  Number of cores: 9, 15, 21, 25, 31, 37, 51, 66 cores
  Strand type elastic contact pin (twist needle) is adopted, with contact spacing of 1.91mm and row spacing of 1.65mm
  Sectional area range of conductor core: 0.15 mm ² ～ 0.3mm ²
  It is widely used for circuit connection of various electronic equipment such as aerospace, aviation and electronic computers