Spring tension anti-backlash nut Lead screw NUT Tr8*2, Tr8*4, Tr8*8 or Tr8*12 Made of Brass, work together with tension spring TR8x2: 2mm pitch, 1 start, 2mm of linear movement per rotation. TR8x4: 2mm pitch, 2 starts, 4mm of linear movement per revolution. TR8x8: 2mm pitch, 4 starts, 8mm of linear ...