
They are used in coupling gears and brake rods in railway waggons, valves, slides, fittings and by the fire brigade. The Knuckle Threads are insensitive to dirt and damages. The flank angle is 30°. Nominal Diameter  Thread Size  Nominal Diameter mm  Bolt Thread Minor Diameter mm  Nut Thread Minor Diameter mm  Pitch mm  TPI  Rd 8 x 1/10"  8.254  5.460  5.714  2.540  10  Rd 9 x 1/10"  9.254  6.460  6.714  2.540  10  Rd 10 x 1/10"  10.254  7.460  7.714  2.540  10  Rd 11 x 1/10"  11.254  8.460  8.714  2.540  10  Rd 12 x 1/10"  12.254  9.460  9.714  2.540  10  Rd 14 x 1/8"  14.318  10.825  11.142  3.175  8  Rd 16 x 1/8"  16.318  12.825  13.142  3.175  8  Rd 18 x 1/8"  18.318  14.825  15.142  3.175  8  Rd 20 x 1/8"  20.318  16.825  17.142  3.175  8  Rd 22 x 1/8"  22.318  18.825  19.142  3.175  8  Rd 24 x 1/8"  24.318  20.825  21.142  3.175  8  Rd 28 x 1/8"  28.318  24.825  25.142  3.175  8  Rd 30 x 1/8"  30.318  26.825  27.142  3.175  8  Rd 32 x 1/8"  32.818  28.825  29.142  3.175  8  Rd 34 x 1/8"  34.318  30.825  31.142  3.175  8  Rd 36 x 1/8"  36.318  32.825  33.142  3.175  8  Rd 38 x 1/8"  38.318  34.825  35.142  3.175  8  Rd 40 x 1/6"  40.423  35.767  36.190  4.233  6  Rd 42 x 1/6"  42.423  37.767  38.190  4.233  6  Rd 44 x 1/6"  44.423  39.767  40.190  4.233  6  Rd 46 x 1/6"  46.423  41.767  42.190  4.233  6  Rd 48 x 1/6"  48.423  43.767  44.190  4.233  6  Rd 50 x 1/6"  50.423  45.767  46.190  4.233  6  Rd 52 x 1/6"  52.423  47.767  48.100  4.233  6  Rd 55 x 1/6"  55.423  50.767  51.190  4.233  6  Rd 58 x 1/6"  58.423  53.767  54.190  4.233  6  Rd 60 x 1/6"  60.423  55.767  56.190  4.233  6  Rd 62 x 1/6"  62.423  57.767  58.190  4.233  6  Rd 65 x 1/6"  65.423  60.767  61.190  4.233  6  Rd 68 x 1/6"  68.423  63.767  64.190  4.233  6  Rd 70 x 1/6"  70.423  65.767  66.190  4.233  6  Rd 72 x 1/6"  72.423  67.767  68.190  4.233  6  Rd 75 x 1/6"  75.423  70.767  71.190  4.233  6  Rd 78 x 1/6"  78.423  73.767  74.190  4.233  6  Rd 80 x 1/6"  80.423  75.767  76.190  4.233  6  Rd 82 x 1/6"  82.423  77.767  78.190  4.233  6  Rd 85 x 1/6"  85.423  80.767  81.190  4.233  6  Rd 88 x 1/6"  88.423  83.767  84.190  4.233  6  Rd 90 x 1/6"  90.423  85.767  86.190  4.233  6  Rd 92 x 1/6"  92.423  87.767  88.190  4.233  6  Rd 95 x 1/6"  95.423  90.767  91.190  4.233  6  Rd 98 x 1/6"  98.423  93.767  94.190  4.233  6  Rd 100 x 1/6"  100.423  95.767  96.190  4.233  6  Rd 105 x 1/4"  105.635  98.650  99.285  6.350  4  Rd 110 x 1/4"  110.635  103.650  104.285  6.350  4  Rd 115 x 1/4"  115.635  108.650  109.285  6.350  4  Rd 120 x 1/4"  120.635  113.650  114.285  6.350  4  Rd 125 x 1/4"  125.635  118.650  119.285  6.350  4  Rd 130 x 1/4"  130.635  123.650  124.285  6.350  4  Rd 135 x 1/4"  135.635  128.650  129.285  6.350  4  Rd 140 x 1/4"  140.635  133.650  134.285  6.350  4  Rd 145 x 1/4"  145.635  138.650  139.285  6.350  4  Rd 150 x 1/4"  150.635  143.650  144.285  6.350  4  Rd 155 x 1/4"  155.635  148.650  149.285  6.350  4  Rd 160 x 1/4"  160.635  153.650  154.285  6.350  4  Rd 165 x 1/4"  165.635  158.650  159.285  6.350  4  Rd 170 x 1/4"  170.635  163.650  164.285  6.350  4  Rd 175 x 1/4"  175.635  168.650  169.285  6.350  4  Rd 180 x 1/4"  180.635  173.650  174.285  6.350  4  Rd 185 x 1/4"  185.635  178.650  179.285  6.350  4  Rd 190 x 1/4"  190.635  183.650  184.285  6.350  4  Rd 195 x 1/4"  195.635  188.650  189.285  6.350  4  Rd 200 x 1/4"  200.635  193.650  194.285  6.350  4  


