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 thread angle is 30°.
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 |
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