SI Series Internal Thread Self-Lubricating Rod End Bearings
The SI Series internal thread (female) self-lubricating rod end bearings feature a right-hand internal thread for direct mounting onto threaded shafts or studs. These maintenance-free bearings utilize an advanced steel-on-PTFE composite sliding surface with a bronze outer ring, eliminating the need for periodic lubrication while providing excellent wear resistance and low friction. The rod end body is manufactured from carbon steel with an eco-friendly white zinc plating, while the inner ring (ball) is made from bearing steel with a hard chrome-plated spherical surface. These bearings can be lubricated through a grease nipple or via the rod end eye, and offer good radial load capacity. Available in bore sizes from 5mm to 50mm with metric internal threads, the SI Series is ideal for linkages, control systems, agricultural equipment, and general machinery where a female rod end connection is required. Stainless steel versions are available upon request For left-hand thread applications, add an "L" suffix, e.g. SIL 20T/K. Stainless steel versions available by adding "S" prefix when ordering.
Technical Specifications
| Bearing No. | d (mm) | B (mm) | dk (mm) | C1 max (mm) | d2 max (mm) | G | h1 (mm) | L3 min (mm) | L4 max (mm) | L5 (mm) | W (mm) | d4 (mm) | d5 (mm) | R1s min (mm) | a° ≈ | Dyn.C (kN) | Stat.Co (kN) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SI5T/K | 5 | 8 | 11.11 | 6 | 18 | M5×0.8 | 27 | 10 | 36 | 4 | 9 | 8.5 | 11 | 0.3 | 13 | 5.7 | 6 | 0.016 |
| SI6T/K | 6 | 9 | 12.7 | 6.75 | 20 | M6×1.0 | 30 | 12 | 40 | 5 | 11 | 10 | 13 | 0.3 | 13 | 7.2 | 7.65 | 0.022 |
| SI8T/K | 8 | 12 | 15.875 | 9 | 24 | M8×1.25 | 36 | 16 | 48 | 5 | 14 | 12.5 | 16 | 0.3 | 14 | 11.6 | 12.9 | 0.047 |
| SI10T/K | 10 | 14 | 19.05 | 10.5 | 28 | M10×1.5 | 43 | 20 | 57 | 6.5 | 17 | 15 | 19 | 0.3 | 13 | 14.5 | 18 | 0.077 |
| SI10-1T/K | 10 | 14 | 19.05 | 10.5 | 28 | M10×1.25 | 43 | 20 | 57 | 6.5 | 17 | 15 | 19 | 0.3 | 13 | 14.5 | 18 | 0.077 |
| SI12T/K | 12 | 16 | 22.225 | 12 | 32 | M12×1.75 | 50 | 22 | 66 | 6.5 | 19 | 17.5 | 22 | 0.3 | 13 | 17 | 24 | 0.100 |
| SI12-1T/K | 12 | 16 | 22.225 | 12 | 32 | M12×1.25 | 50 | 22 | 66 | 6.5 | 19 | 17.5 | 22 | 0.3 | 13 | 17 | 24 | 0.100 |
| SI14T/K | 14 | 19 | 25.40 | 13.5 | 36 | M14×2.0 | 57 | 25 | 75 | 8 | 22 | 20 | 25 | 0.3 | 16 | 24 | 31 | 0.160 |
| SI14-1T/K | 14 | 19 | 25.40 | 13.5 | 36 | M14×1.5 | 57 | 25 | 75 | 8 | 22 | 20 | 25 | 0.3 | 16 | 24 | 31 | 0.160 |
| SI16T/K | 16 | 21 | 28.575 | 15 | 40 | M16×2.0 | 64 | 28 | 85 | 8 | 22 | 22 | 27 | 0.3 | 15 | 28.5 | 39 | 0.220 |
| SI16-1T/K | 16 | 21 | 28.575 | 15 | 40 | M16×1.5 | 64 | 28 | 85 | 8 | 22 | 22 | 27 | 0.3 | 15 | 28.5 | 39 | 0.220 |
| SI18T/K | 18 | 23 | 31.75 | 16.5 | 44 | M18×1.5 | 71 | 32 | 93 | 10 | 27 | 25 | 31 | 0.3 | 15 | 42.5 | 47.5 | 0.320 |
| SI20T/K | 20 | 25 | 34.925 | 18 | 50 | M20×1.5 | 77 | 33 | 102 | 10 | 30 | 27.5 | 34 | 0.3 | 14 | 42.5 | 57 | 0.420 |
| SI22T/K | 22 | 28 | 38.10 | 20 | 54 | M22×1.5 | 84 | 37 | 111 | 12 | 32 | 30 | 38 | 0.3 | 15 | 57 | 68 | 0.540 |
| SI25T/K | 25 | 31 | 42.85 | 22 | 60 | M24×2 | 94 | 42 | 124 | 12 | 36 | 33.5 | 42 | 0.3 | 15 | 68 | 85 | 0.720 |
| SI28T/K | 28 | 35 | 47.60 | 24 | 66 | M27×2 | 103 | 51 | 136 | 14 | 41 | 37 | 46 | 0.3 | 15 | 86 | 107 | 0.820 |
| SI30T/K | 30 | 37 | 50.80 | 25 | 70 | M30×2 | 110 | 51 | 145 | 15 | 41 | 40 | 50 | 0.3 | 17 | 88 | 114 | 1.100 |
| SI30-1T/K | 30 | 37 | 50.80 | 25 | 70 | M27×1.5 | 110 | 51 | 145 | 15 | 41 | 40 | 50 | 0.3 | 17 | 88 | 114 | 1.100 |
| SI35T/K | 35 | 43 | 57.10 | 28 | 81 | M36×2 | 125 | 56 | 165.5 | 17 | 50 | 46 | 58 | 0.3 | 16 | 101 | 206 | 1.600 |
| SI40T/K | 40 | 49 | 66.60 | 33 | 91 | M42×2 | 142 | 60 | 187.5 | 19 | 55 | 53 | 65 | 0.3 | 17 | 124 | 280 | 2.400 |
| SI50T/K | 50 | 60 | 82.50 | 45 | 117 | M48×2 | 160 | 65 | 218.5 | 23 | 65 | 65 | 75 | 0.3 | 12 | 308 | 485 | 5.000 |
Dimensions in mm.
For left-hand thread, add "L" suffix to both bearing number and thread mark, e.g. SIL 20T/K.
Sliding contact surfaces: Steel / PTFE composite material.
Rod end body: Carbon steel with eco-friendly white zinc plating. Outer ring: Bronze with PTFE composite sliding surface — maintenance-free. Inner ring (ball): Bearing steel, hardened, spherical surface with hard chrome plating. Large load capability, easy mounting and dismounting, mechanism simplification. Available in stainless steel by adding "S" prefix to bearing number when ordering.
