Koyo NA2205-2RS track roller, 25 x 52 x 18 mm
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These Koyo NA22.2RS sealed yoke-type track rollers have caged needle rollers on an inner ring, with a crowned outer diameter. Track rollers, also known as cam followers, have thick-walled outer rings that run directly on a track. The thick outer rings give high load-carrying capability while keeping distortion and bending stresses low, and JTEKT designs them to withstand heavy rolling and shock loads on track-type or cam-controlled equipment. A crowned outer diameter alleviates uneven bearing loading caused by deflection, bending or misalignment in mounting.
The range has 12 sizes from 19 to 90 mm outside diameter. The thick-section outer ring is made of one-piece channel-shaped bearing-quality steel, heat-treated for maximum load-carrying capability. Integral end flanges guide the large diameter needle rollers axially and a cage retains them inwards. Two integral lip contact seals (.2RS) are thermally stable from -30 to 110 °C. Koyo bearings are made by JTEKT Corporation.
Where this product is used
- Ram support rollers
- Material handling equipment
- Indexing equipment
- Track-type and cam-controlled equipment
Features
- Crowned outer diameter: alleviates uneven loading from deflection, bending or misalignment in mounting
- Two integral lip contact seals (.2RS), thermally stable from -30 to 110 °C
- Dynamic load rating as a track roller Cw 4.13 to 31 kN; basic dynamic load rating as a bearing C 4.7 to 48 kN
- Grease lubrication speed rating 2,100 to 13,000 min-1 depending on size
- Thick-walled outer ring for high load capacity with low distortion and bending stress
Key specifications
| Specification | Detail |
|---|---|
| Type | Yoke-type, caged needle rollers, inner ring, two lip contact seals (.2RS), no end washers |
| Outer ring | Crowned outer diameter |
| Outside diameter D | 19 to 90 mm |
| Bore diameter d | 6 to 50 mm |
| Width B | 12 to 23 mm |
| Basic dynamic load rating as a bearing C | 4.7 to 48 kN |
| Basic static load rating as a bearing C0 | 5.43 to 71.3 kN |
| Dynamic load rating as a track roller Cw | 4.13 to 31 kN |
| Speed rating, grease lubrication | 2,100 to 13,000 min-1 |
| Approximate weight | 0.018 to 0.712 kg |
| Brand | Koyo (JTEKT) |
Available sizes
| Designation | Bore d (mm) | D (mm) | Width B (mm) | Bearing C (kN) | Bearing C0 (kN) | Cw (kN) | F0r perm (kN) | Speed (min-1) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|
| NA22/6-2RS | 6 | 19 | 12 | 4.7 | 5.43 | 4.13 | 4.59 | 13,000 | 0.018 |
| NA22/8-2RS | 8 | 24 | 12 | 6.7 | 6.08 | 5.31 | 5.22 | 11,000 | 0.031 |
| NA2200-2RS | 10 | 30 | 14 | 8.5 | 9.45 | 8.03 | 9.45 | 9,400 | 0.057 |
| NA2201-2RS | 12 | 32 | 14 | 9 | 10.5 | 8.2 | 10.1 | 8,100 | 0.063 |
| NA2202-2RS | 15 | 35 | 14 | 12.2 | 14.5 | 9.24 | 10.2 | 6,300 | 0.07 |
| NA2203-2RS | 17 | 40 | 16 | 16.3 | 17.8 | 11.9 | 13.7 | 5,900 | 0.107 |
| NA2204-2RS | 20 | 47 | 18 | 19.6 | 20.2 | 14.8 | 16.7 | 5,200 | 0.175 |
| NA2205-2RS | 25 | 52 | 18 | 21.6 | 24.3 | 15.5 | 17.7 | 4,300 | 0.202 |
| NA2206-2RS | 30 | 62 | 20 | 29 | 32.8 | 21.2 | 24.8 | 3,700 | 0.324 |
| NA2207-2RS | 35 | 72 | 23 | 40.5 | 52.5 | 28.6 | 37.9 | 3,000 | 0.49 |
| NA2208-2RS | 40 | 80 | 23 | 44 | 60 | 30.4 | 42 | 2,600 | 0.615 |
| NA2210-2RS | 50 | 90 | 23 | 48 | 71.3 | 31 | 43.4 | 2,100 | 0.712 |
Selecting the right option
Cw is the dynamic load rating as a track roller. For rating life (L10) calculations the applied radial load must not be greater than Cw/2 under ideal operating conditions of alignment, lubrication and temperature.
Fr perm is the maximum permissible dynamic radial load and F0r perm is the maximum permissible static radial load as a track roller. The F0r perm values give a minimum static factor fs of 0.7 for the worst internal load distribution, and they must not be exceeded, because exceeding them may cause permanent damage to the track roller.
The DZ suffix means cylindrical outer diameter, and a designation without DZ is crowned. Pick the one that suits your track.
Fitting and use
These track rollers are supplied without end washers, so the outer ring must be guided by the adjacent end locating surfaces. The two integral lip contact seals are thermally stable from -30 to 110 °C. Sealed yoke-type track rollers are normally supplied with an initial charge of medium-temperature grease.
Oil is the preferred lubricant for yoke-type track rollers. Use continuous oil lubrication or frequent grease lubrication for steady rotating conditions. Slow, intermittent oscillation is less critical and allows longer intervals between re-lubrication.
Related products
Also available from Koyo: the NA22.2RS.DZ track roller range, the STO track roller range and the NUTR track roller range.
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Koyo NA22.2RS Yoke-Type Track Roller, Sealed, with Inner Ring, Crowned: 25
SKU: A0157744 | Model: NA2205-2RS/KOYO
Koyo NA2205-2RS track roller, 25 x 52 x 18 mm, Cw 15.5 kN. Order online from AIMS Industrial.
