Koyo NUKR47-2SK cam follower, D 47 mm, stud 20 mm
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This Koyo NUKR stud-type track roller (cam follower) has a full complement of cylindrical rollers and a crowned outer ring. 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. The stud allows cantilever mounting, and the hexagonal socket in both the flange and stud ends (2SK) facilitates mounting. A crowned outer diameter alleviates uneven bearing loading caused by deflection, bending or misalignment in mounting.
The range has 8 sizes from 35 to 90 mm outside diameter. The track roller is a non-separable unit of outer ring, full complement of cylindrical rollers, stud and a retaining washer fastened to the stud. 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
- Full complement of cylindrical rollers in a non-separable stud-type unit, for cantilever mounting
- Hexagonal socket in both flange and stud ends (2SK)
- Dynamic load rating as a track roller Cw 16.2 to 77.8 kN; basic dynamic load rating as a bearing C 24.7 to 95.4 kN
- Grease lubrication speed rating 2,600 to 6,100 min-1 depending on size
- Thick-walled outer ring for high load capacity with low distortion and bending stress
Key specifications
| Specification | Detail |
|---|---|
| Type | Stud-type, full complement of cylindrical rollers, hexagonal socket in both flange and stud ends (2SK) |
| Outer ring | Crowned outer diameter |
| Outside diameter D | 35 to 90 mm |
| Stud diameter d1 | 16 to 30 mm |
| Stud thread G | M16x1.5, M18x1.5, M20x1.5, M24x1.5, M30x1.5 |
| Basic dynamic load rating as a bearing C | 24.7 to 95.4 kN |
| Basic static load rating as a bearing C0 | 29.4 to 130 kN |
| Dynamic load rating as a track roller Cw | 16.2 to 77.8 kN |
| Speed rating, grease lubrication | 2,600 to 6,100 min-1 |
| Approximate weight | 0.17 to 2.02 kg |
| Brand | Koyo (JTEKT) |
Available sizes
| Designation | D (mm) | Stud d1 (mm) | Width C (mm) | Stud length B2 (mm) | Thread G | Cw (kN) | F0r perm (kN) | Speed (min-1) | Torque (N-m) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|
| NUKR35-2SK | 35 | 16 | 18 | 32.5 | M16x1.5 | 16.2 | 16.1 | 6,100 | 53.2 | 0.17 |
| NUKR40-2SK | 40 | 18 | 20 | 36.5 | M18x1.5 | 18.7 | 23.9 | 5,300 | 77.5 | 0.25 |
| NUKR47-2SK | 47 | 20 | 24 | 40.5 | M20x1.5 | 28.1 | 32.7 | 4,500 | 109 | 0.38 |
| NUKR52-2SK | 52 | 20 | 24 | 40.5 | M20x1.5 | 29.6 | 35.4 | 3,700 | 109 | 0.461 |
| NUKR62-2SK | 62 | 24 | 29 | 49.5 | M24x1.5 | 40.9 | 47.2 | 3,200 | 193 | 0.79 |
| NUKR72-2SK | 72 | 24 | 29 | 49.5 | M24x1.5 | 46.1 | 63.1 | 2,600 | 193 | 1.04 |
| NUKR80-2SK | 80 | 30 | 35 | 63 | M30x1.5 | 69.7 | 101 | 2,900 | 390 | 1.55 |
| NUKR90-2SK | 90 | 30 | 35 | 63 | M30x1.5 | 77.8 | 128 | 2,900 | 390 | 2.02 |
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.
Choose the size by the outside diameter D and the stud diameter and thread G that match the mounting hole.
Fitting and use
Stud-type track rollers are supplied with a lithium soap-based, general-purpose grease. The full complement series has less internal volume for grease than the caged type, so it may need more frequent re-lubrication. Grease fittings (VENN series) and plugs are supplied with metric series stud-type track rollers, and unused holes should be closed with the plugs.
When the stud is fitted in a hole of tolerance H7, apply installation force only to the centre of the flanged end of the stud, preferably with an arbor press. The retaining washer must be firmly backed by a flat shoulder square to the stud centre line, with a shoulder diameter no smaller than the minimum clamping diameter da. Do not tighten the nut beyond the maximum tightening torque in the table.
Related products
Also available from Koyo: the CRSB-40 cam follower, the NUTR track roller range and the NATR track roller range.
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Koyo NUKR Stud-Type Cam Follower, Full Complement Cylindrical Rollers, Crowned, Hex Socket (35 to 90 mm): 47
SKU: A0156956 | Model: NUKR47-2SK/KOYO
Koyo NUKR47-2SK cam follower, D 47 mm, stud 20 mm, Cw 28.1 kN.