Type NRT (with NRV)
This roller recirculating unit is designed for medium to heavy loads. The Type NRT recirculating unit is equipped with needle bearings and designed for use with Type NRV linear guideways. Solutions to demanding applications can be created using NRT, NRV, and suitable guideways. The NRT series offers extremely high load capacity (up to 181,000 N) and rigidity, making it particularly suitable for high-precision, heavy-load linear motion applications such as machine tools and precision machining equipment.
Benchmark Data
Carrier Structure
- High precision hardened and ground
Materials
- Carrier structure: Through-hardened tool steel, hardness 58 - 62 HRC
- Rolling elements: Through-hardened needle bearing steel, hardness 58 - 64 HRC
- Retainer: High-performance polymer
- End caps: Polymer
Wipers
- Integrated end cap wiper for coarse contamination protection
- Optional additional elastomer wipers available
Speed
1 m/s
Acceleration
30 m/s²
Operating Temperature
-40°C to +80°C
Compatibility
Type NRT recirculating units can be used with the following linear guideways:
- Type NRV (Needle roller guideways)
Dimensions and Load Capacities of Type NRT
Dimension Diagram
Specification Table
| Type and Size | Weight (g) | Dimensions (mm) | Load Capacity C (N) | Options (see Ch. 8) | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | Dw | G | Kt | L | L1 | L2 | Lw | N | d | e | f | f1 | g | g1 | m | ||||
| NRT 19077 | 185 | 19 | 27 | 5 | 18.85 | 45 | 77 | 25.5 | 49.2 | 13 | 20.6 | 6 | M4 | 3.3 | 6 | 15.5 | 6 | 5.3 | 43,000 | GP ZS |
| NRT 26111 | 570 | 26 | 40 | 7 | 25.85 | 70 | 111 | 44 | 75.6 | 19 | 30 | 8 | M6 | 5 | 9 | 20 | 10 | 10.3 | 98,000 | GP ZS |
| NRT 26132 | 721 | 26 | 40 | 7 | 25.85 | 91 | 132 | 68 | 96.6 | 19 | 30 | 8 | M6 | 5 | 9 | 20.6 | 10 | 10.3 | 120,000 | GP ZS |
| NRT 38144 | 1,390 | 38 | 52 | 10 | 37.8 | 90 | 144 | 51 | 96.8 | 26 | 41 | 11 | M8 | 6.8 | 11 | 29 | 14 | 14.5 | 181,000 | GP ZS |
Notes:
- Option GP: Needle bearing recirculating unit with preload
- Option ZS: Additional wiper
- C represents dynamic load capacity
- NRT series must be used with Type NRV guideways
Type NRV Preload Wedge
The Type NRV preload wedge is used in combination with Type NRT recirculating units to provide system preload for high rigidity and precision. For preload using preload wedge NRV, specific infeed values apply. The NRV preload wedge features an adjustable design with setting screws, lubrication holes, and locking screws.
Dimension Diagram
Specification Table
| Type and Size | Weight (g) | Dimensions (mm) | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | H max. | L max. | L1 | L2 | L3 | L4 max. | L5 | L6 | N | b | b1 | d | d1 | e | e1 | f | g | ||
| NRV 19077 | 195 | 16 | 27 | 7 | 72 | 25.5 | 22.5 | 16.5 | 68 | 61 | 56 | 20.6 | 7 | 9 | 7 | 9 | M4 | M3 | 3.3 | 4.5 |
| NRV 26111 | 670 | 25 | 40 | 8 | 105 | 44 | 29 | 21 | 98 | 90 | 83 | 30 | 9 | 17.5 | 8 | 11 | M6 | M4 | 5 | 8 |
| NRV 26132 | 837 | 126 | 68 | 27.5 | 19.5 | 119 | 111 | 104 | 29.5 | |||||||||||
| NRV 38144 | 1,300 | 30 | 52 | 8 | 130 | 51 | 37.5 | 28.5 | 121 | 113 | 105 | 41 | 10 | 20.5 | 11 | 14 | M8 | M6 | 6.8 | 8 |
Notes:
- NRV preload wedge must be used with matching NRT recirculating unit model
- Provides adjustable preload function
- Features setting screws, lubrication holes, and locking screws
- Oil delivery through the lube opening on top through the preload wedge NRV