RG2/RG4 encoder series
What are RG2 and RG4 ?
RG2 and RG4 are the names given to a range of incremental encoder products that read 20 µm and 40 µm pitch scale types. These encoder products are not recommended for new designs. Some are currently being made obsolete but are available for Last Time Buys, as detailed in the links below:
Not recommended for new designs
Gold plated tape
Scale name | Accuracy | Scale pitch | Coefficient of thermal expansion | Supplied length
| Readhead compatibility |
RGS  | ±15 µm/m | 20 µm/40 µm | Thermally mastered to substrate by use of end clamps | Up to 50 m (>50 m contact Renishaw) |
Glass spar
Scale name | Accuracy | Scale pitch | Coefficient of thermal expansion | Supplied length
| Readhead compatibility |
RGS40-G  | ±4.2 µm/m | 40 µm | ~8 µm/m/°C | Up to 1.01 m |
Stainless steel tape with track option
Scale name | Accuracy | Scale pitch | Coefficient of thermal expansion at 20 °C | Supplied length | Readhead compatibility |
RTLR40 with optional FASTRACK™  | ±15 µm/m | 40 µm | 10.1 ±0.2 µm/m/°C
| Up to 10 m |
Stainless steel spar
Scale name | Accuracy | Scale pitch | Coefficient of thermal expansion at 20 °C | Supplied length | Readhead compatibility |
RSLR20  | ±1.5 µm up to 1 m, ±2.25 µm up to 2 m, ±3 µm up to 3 m, ±4 µm up to 5 m | 20 µm | 10.1 ±0.2 µm/m/°C | Up to 5 m |
Last Time Buy (LTB) products
The products below are being made obsolete with a Last Time Buy (LTB) option as follows:
- RGH20F encoder readheads: 26th November 2021
- RGH25F encoders readheads: 26th November 2021
- REF interfaces: 26th November 2021
- REB interfaces: 26th November 2021
Obsolete products
The products below are now obsolete and no longer available to order:
- RGH25F UHV encoder readheads