RLS AksIM-4 Dual Concentric Off-Axis Absolute Encoder
RLS · MPN AksIM-4 Dual Concentric · Maglev ID ac-rls-aksim-4-dual-concentric
SI Maker in Slovenia, factory not confirmed unknown VERIFIED
Two 19-bit absolute off-axis encoders in one ultra-thin ring (motor + reducer output), launched 2026 for humanoid and cobot joints.
Specifications
| Resolution | 19 bit per revolution on each ring (inner and outer) |
|---|---|
| Accuracy | System accuracy ±0.015° (inner MRA039) / ±0.010° (outer MRA053) after self-calibration; typical installed calibrated ±0.020° / ±0.015°; uncalibrated ±0.050° / ±0.040° |
| Max speed | 7,500 rpm (both rings) |
| Interface | BiSS C over RS422 (12-pin connector, separate channel per ring); SPI EncoLink for Dual Encoder (board-to-board) |
| Form | off-axis ring kit, dual (MD053 readhead, 180° arc, + MRA039 inner ring + MRA053 outer ring) |
| Sensing | unknown |
| Supply | 4.5-5.5 V at connector |
| Bore | 20 mm inner ring ID (MRA039); outer ring ID 40 mm, readhead ID 25 mm |
| Outer diameter | 53 mm outer ring OD; readhead OD 62 mm |
| Multi-turn | yes, 16-bit multiturn counter option (inner ring interface only) |
| Operating temp | -40 to 105 °C |
Who makes it
MakerRLS d.o.o.
Based inSlovenia
RoleBrand owner
Need a different shaft, connector, firmware or enclosure, or a price at 1,000 units? Maglev takes the catalog part to the factory and comes back with a custom version and one fixed price.
Landed cost in the US
CN
37.5%
TW
10%
VN
12.5%
IN
10%
JP
12.5%
KR
12.5%
DE
10%
MX
10%
US
0%
Total US duty on this part by where it is made (2026-10-29). Mexico shown before USMCA preference; qualifying goods enter duty free. Your factory choice, not the shipping port, sets the origin.
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Compliance
| HTS classification | 9031.80.80.85 typical, not a ruling |
|---|---|
| NDAA | unknown |
| Blue UAS | unknown |
| FCC | n/a |
Equivalents from other makers
Sources
- https://www.rls.si/eng/aksim-dualspecs: 19+19 bit, up to ±0.006°, 4.5-5.5 V, -40 to +105 °C
- https://www.rls.si/cn/news/aksim4-dual-concentric-launchlaunch news 2026-02-11, samples available
- https://cdn.rls.si/media/documents/MDD01.pdfAksIM-4 Dual Concentric datasheet MDD01: 19+19 bit, accuracy, 7,500 rpm, 4.5-5.5 V, ring sizes, interfaces, temperature
Record confidence: VERIFIED. VERIFIED means the maker's own documents; REPORTED means a credible third party; UNVERIFIED means a single weak source. Anything we could not confirm says unknown.