Specification for JR21RK-16S
| Case | size 21 |
| Electrical mounting | soldering |
| Connector | socket |
| Kind of connector | female |
| Mechanical mounting | flange (4 holes), for panel mounting |
| Contact plating | silver plated |
| Type of connector | circular |
| Number of pins | 16 |
| Current rating | 5A |
| Locking system | external thread, threaded joint |
| Spatial orientation | straight |