OBSOLETE - This item has been discontinued by SMC.
Superseded by the SMC AR-D Series. See replacement and crossover details below.
SMC AR20K-02BG Modular Air Regulator (Discontinued)
The SMC AR20K-02BG is a modular, relieving-type pneumatic regulator from the AR family: body size 20, 1/4" Rc (PT) ports, with backflow function. It is part of SMC's modular air-preparation (F.R.L.) system and has been discontinued by SMC.
Recommended Replacement
SMC AR-D Series
SMC ended production of the AR-A and AR-B regulator generations in March 2025. The current replacement is the AR-D series, which maintains panel-mount interchangeability with the previous AR models. Confirm the exact configured part number for your ports, gauge, and mounting options.
| Discontinued part | AR20K-02BG |
| Status | Discontinued by SMC |
| Replacement | SMC AR-D Series |
Part Number Breakdown: AR20K-02BG
| Segment | Code | Meaning |
|---|---|---|
| Series | AR | Modular air regulator |
| Body size | 20 | Size 20 body |
| Thread / port | 02 | Rc (PT) thread, 1/4" port |
| Backflow | K | With backflow function |
Specifications
| Series | AR (modular), relieving type |
| Body size | 20 |
| Port size / thread | 1/4" Rc (PT) |
| Backflow function | Yes |
| Max operating pressure | 1.0 MPa (approx. 145 psi) |
| Set pressure range | 0.05-0.85 MPa (approx. 7-123 psi), series standard |
| Regulation type | Relieving |
| Body material | Die-cast aluminum |
Specifying This Unit in a New Design
Do not design the AR20K-02BG into new equipment - it is discontinued and future availability is limited to remaining channel stock. For new builds, specify the equivalent SMC AR-D regulator. The AR-D is panel-mount interchangeable with the legacy AR and raises maximum set pressure to 125 psi. Use this page only to identify the correct current replacement for an existing installation.
Crossover Notes
- The AR-A and AR-B regulator generations ended production in March 2025; the AR-D series is the current replacement.
- AR-D maintains panel-mount pitch interchangeability with the AR(K)-B series; brackets and set nuts are shared.
- Match port size, thread type, gauge, and backflow (K) options when selecting the AR-D equivalent.
- Confirm the exact configured replacement part number with Automation Distribution before ordering.
Frequently Asked Questions
Is the SMC AR20K-02BG still available?
No. It has been discontinued by SMC. The current replacement is the equivalent AR-D series regulator.
What replaces the AR20K-02BG?
The equivalent SMC AR-D series regulator. AR-D is panel-mount interchangeable with the legacy AR line.
Is the AR-D a drop-in for my existing installation?
AR-D maintains panel-mount interchangeability with previous AR models. Confirm port, gauge, and mounting options match your original spec before ordering.
Need the current replacement for your AR20K-02BG?
Automation Distribution is an authorized SMC distributor. We will confirm the correct crossover for your configuration. Call 1-888-600-3080.
View the SMC AR-D replacement- Accessory:
- B+G
- Port Size:
- 1/4
- Thread:
- PT
- Reverse Flow:
- Regulator w/Backflow Mechanism
- Size:
- 1/8
