The refreshed AR series with 2 digits and a “B” suffix (AR40-□□-B) was released in May 2012. And the new design AR series with 2 digits and a “D” suffix (AR40-□□-D) was released in October 2019.

AR10-A: Rc1/16
AR20-A to AR40-A, AR20(K)-B to AR60(K)-B, and AR20(K)-D to AR40(K)-D: Rc1/8
Old AR10: Rc1/16
Old AR20(K) to AR30(K): Rc1/8
Old AR40(K) to AR60(K): Rc1/4
Old AR1000: Rc1/16
Old AR2000 to AR3000: Rc1/8
Old AR4000 to AR6000: Rc1/4

The AR20K-B to AR60K-B and the AR20K-D to AR40K-D are regulators with a backflow function.
For example, if you want to install a regulator between a valve and a cylinder, select a regulator with a backflow function for the smooth flow of the cylinder return side compressed air to the regulator.

The second refreshed AC series (2 digits and a “B” suffix: AC□□-□□-B) was released in May 2014. And the third refreshed AC series (2 digits and a “D” suffix: AC□□-□□-D) was released in October 2019.
The AC series catalogs can be found here.

The AR-A, AR-B, AR-D, and old AR** series operation manuals can be found here.

The AW-A, AW-B, AW-D, and old AW** series operation manuals can be found here.

Function: 1 (2 Position Single), Piping: 3 (Body Ported), Exhaust: 0 (Individual), Low Wattage: None, Pressure Specification: Standard (0.7MPa), Coil Specification: Standard, Voltage: B (24VAC), Lead Wire: D (DIN Terminal w/Connector), Light/Surge Suppressor: Without light/surge voltage suppressor, Manual Override: D (Push-turn Locking Slotted Type), A, B Port Size: 01 (1/8), Thread: F (G

Function: 1 (2 Position Single), Piping: 3 (Body Ported), Exhaust: 0 (Individual), Low Wattage: None, Pressure Specification: Standard (0.7MPa), Coil Specification: Standard, Voltage: B (24VAC), Lead Wire: D (DIN Terminal w/Connector), Light/Surge Suppressor: Without light/surge voltage suppressor, Manual Override: D (Push-turn Locking Slotted Type), A, B Port Size: 02 (1/4)

Function: 3 (3 Position Closed Center), Piping: 4 (Base Mounted), Exhaust: 0 (Individual), Low Wattage: None, Pressure Specification: Standard (0.7MPa), Coil Specification: Standard, Voltage: B (24VAC), Lead Wire: D (DIN Terminal w/Connector), Light/Surge Suppressor: Without light/surge voltage suppressor, Manual Override: D (Push-turn Locking Slotted Type), A, B Port Size: 02 (1/4), Thread

Function: 3 (3 Position Closed Center), Piping: 4 (Base Mounted), Exhaust: 0 (Individual), Low Wattage: None, Pressure Specification: Standard (0.7MPa), Coil Specification: Standard, Voltage: B (24VAC), Lead Wire: D (DIN Terminal w/Connector), Light/Surge Suppressor: Z (With light/surge voltage suppressor), Manual Override: D (Push-turn Locking Slotted Type), A, B Port Size: 02 (1/4), Thread

Function: 1 (2 Position Single), Piping: 3 (Body Ported), Exhaust: 0 (Individual), Low Wattage: None, Pressure Specification: K (High-pressure, 1MPa), Coil Specification: Standard, Voltage: B (24VAC), Lead Wire: D (DIN Terminal w/Connector), Light/Surge Suppressor: Z (With light/surge voltage suppressor), Manual Override: D (Push-turn Locking Slotted Type), A, B Port Size: 02 (1/4), Thread

Function: 1 (2 Position Single), Piping: 3 (Body Ported), Exhaust: 0 (Individual), Low Wattage: None, Pressure Specification: K (High-pressure, 1MPa), Coil Specification: Standard, Voltage: B (24VAC), Lead Wire: D (DIN Terminal w/Connector), Light/Surge Suppressor: Z (With light/surge voltage suppressor), Manual Override: D (Push-turn Locking Slotted Type), A, B Port Size: 02 (1/4), Thread

Function: 1 (2 Position Single), Piping: 4 (Base Mounted), Exhaust: 0 (Individual), Low Wattage: None, Pressure Specification: K (High-pressure, 1MPa), Coil Specification: Standard, Voltage: B (24VAC), Lead Wire: D (DIN Terminal w/Connector), Light/Surge Suppressor: Z (With light/surge voltage suppressor), Manual Override: D (Push-turn Locking Slotted Type), A, B Port Size: 02 (1/4), Thread

Function: 3 (3 Position Closed Center), Piping: 3 (Body Ported), Exhaust: 3 (Common), Low Wattage: None, Pressure Specification: K (High-pressure, 1MPa), Coil Specification: Standard, Voltage: B (24VAC), Lead Wire: D (DIN Terminal w/Connector), Light/Surge Suppressor: Z (With light/surge voltage suppressor), Manual Override: D (Push-turn Locking Slotted Type), A, B Port Size: 01 (1/8), Thread

Function: 1 (2 Position Single), Piping: 3 (Body Ported), Exhaust: 3 (Common), Low Wattage: None, Pressure Specification: Standard (0.7MPa), Coil Specification: Standard, Voltage: B (24VAC), Lead Wire: D (DIN Terminal w/Connector), Light/Surge Suppressor: Without light/surge voltage suppressor, Manual Override: D (Push-turn Locking Slotted Type), A, B Port Size: 02 (1/4), Thread: F (G)

Lock: None, Body Shape: D (Mounting Tap: 4xM10x1.5, Pin Hole: 2xø8H7), Mounting Surface: B (Same Side as Port Location), Bore Size: 50mm, Port Thread: TF (G), Guide Pin Diameter: 195 (19.5mm), Guide Pin Shape: D (Diamond Type), Clamp Arm Position: B (90° From Port), Clamping Height: L (Low Type), Shim: S (With 3mm Shims)

Lock: L (With Lock), Body Shape: D (Mounting Tap: 4xM10x1.5, Pin Hole: 2xø8H7), Mounting Surface: B (Same Side as Port Location), Bore Size: 50mm, Port Thread: Rc, Guide Pin Diameter: 195 (19.5mm), Guide Pin Shape: D (Diamond Type), Clamp Arm Position: B (90° From Port), Clamping Height: L (Low Type), Shim: S (With 3mm Shims)

Lock: L (With Lock), Body Shape: D (Mounting Tap: 4xM10x1.5, Pin Hole: 2xø8H7), Mounting Surface: B (Same Side as Port Location), Bore Size: 50mm, Port Thread: Rc, Guide Pin Diameter: 195 (19.5mm), Guide Pin Shape: D (Diamond Type), Clamp Arm Position: B (90° From Port), Clamping Height: L (Low Type), Shim: S (With 3mm Shims), Auto Switch: P79W--Reed, 2-color Indication, High Magnetic Field

Lock: L (With Lock), Body Shape: D (Mounting Tap: 4xM10x1.5, Pin Hole: 2xø8H7), Mounting Surface: B (Same Side as Port Location), Bore Size: 50mm, Port Thread: TF (G), Guide Pin Diameter: 250 (25.0mm), Guide Pin Shape: D (Diamond Type), Clamp Arm Position: B (90° From Port), Clamping Height: H (High Type), Shim: S (With 3mm Shims)

Lock: L (With Lock), Body Shape: D (Mounting Tap: 4xM10x1.5, Pin Hole: 2xø8H7), Mounting Surface: B (Same Side as Port Location), Bore Size: 50mm, Port Thread: TF (G), Guide Pin Diameter: 250 (25.0mm), Guide Pin Shape: D (Diamond Type), Clamp Arm Position: B (90° From Port), Clamping Height: H (High Type), Shim: S (With 3mm Shims), Auto Switch: P74--Reed, DC Volt, AC Volt, High Magnetic