Airtac TWG Stop Cylinder TWG40X20SR
Genuine AirTAC adjustable mounting height stopper cylinder, order code TWG40X20SR from the TWG40 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- Stroke20 mm
- StopperRoller
- MagnetMagnet
- ActionDouble acting
- MountingFlange, adjustable mounting height
- BoreØ40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac TWG Stop Cylinder TWG40X20SR
The AirTAC TWG40X20SR is the roller-head version of the TWG40 stopper cylinder: an R stopper whose roller gives rolling contact as pallets, cartons or workpieces arrive at the stop. Bore is 40 mm, stroke is 20 mm with +1.0/0 tolerance, action is double acting, and the flange mounts with adjustable height so the roller can be set level with the conveyor surface.
Air is served through a PT1/8 port over 0.15-1.0 MPa, with a 1.5 MPa (215 psi) proof rating and -20 to +70 C service range. The S magnet supports magnetic position switches for up and down detection, and like the whole TWG series this cylinder runs without lubrication on air filtered by a 40 um element.
Airtac TWG Stop Cylinder TWG40X20SR Technical Specifications
| Order code | TWG40X20SR |
|---|---|
| Product | Adjustable mounting height Stopper Cylinder |
| Stroke | 20 mm |
| Stopper | Roller |
| Magnet | Magnet |
| Action | Double acting |
|---|---|
| Mounting | Flange, adjustable mounting height |
| Bore | Ø40 mm |
| Strokes | 20, 25, 30 mm (+1.0/0) |
| Port | PT1/8 |
| Stopper types | Round rod, Flat rod, Roller, Lever roller, adjustable oil cushion |
| Fluid | Air (filtered by 40 µm element) |
| Operating pressure | 0.15-1.0 MPa |
| Proof pressure | 1.5 MPa (215 psi) |
| Temperature | -20 to +70 °C |
| Cushion | Bumper |
| Lubrication | Not required |
Source: AirTAC Products Catalog 2026A (PDF01-P0756..P0757), TWG series specifications and ordering code.
How to choose
In the TWG40 ordering table the R position picks the roller stopper, sitting between B flat rod and K lever roller with adjustable oil cushion. Choose TWG40X20SR when rolling contact is wanted but the oil cushion of the K version, or the F self-lock available on the lever roller, is more than the job needs. If a fixed rod suits the load better, step to TWG40X20SC round rod or TWG40X20SB flat rod; strokes of 25 and 30 mm are also offered at this bore.
Applications
Roller-contact pallet stops
Approaching loads ride against the spinning roller rather than a fixed rod, then the 20 mm stroke retracts the stopper to let the flow resume.
Fixture present stops
Workpieces are halted ahead of machining or assembly stations; the S magnet gives the PLC a position signal for each stopper cycle.
Carton metering gates
Individual cartons are held and released on packaging infeed conveyors, with the 40 mm bore sized against the catalog impact load charts.
FAQ
What are the key figures of the TWG40X20SR?
40 mm bore, 20 mm stroke (tolerance +1.0/0 mm), double acting, flange mounting with adjustable height, PT1/8 port, operating pressure 0.15-1.0 MPa, proof pressure 1.5 MPa (215 psi), temperature -20 to +70 C, bumper cushion, roller stopper, magnet included, no lubrication required.
When is the R roller stopper the right choice over the K lever roller?
The R head gives rolling contact with the arriving load without the adjustable oil cushion, so it suits stops where impact is moderate and a simpler head is preferred. The lever roller with oil cushion (TWG40X20SK) and its F self-lock variant are the softer, load-holding alternatives.