Airtac TWG Stop Cylinder TWG40X20-B
Genuine AirTAC adjustable mounting height stopper cylinder, order code TWG40X20-B from the TWG40 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- Stroke20 mm
- StopperFlat rod
- MagnetNo magnet
- 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 TWG40X20-B
The AirTAC TWG40X20-B pairs the Dia 40 mm bore of the TWG series with the shortest standard stroke, 20 mm with a +1.0/0 mm tolerance. It is a double acting stopper cylinder flange mounted with an adjustable mounting height, so you set the stop face to the pallet or box line on the machine rather than shimming the bracket. Air on the PT1/8 port raises and lowers the stopper, and the thicker piston rod of the series resists impact from moving loads.
The B option in the order code selects the flat rod stopper, whose wide flat face gives more contact area than the round rod and helps hold a box or pallet square at the stop. Because the code carries no S, this unit has no magnet, so there is no built-in switching band for position sensors. It runs on air filtered by a 40 um element, needs no lubrication, and follows JIS standards.
Airtac TWG Stop Cylinder TWG40X20-B Technical Specifications
| Order code | TWG40X20-B |
|---|---|
| Product | Adjustable mounting height Stopper Cylinder |
| Stroke | 20 mm |
| Stopper | Flat rod |
| Magnet | No 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
Pick TWG40X20-B when the stopper should lift as little as possible: the 20 mm stroke suits thin pallet boards and tight clearances where a taller rise would bump the load above it. If the machine layout needs more lift, step up to TWG40X25-B or TWG40X30-B in the same flat rod style. For other contact faces the siblings are C (round rod), R (roller) and K (lever roller with adjustable oil cushion); the F self-lock applies only to the lever roller version. If you later need sensor feedback on board, order the S variant with magnet instead.
Applications
Roller conveyor pallet stop
Flange mount at line height and use the 20 mm stroke to raise the flat rod just enough to catch pallet boards on a roller conveyor.
Carton queue gate
The wide flat face squares cartons as they accumulate, and the 20 mm lift keeps the stop below the next passing box.
Fixture hold position
Use the adjustable mounting height to dial in the exact stop face location for workpieces entering a machining or assembly fixture.
FAQ
What are the key figures of the TWG40X20-B?
Dia 40 mm bore, 20 mm stroke (+1.0/0 mm), double acting, flat rod stopper, PT1/8 port, operating pressure 0.15-1.0 MPa, proof pressure 1.5 MPa (215 psi), temperature -20 to +70 C, bumper cushion, air filtered by a 40 um element, no lubrication required, flange with adjustable mounting height.
Does this stopper cylinder include a magnet or position sensing?
No. The order code TWG40X20-B has no S, so the cylinder ships without a magnet and has no internal switching band. If you need onboard sensor capability, order the S variant of the same code; otherwise use external sensing or machine logic.