Genuine AirTAC adjustable mounting height stopper cylinder, order code TWG40X30-B from the TWG40 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
TWG40X30-B delivers the maximum lift in the AirTAC TWG40 flat rod group: 30 mm of stroke on the Dia 40 mm bore, held to a +1.0/0 mm tolerance. This is the code to specify when pallets must clear deeper gaps, taller guides or the transfer decks of a conveyor junction. The cylinder is double acting with a flange that offers adjustable mounting height, and the stopper retracts below the load path when the PT1/8 port vents and fills in the opposite direction.
The B option gives the flat rod stopper, whose broad face stops a pallet or box squarely under impact; the series thicker piston rod is built for exactly that duty. The unit tolerates 1.5 MPa proof pressure (215 psi) against its 0.15-1.0 MPa working range and operates from -20 to +70 C. As ordered here there is no magnet, and the cylinder runs without lubrication on air filtered by a 40 um element, following JIS standards.
| Order code | TWG40X30-B |
|---|---|
| Product | Adjustable mounting height Stopper Cylinder |
| Stroke | 30 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.
Choose TWG40X30-B when you need the tallest stop of the flat rod family: its 30 mm stroke exceeds TWG40X20-B (20 mm) and TWG40X25-B (25 mm), which is why it is the usual pick at transfer stations and lift junctions. If the extra lift is not required, the shorter siblings give a lower profile. For other contact faces move to C (round rod), R (roller) or K (lever roller with adjustable oil cushion, the only version that accepts the F self-lock), and order the S variant if a magnet for sensors is wanted.
At a pallet transfer or turntable junction, the 30 mm stroke lifts the flat rod high enough to clear decks and guides that a shorter stopper would foul.
Use the full 30 mm lift to firmly catch the lead pallet at the end of a chain or roller conveyor, then retract fully to let it pass.
Combine the adjustable mounting height flange with the maximum 30 mm stroke to cover deep clearance variations in multi-line accumulation areas.
Dia 40 mm bore, 30 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.
The extra lift lets the stopper clear deeper obstacles such as transfer decks, guide rails and turntable edges, so TWG40X30-B fits conveyor junctions and end-of-line gates where the 20 mm or 25 mm versions would not retract far enough below the load path. Sizing against impact load and speed should follow the charts in the catalog.