Genuine AirTAC adjustable mounting height stopper cylinder, order code TWG40X25KF from the TWG40 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
The TWG40X25KF is the fully optioned lever roller version of the TWG series stopper cylinder: a Dia 40 mm bore, 25 mm stroke (+1.0/0 mm tolerance), lever roller stopper with adjustable oil shock absorber, plus the F self-lock. The self-lock stops the lever from springing back after impact and pushing the stopped load backwards, which matters wherever a pallet or workpiece arrives with force and must stay put. Air supply is through the PT1/8 port at 0.15-1.0 MPa and the cylinder is double acting.
The flange mounting carries the adjustable stopper height feature of the TWG series, so you set the raised roller to the load height on your machine. Proof pressure is 1.5 MPa (215 psi), the temperature range is -20 to +70 C, lubrication is not required, and the series follows JIS standards. No magnet is fitted on this code, so magnetic switch sensing is not included.
| Order code | TWG40X25KF |
|---|---|
| Product | Adjustable mounting height Stopper Cylinder |
| Stroke | 25 mm |
| Stopper | Lever roller, adjustable oil cushion, self-lock |
| 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.
Pick TWG40X25KF over TWG40X25K when the stopped load could shove the lever roller backwards after impact: the F suffix is exactly the self-lock option in the ordering table and is offered only on the lever roller stopper, so no C, B or R code can carry it. If your loads never push back, the plain TWG40X25K saves the option. Round and flat contact faces are TWG40X25C and TWG40X25B, and the 25 mm stroke siblings with self-lock are TWG40X20KF and TWG40X30KF.
On gently inclined conveyors where gravity keeps pushing the load into the stopper, the self-lock holds the lever roller down-stroke so the pallet does not creep back.
Use the F self-lock where a fast, heavy workpiece hits the roller and its momentum could spring the lever and shove the load backwards out of position.
Combine the adjustable oil cushion for a soft first contact with the self-lock for a held position, cycling the 25 mm stroke up and down on a busy pallet line.
Dia 40 mm bore; 25 mm stroke, tolerance +1.0/0 mm; double acting; lever roller stopper (K) with adjustable oil shock absorber and F self-lock; PT1/8 port; operating pressure 0.15-1.0 MPa; proof pressure 1.5 MPa (215 psi); temperature -20 to +70 C; no magnet; flange mounting with adjustable stopper height.
Both codes share the lever roller with adjustable oil cushion, 25 mm stroke and Dia 40 mm bore. The F suffix adds the self-lock function, which prevents the lever from springing back after impact and pushing the stopped load backwards. The self-lock is an ordering-code option on the lever roller stopper only; check the TWG datasheet for its internal details.