The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X140-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 140mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X140-50S is a 50 mm bore double-acting single-rod cylinder featuring a rear-cap adjusting screw that provides up to 50 mm of field-adjustable stroke-end reduction. This allows fine-tuning of the 140 mm nominal stroke without swapping the cylinder, delivering 982 N of push force and 825 N of pull force at 0.5 MPa.
Equipped with a built-in magnet (-S suffix), this model directly accepts CMSG/DMSG/EMSG reed and solid-state sensors for reliable end-of-stroke detection. The 20 mm diameter piston rod, PT1/4 ports, and a cushion length of 21 mm make it a robust choice for commissioning trials and format changeovers on packaging or assembly machinery.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X140-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 140 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×140 | Nominal (maximum) stroke length in mm. |
| -50 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
The 50 mm adjustment screw lets technicians dial in the exact stroke end position during machine setup, eliminating the need for multiple fixed-stroke cylinder swaps.
Quickly adapt the cylinder's stroke for different product sizes on packaging lines by adjusting the rear screw, reducing downtime between production runs.
As tooling or gripper pads wear over time, the adjustable stroke end can be extended slightly to maintain precise contact without replacing the actuator.
Step up to the 63 mm bore SCJ (1559 N push at 0.5 MPa) if the 982 N output of this 50 mm unit is marginal for your load. For applications that do not require field-adjustable stroke, a fixed-stroke SC50 cylinder offers a simpler, more compact alternative. When replacing this cylinder, match the 50 mm bore, 140 mm nominal stroke, 50 mm adjustment range, PT port thread, and the integrated magnet; the basic mounting style uses no additional bracket. For strokes over 300 mm, consider an external guide rail to protect the 20 mm rod from side-load bending.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this cylinder generates 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N.
Yes, if you need field-adjustable stroke. Ensure the replacement matches the 50 mm bore, PT1/4 ports, and basic mounting. The SCJ50X140-50S adds a 50 mm adjustment range and a built-in sensor magnet, which the standard SC may not have.
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