The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X150-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X150-20S is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a field-adjustable stroke end, allowing you to fine-tune the 150 mm nominal stroke down by up to 20 mm without swapping the unit. Its 20 mm rod diameter and PT1/4 ports deliver a robust 982 N of push force at 0.5 MPa, making it a solid mid-range actuator for tasks needing on-machine stroke calibration.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The adjustable screw is purely a mechanical stroke-end stop and does not alter the cylinder's force output or speed. The body uses the standard SCJ profile with a 194 mm base length, and the adjustable cushion helps decelerate the piston quietly at the end of travel.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X150-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 150 mm |
| Stroke adjustment | Up to 20 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. |
| ×150 | Nominal (maximum) stroke length in mm. |
| -20 | 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 20 mm adjustment screw lets technicians fine-tune the end-stop position during initial machine setup without changing mounting brackets or cylinder models, saving hours of mechanical rework.
On packaging or sorting lines, quickly adjust the push stroke for different box sizes or product formats. The sensor-ready magnet confirms the new position is reached on every cycle.
In clamping or pressing fixtures, the adjustable stroke can take up pad wear over time, maintaining consistent contact force without reprogramming the machine controller.
Choose this 50 mm bore SCJ when you need around 982 N of push force at standard shop air and the ability to dial in the stroke end on the machine. If your load requires more force, stepping up to the 63 mm bore provides 1559 N of push at 0.5 MPa; for a lighter, more compact solution, the 40 mm bore delivers 628 N. This adjustable-stroke model is ideal for commissioning and format changes, but if your stroke is fixed and never needs adjustment, the standard SC50X150 fixed-stroke cylinder is a more economical choice.
For a direct replacement, match the 50 mm bore, 150 mm nominal stroke, 20 mm adjustment range, PT port thread, and the built-in magnet. At a 150 mm stroke, side-loading is generally manageable, but for any off-axis force, use an external guide rail to protect the rod and bearing from premature wear.
Adjustable-stroke checklist
At 0.5 MPa, it generates 982 N of push force and 825 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1767 N. The pull force is lower due to the area of the 20 mm piston rod.
Only if you no longer need the adjustable stroke feature. The SCJ50X150-20S has a rear adjusting screw that sets the stroke end within a 20 mm range. A fixed-stroke SC50 will have a fixed, non-adjustable stroke length, so you would lose the ability to fine-tune the end position on the machine.
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