The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X50-20STC 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X50-20STC is a double-acting, single-rod pneumatic cylinder with a 50mm bore and a 50mm nominal stroke, featuring a rear-cap adjusting screw that provides a 20mm field-adjustable range for fine-tuning the stroke end position. With a 20mm diameter piston rod and PT1/4 ports, this cylinder delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a powerful and adaptable actuator for applications requiring precise end-stop calibration without cylinder replacement.
This model is equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion (TC) mount, supplied with the TCM1 bracket, ideal for pivoting applications. The tie-rod construction and adjustable air cushion provide reliable deceleration, while the TPU seals ensure consistent performance within a standard temperature range of -20 to +70°C.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X50-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 50 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. |
| ×50 | 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 20mm adjustable stroke allows technicians to dial in the exact end-stop position during initial machine setup, compensating for minor variations in tooling or workpiece placement without swapping the cylinder.
Ideal for packaging or sorting lines where the push-off or divert stroke needs quick, tool-free adjustment between product runs, minimizing downtime during format changes.
In clamping or pressing applications, the adjusting screw can be used to take up mechanical wear on contact surfaces or seals over time, maintaining consistent clamping force and position.
Select the SCJ50X50-20STC when you need a mid-range force actuator that allows operators to quickly adjust the stroke end position by up to 20mm during commissioning or format changes. If higher force is needed, consider stepping up to the 63mm bore (SCJ63) which provides 1559 N of push force at 0.5 MPa; for a more compact solution requiring less force, the 40mm bore (SCJ40) offers 628 N. This adjustable-stroke model is preferable to a fixed-stroke SC cylinder when the exact working stroke is unknown or may need future modification.
For replacement, match this unit with another SCJ50X50-20STC to ensure identical bore, 50mm nominal stroke, 20mm adjustment range, PT port thread, centre trunnion mounting, and built-in magnet. This model uses the F-SC50TC trunnion kit. Since the stroke is under 300mm, side-loading and rod bending are less critical, but an external guide should still be used if the load is not purely axial.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 50mm bore cylinder generates 982 N of push force on extension. The pull force on retraction is 825 N due to the area reduction from the 20mm piston rod. The maximum push force at 0.9 MPa is 1767 N.
Yes, it can replace an SC50X50, provided the additional body length for the adjusting mechanism is accommodated. The key advantage is gaining a 20mm field-adjustable stroke range. Ensure the replacement matches the PT port thread, TC centre trunnion mount, and magnet sensor option to maintain full compatibility.
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