The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X150-20S 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. Ø250mm bore, 150mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X150-20S is a heavy-duty, double-acting single-rod pneumatic cylinder with a field-adjustable stroke, delivering a substantial 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 20 mm of stroke-end reduction, allowing fine-tuning during commissioning or format changes without removing the cylinder. This ISO 6430 class unit uses a 50 mm diameter rod and PT1 inch ports.
Equipped with a built-in magnet (-S suffix), this model is ready for direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the barrel for precise position feedback. The standard TPU seal ensures reliable operation in temperatures from -20 to +70 °C, making it a robust choice for large-scale industrial actuation where the final stroke length needs on-machine calibration.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X150-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 150 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 | 24544 N | 23562 N |
| 0.7 MPa | 34361 N | — |
| Max (@1.0 MPa) | 5006 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. |
|---|---|
| 250 | 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 adjustable stroke allows operators to fine-tune the final position of a heavy-duty press platen or stop gate, compensating for tooling wear or material thickness variations without reprogramming the machine.
In mining or aggregate handling, this cylinder can actuate a diverter chute. The adjustable stroke end enables precise alignment of the chute with different downstream conveyors during system commissioning and maintenance.
Used to set a mechanical stop for roll gaps in metal forming. The rear screw provides a repeatable, micro-adjustable hard stop, delivering the high force needed to hold the position against process loads.
Select the SCJ250 bore class when your application demands a push force around 24544 N at 0.5 MPa. If your force requirement is lower, consider stepping down to the 200 mm bore, which provides 15708 N of push force. For applications requiring a fixed, non-adjustable stroke, the standard SC250 cylinder is the correct alternative. The adjustable stroke is ideal for processes where the end position must be dialed in precisely, such as aligning a heavy stop gate.
A direct replacement must match this model's 250 mm bore, 150 mm nominal stroke, 20 mm adjustable range, PT port thread, and built-in magnet. For this 150 mm stroke, rod buckling is not a primary concern, but always ensure the load is guided and aligned axially to prevent side-loading on the rod bearing. The basic mounting configuration allows for direct integration using the cylinder's body threads.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this single-rod cylinder generates a push force of 24544 N and a pull force of 23562 N. The push force is greater because the rod reduces the effective piston area on the retract side. The maximum push force at 0.9 MPa is 44178 N.
The rear-cap adjusting screw mechanically limits the piston's stroke end by up to 20 mm, allowing you to shorten the nominal 150 mm stroke. It is not a locking device; the piston will drift if air pressure is lost. To hold a load without pressure, you must add an external mechanical lock or a pilot-operated check valve.
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