The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X125-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø250mm bore, 125mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X125-10S is a heavy-duty double-acting single-rod cylinder with a rear-cap adjusting screw, giving you up to 10 mm of field-adjustable stroke-end retraction. With a 50 mm rod and PT1" ports, this ISO 6430 class tie-rod cylinder delivers 24544 N of push force at just 0.5 MPa, making it suitable for large-scale pressing, clamping, and material handling where fine end-stop tuning is required.
The built-in magnet (-S suffix) allows CMSG/DMSG/EMSG sensors to clamp directly onto the barrel for reliable end-of-stroke detection. The adjustable air cushion decelerates the piston smoothly, and the 40 mm cushion length helps manage the high kinetic energy of this large bore. The body length A(SCJ) is 409 mm, and the standard operating temperature range is -20 to +70 °C.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X125-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 10 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. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -10 | 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.
Fine-tune the bottom-dead-center of a large hydraulic-style pneumatic press by adjusting the rear screw, compensating for tooling wear or material thickness variations without reprogramming the machine.
Dial in the precise push-off distance for a reject gate on a conveyor for large castings. The 10 mm adjust range lets operators quickly correct the stroke end after maintenance or a product changeover.
Set the final clamping position for a large weldment fixture. The adjustable stroke allows commissioning engineers to achieve the exact clamping point, and the built-in magnet provides confirmation that the clamp is fully engaged.
Choose the SCJ250X125-10S when your application demands a high-force actuator with the ability to fine-tune the stroke end position on the machine. If 24544 N of push force at 0.5 MPa is more than needed, stepping down to the 200 mm bore provides 15708 N. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. This cylinder is a direct replacement for another AirTAC SCJ of the same 250 mm bore, 125 mm nominal stroke, 10 mm adjust range, PT port thread, and built-in magnet.
For this 125 mm stroke, side-loading is less of a concern than with longer strokes, but any significant radial force should be managed with an external guide rail to protect the rod and bearing from premature wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder provides 24544 N of push force and 23562 N of pull force. The maximum operating pressure is 1.0 MPa, yielding a theoretical push force of 44178 N. The push force is higher than the pull force because the rod reduces the effective piston area on the return stroke.
A rear-cap screw lets you shorten the stroke end by up to 10 mm without dismounting the cylinder. This is ideal for commissioning, format changeovers, or taking up wear in tooling. Choose the SCJ when you need this field-adjustability. If your stroke is a fixed, unchanging value, the standard SC fixed-stroke cylinder is a more cost-effective choice.
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