The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-10 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, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X450-10 is a heavy-duty double-acting, single-rod pneumatic cylinder that lets you fine-tune the stroke end position by up to 10 mm using the rear adjusting screw, without removing the cylinder from the machine. With a 50 mm diameter piston rod and a substantial 24544 N push force at just 0.5 MPa, it is built for large-scale industrial tasks where precise end-stop calibration is critical during setup or format changes.
This ISO 6430 class tie-rod cylinder features an adjustable air cushion (40 mm length) for smooth deceleration and operates on filtered air from 0.15 to 1.0 MPa. The body length A(SCJ) is 409 mm, and the standard PT 1-inch port supplies the high flow needed for a 250 mm bore. The 10 mm adjustment range is ideal for taking up mechanical wear or fine-tuning the stopping position in high-cycle applications.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 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. |
| ×450 | 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.
During the installation of large material handling gantries, the 10 mm rear screw adjustment lets technicians dial in the exact stop position of a 450 mm stroke without re-plumbing or swapping the cylinder, saving hours of setup time.
In a high-cycle stamping or compaction press, the adjustable stroke end compensates for tooling wear or material thickness variation over time, maintaining consistent part quality with a simple turn of the rear screw.
The SCJ250X450-10 can act as a powerful gate actuator on heavy-duty conveyor lines. The 10 mm adjustment allows operators to fine-tune the gate's closed position for different pallet or product sizes without stopping the line.
Choose the SCJ250X450-10 when your application demands the force of a 250 mm bore (24544 N push at 0.5 MPa) but requires a small, field-adjustable window to perfect the stroke end. If you need more adjustment range, consider a model with a -50 or -75 suffix. For a step down in force, the 200 mm bore SCJ provides 15708 N of push at the same pressure. If your stroke end is fixed and never needs field changes, the standard SC fixed-stroke cylinder is a simpler, more cost-effective alternative.
At a 450 mm nominal stroke, side-loading and rod bending are significant risks. Always guide the load externally with a linear rail system, or switch to a guided cylinder if the application involves any off-axis force. For direct replacement, match the bore (250 mm), nominal stroke (450 mm), 10 mm adjust range, PT port thread, and basic mounting. The SCJ series accepts FA, LB, or TC mounting kits, but no FB flange or clevis brackets.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. The pull force is lower because the 50 mm piston rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5006 kgf.
Yes, provided the bore (250 mm), nominal stroke (450 mm), and port thread (PT 1 inch) match. The SCJ body is slightly longer to house the adjusting mechanism, so check the A(SCJ) dimension of 409 mm against your available space. The rear screw adds the ability to shorten the stroke end by up to 10 mm, which a fixed-stroke SC cannot do.
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