The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X160-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø250mm bore, 160mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X160-75 is a heavy-duty, double-acting single-rod pneumatic cylinder from AirTAC, engineered for applications requiring substantial force and on-machine stroke tuning. With a 250 mm bore and a nominal 160 mm stroke, this model delivers a powerful 24544 N of push force at just 0.5 MPa, making it suitable for pressing, clamping, and lifting large assemblies. The defining feature is its rear-cap adjusting screw, which provides up to 75 mm of stroke-end reduction, allowing operators to fine-tune the piston's stopping position in the field without disassembling the cylinder or adding external hard stops.
This ISO 6430 class tie-rod cylinder uses a robust 50 mm diameter piston rod with an M42x2 thread and features a 40 mm adjustable air cushion to decelerate high-inertia loads smoothly. The body length (A dimension) is 409 mm, and the standard PT 1-inch ports supply the large air volume needed for consistent cycling. Operating across a 0.15-1.0 MPa pressure range, the SCJ250X160-75 provides a maximum theoretical force of 5006 kgf, ensuring it can handle the most demanding industrial tasks.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X160-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 160 mm |
| Stroke adjustment | Up to 75 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. |
| ×160 | Nominal (maximum) stroke length in mm. |
| -75 | 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 75 mm adjustment range is ideal for dialing in the exact pressing depth on a new hydraulic-pneumatic press during setup, allowing engineers to incrementally increase the stroke end without changing tooling.
Fine-tune the extension of a reject gate on a heavy-duty conveyor line. The adjustable stroke lets operators compensate for wear on the gate mechanism over time, maintaining a perfect seal without reprogramming the line.
Use the rear adjusting screw to set the final clamp position on a large injection mold. This allows for quick format changes between different mold heights, significantly reducing changeover time in high-mix production environments.
Select the SCJ250X160-75 when your application demands a force output in the 24544 N range at standard shop air pressure, combined with the flexibility to adjust the stroke end by up to 75 mm. If your force requirement is lower, stepping down to a 200 mm bore reduces the push force to 15708 N at 0.5 MPa, offering a more compact and energy-efficient solution. For applications needing a fixed, non-adjustable stroke, the standard SC series is a more economical choice, while a guided cylinder should be specified if the load introduces significant side forces that could bend the 50 mm rod.
For a direct replacement, match this model with another AirTAC SCJ adjustable-stroke cylinder of the same 250 mm bore, 160 mm nominal stroke, and -75 adjust range, ensuring the port thread is PT. This basic configuration uses no mounting accessories, so any replacement must be ordered with the same bare-cylinder setup. For strokes of this length, always ensure the load is guided externally to prevent rod deflection and premature seal wear.
Adjustable-stroke checklist
The output force depends on the operating pressure. At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force increases to 44178 N. The theoretical maximum force at 1.0 MPa is 5006 kgf. Note that push force is greater than pull force due to the area of the single piston rod.
A rear-cap adjusting screw lets you shorten the stroke end by up to 75 mm from the nominal 160 mm maximum. This is perfect for applications where the exact stopping position needs to be tuned on the machine, such as during commissioning, format changeovers, or to take up mechanical wear. Choose the SCJ if you need this field adjustability. If your stroke length is fixed and will never need in-situ tuning, the standard SC series is a more cost-effective option.
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