The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X250-75 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, 250mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X250-75 is a heavy-duty double-acting single-rod pneumatic cylinder engineered for applications requiring a 250 mm nominal stroke with up to 75 mm of field-adjustable stroke-end reduction. Operating at 0.5 MPa, this 250 mm bore actuator delivers a substantial 24544 N push force and 23562 N pull force, making it suitable for pressing, clamping, and material handling of large components. The rear-cap adjusting screw allows operators to fine-tune the piston stop position without dismounting the cylinder, simplifying commissioning and format changeovers on large-scale machinery.
This ISO 6430 class tie-rod cylinder features a robust 50 mm diameter piston rod with M42x2 threads and a 1-inch PT port for high flow. The body length A is 409 mm, and the unit includes an adjustable air cushion with a 40 mm cushion length to decelerate heavy loads smoothly at end-of-stroke. The standard operating pressure range is 0.15–1.0 MPa, with a proof pressure of 1.5 MPa, ensuring reliable performance in demanding industrial environments.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X250-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 250 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. |
| ×250 | 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.
Fine-tune the pressing depth in large hydraulic-style pneumatic presses by adjusting the rear screw up to 75 mm, accommodating variations in workpiece thickness without reprogramming the machine.
Adjust the end-stop position for heavy pallets on a conveyor line. The 75 mm range allows quick mechanical adjustment for different pallet sizes, ensuring reliable stopping without over-travel.
Set the precise retraction limit for a material guide in a steel processing line. The robust 50 mm rod and 24544 N push force handle high loads, while the adjustable stroke compensates for wear on guide surfaces.
Select the SCJ250 bore when your application demands a push force around 24544 N at standard plant air pressure (0.5 MPa). If your force requirement is closer to 15708 N, stepping down to the 200 mm bore SCJ200 series can reduce physical size and air consumption. For applications where the stroke length never needs adjustment, the fixed-stroke SC250 series offers a simpler, more cost-effective alternative. When replacing an existing unit, match the 250 mm bore, 250 mm nominal stroke, 75 mm adjustment range, and PT port thread to ensure identical mechanical fit and performance.
For this 250 mm stroke, be mindful of side-loading on the 50 mm rod. If the load is not guided externally, the bending moment can cause premature rod bearing and seal wear. In such cases, integrate an external guide rail system or consider a guided cylinder to absorb transverse forces and protect the actuator.
Adjustable-stroke checklist
At 0.7 MPa operating pressure, the SCJ250 bore cylinder generates 34361 N of push force and approximately 32981 N of pull force. The push force is calculated using the full 250 mm bore area, while the pull force subtracts the 50 mm rod cross-section, resulting in a lower value on the return stroke.
Yes, provided the bore (250 mm), nominal stroke (250 mm), and port thread (PT) match. The SCJ250X250-75 has a slightly longer body length A (409 mm) to house the adjusting screw mechanism. Ensure your mounting arrangement has clearance for this extra length and that the 75 mm adjustment range is sufficient for your stroke-end tuning needs.
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