The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X300-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø250mm bore, 300mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X300-30S is a heavy-duty double-acting, single-rod pneumatic cylinder from the AirTAC SCJ series, engineered for applications demanding substantial force and field-adjustable stroke. With a 250 mm bore and a nominal 300 mm stroke, it delivers a powerful push force of 24544 N at 0.5 MPa, while the rear-cap adjusting screw provides up to 30 mm of fine-tuning for the stroke end position, enabling precise setup without cylinder replacement.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod and a PT 1 inch port. The integrated magnet (denoted by the -S suffix) allows for direct mounting of CMSG, DMSG, or EMSG sensors along the barrel for reliable, non-contact position sensing. Its robust design includes an adjustable air cushion (40 mm length) for smooth deceleration, making it ideal for heavy-duty pressing, clamping, and material handling tasks.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X300-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 30 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. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -30 | 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 end stop of a 24,500 N pneumatic press during initial setup and commissioning. The 30 mm adjustment range allows operators to dial in the exact pressing depth for consistent part forming without mechanical shimming.
Set a precise stopping position for heavy pallets on a conveyor line. The adjustable stroke compensates for wear on the stop mechanism over time, maintaining accurate pallet placement with a simple screw adjustment.
Quickly adapt a large clamping fixture for different product sizes. The rear adjusting screw allows a technician to change the closed position of the clamp by up to 30 mm in seconds, drastically reducing downtime during batch changeovers.
Select the SCJ250X300-30S when your application requires a high-force actuator with the ability to fine-tune the stroke end on the machine. If you need even greater force, consider a larger custom solution, as this is the largest standard bore. For applications where a fixed stroke is sufficient and cost is a primary concern, the standard SC250X300 cylinder is a suitable alternative. A direct replacement must match the 250 mm bore, 300 mm nominal stroke, 30 mm adjustment range, PT port thread, and the integrated magnet.
For this 300 mm stroke length, carefully evaluate the potential for side loading on the 50 mm rod. If the load is not guided externally, rod deflection can lead to premature bearing and seal wear. In such cases, incorporate an external guide rail system or consider a guided cylinder assembly to ensure linear motion and protect the actuator.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 24544 N, and the pull force is 23562 N (accounting for the 50 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 44178 N. Always apply a safety factor for real-world dynamic loads.
Yes, the SCJ250X300-30S is a direct dimensional replacement for an SC250X300 when you need the added benefit of field-adjustable stroke. Ensure your mounting and port connections match the PT 1 inch thread, and note the SCJ body is slightly longer to accommodate the adjusting screw mechanism.
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