The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø250mm bore, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCJ250X350-100 is a large-bore, double-acting single-rod cylinder with a 100 mm rear-cap adjusting screw for fine-tuning the stroke end position. With a 50 mm diameter rod and 1-inch PT ports, it delivers a substantial 24544 N of push force at 0.5 MPa, making it suitable for heavy-duty clamping and pressing applications where the final position needs field adjustment.
The body length A measures 409 mm, and the pneumatic cushion is 40 mm long to decelerate high-inertia loads. This adjustable-stroke design allows operators to dial in the exact stroke end without swapping the cylinder, saving commissioning time on large-scale tooling.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 100 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. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -100 | 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 forming press during die setup, using the 100 mm adjustment to compensate for tooling wear or different material thicknesses.
Adjust the clamping stroke on a structural welding fixture to accommodate varying assembly tolerances, ensuring consistent pressure without over-stroking.
Set a precise end-stop for a heavy-duty pusher on a conveyor line, allowing quick changeover between product sizes with the turn of a screw.
For applications needing more force, the SCJ250 is the largest bore in the SCJ family, offering up to 44178 N of push at 0.9 MPa. If a fixed stroke is acceptable, the standard SC250 provides the same bore and rod dimensions without the adjusting mechanism. When mounting this cylinder, consider using external guides or a guided cylinder for long 350 mm strokes to manage side loads and prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, it generates 24544 N of push force and 23562 N of pull force due to the 50 mm rod. The maximum theoretical force at 1.0 MPa is 5006 kgf.
Yes, if you need field-adjustable stroke. The SCJ250X350-100 matches the SC250 bore and rod but adds a rear adjusting screw. Ensure your mounting and porting (PT 1 inch) are compatible.
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