The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-10 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, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-10 is a large-bore, double-acting single-rod pneumatic cylinder engineered for heavy-duty applications where the stroke end position must be fine-tuned on the machine. Its rear-cap adjusting screw provides a 10 mm variable range, allowing operators to dial in the exact stopping point without replacing the cylinder or adding external hard stops. With a 50 mm diameter piston rod and PT1 inch ports, this ISO 6430 class tie-rod cylinder delivers a substantial 24544 N of push force at 0.5 MPa.
Built for demanding industrial environments, the SCJ250X350-10 features an adjustable air cushion to decelerate high-inertia loads smoothly. The body length A(SCJ) is 409 mm, and the cylinder operates on 40 µm filtered air across a 0.15-1.0 MPa pressure range. Its maximum theoretical push force reaches 44178 N at 0.9 MPa, making it a powerful solution for pressing, clamping, and material handling tasks that require both strength and precise end-position adjustment.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 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. |
| ×350 | 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 setup of a hydraulic-style pneumatic press, the 10 mm rear adjuster allows technicians to fine-tune the final press depth for bearings or bushings, compensating for part tolerance stack-ups without reprogramming the machine.
Used as an end-stop on a conveyor for large steel plates or timber beams, the adjustable stroke lets operators quickly change the stopping position for different product lengths during batch changeovers, using the full 24544 N push force to hold the part.
In a long-cycle clamping fixture for welding large fabrications, the adjusting screw can be advanced over time to take up mechanical wear in the linkage or fixture pads, maintaining consistent clamping force without immediate parts replacement.
Choose the SCJ250X350-10 when your application demands the force of a 250 mm bore—24544 N push at 0.5 MPa—combined with field-adjustable stroke end positioning. If your force requirements are slightly lower, stepping down to a 200 mm bore SCJ offers 15708 N push at 0.5 MPa in a more compact package. For applications where the stroke is fixed and never needs adjustment, a standard SC250X350 cylinder provides the same force output without the rear screw mechanism. Since this is a 350 mm stroke on a large bore cylinder, ensure the rod is adequately supported against side loads; consider an external guide rail or switch to a guided cylinder if the load is not perfectly axial. A direct replacement must match the 250 mm bore, 350 mm nominal stroke, 10 mm adjust range, PT port thread, and basic mounting configuration.
Adjustable-stroke checklist
The output force depends on your air pressure. At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N (reduced due to the 50 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. Always size the cylinder based on the force required at your specific working pressure.
Yes, provided the bore (250 mm), nominal stroke (350 mm), and port thread (PT 1 inch) match. The SCJ body is slightly longer to house the rear adjusting mechanism, so verify the extended length fits your machine. The mounting accessories from the SC series (such as LB foot or TC trunnion) are compatible, but the SCJ does not support FB flange or CA/CB clevis mounts.
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