Airtac SCJ250 Standard Cylinder SCJ250X250-10
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X250-10 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, 250mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke250 mm
- Stroke adjust-10 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X250-10
The SCJ250X250-10 is a heavy-duty double-acting single-rod cylinder engineered for applications where the stroke end position must be fine-tuned on the machine. Its rear-cap adjusting screw provides a 10 mm adjustable range, letting you dial in the exact stopping point during commissioning or after wear without swapping the cylinder. With a 50 mm diameter piston rod and a 40 mm cushion, this ISO 6430 class tie-rod cylinder delivers controlled deceleration even under substantial side loads.
At 0.5 MPa air pressure, this 250 mm bore cylinder generates 24544 N of push force and 23562 N on the pull stroke, making it suitable for pressing, clamping, and heavy material handling. The body length A(SCJ) is 409 mm, and it operates within a 30-500 mm/s speed range. The standard PT1 inch port and M42x2 rod thread ensure straightforward integration into existing pneumatic circuits, while the TPU seal offers reliable performance from -20 to +70 °C.
Airtac SCJ250 Standard Cylinder SCJ250X250-10 Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X250-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 250 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.
Theoretical Output Force (Ø250mm)
| 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.
Model Code: Airtac SCJ250 Standard Cylinder SCJ250X250-10
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×250 | 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.
Where the Airtac SCJ250 Standard Cylinder SCJ250X250-10 Is Used
Heavy Press Commissioning
Fine-tune the final pressing depth on a 250 mm bore press by adjusting the rear screw up to 10 mm, eliminating the need to shim tooling or reprogram the controller during initial setup.
Material Handling End-Stop
Set the exact retract or extend stop for a heavy-duty pusher on a conveyor line, accommodating slight variations in pallet or workpiece size without changing the cylinder.
Clamp Stroke Take-Up
Compensate for jaw or pad wear in a large-scale clamping fixture by adjusting the stroke end, maintaining consistent clamping force and preventing over-travel on each cycle.
Is the Airtac SCJ250 Standard Cylinder SCJ250X250-10 the Right Cylinder?
Choose the SCJ250X250-10 when you need substantial force and the ability to trim the stroke end by up to 10 mm in the field. If your force requirement is slightly lower, stepping down to the 200 mm bore reduces push force to 15708 N at 0.5 MPa, which may allow a smaller footprint. For applications needing a fixed, non-adjustable stroke, the standard SC250X250 eliminates the rear screw and offers a simpler, more compact solution. This SCJ model is a direct replacement for another AirTAC SCJ250X250-10 with PT ports and basic mounting; ensure the adjust range, port thread, and magnet option match. For this 250 mm stroke length, always assess side-load forces—if the rod is subjected to off-axis loads, pair the cylinder with an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-10)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ250 Standard Cylinder SCJ250X250-10 FAQ
The push force at 0.5 MPa is 24544 N, and the pull force is 23562 N. Because this is a single-rod cylinder, the push force is greater than the pull force due to the rod area. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N.
The rear-cap adjusting screw limits the piston's stroke end position within a 10 mm range, allowing you to fine-tune the stopping point. It does not adjust force or speed. The screw and the air cushion are not locking devices; if you need to hold a load without air pressure, you must add an external mechanical lock or a pilot-operated check valve.
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