Airtac SCJ250 Standard Cylinder SCJ250X250-20
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X250-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø250mm bore, 250mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke250 mm
- Stroke adjust-20 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X250-20
The SCJ250X250-20 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family, built on a robust tie-rod construction. With a 250 mm bore and a 250 mm nominal stroke, its defining feature is the rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction, allowing fine-tuning without cylinder removal. At 0.5 MPa, it delivers a substantial 24544 N of push force (23562 N pull), classifying it as an ISO 6430 class big-bore actuator.
The cylinder uses a 50 mm diameter piston rod with an M42x2 thread and PT 1 inch ports. Its adjustable pneumatic cushion, with a 40 mm cushion length, decelerates the piston smoothly at the stroke end. The body length A for this SCJ model is 409 mm, and it is rated for a maximum standard stroke of 1500 mm, operating on 40 µm filtered air at 0.15-1.0 MPa.
Airtac SCJ250 Standard Cylinder SCJ250X250-20 Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X250-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 20 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 SCJ250X250-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ250X250-20 Is Used
Heavy Press End-Stop Tuning
Fine-tune the bottom dead center of a large forming press. The 20 mm rear screw adjustment allows operators to compensate for tooling wear or different material thicknesses without disassembling the press, maximizing uptime.
Palletizer Layer Positioning
Adjust the final push stroke of a palletizer layer-squaring arm. The adjustable stroke end ensures consistent, gentle contact with different load sizes, preventing product damage while maintaining precise layer alignment.
Damper Gate Calibration
Calibrate the open position of a large-scale material handling damper gate in a foundry. The 20 mm adjustment range allows for precise flow control setup during commissioning, which can be easily tweaked as the system beds in.
Is the Airtac SCJ250 Standard Cylinder SCJ250X250-20 the Right Cylinder?
Choose the SCJ250X250-20 when a high-force, field-tunable stroke end is critical for commissioning or process changeover. If the 24544 N push force at 0.5 MPa is more than required, stepping down to a 200 mm bore SCJ reduces it to 15708 N, saving energy and space. For applications needing a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. A direct replacement must match the 250 mm bore, 250 mm nominal stroke, 20 mm adjust range, PT 1 inch ports, and basic mounting.
For this 250 mm stroke length, be mindful of side-loading which can cause rod bending and premature seal wear. If the load is not guided externally, use an external guide rail or switch to a guided cylinder to ensure the rod operates in pure axial tension and compression.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ250X250-20 FAQ
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. The pull force is lower due to the area of the 50 mm piston rod. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N.
Yes, the SCJ250X250-20 is dimensionally compatible as a replacement where the 20 mm stroke adjustment feature is needed. The body length is slightly longer to accommodate the adjusting screw. Ensure the port thread (PT 1 inch), mounting style, and magnet option match your existing setup.
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