Airtac SCJ50 Standard Cylinder SCJ50X250-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-20 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. Ø50mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke250 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X250-20
The SCJ50X250-20 delivers a field-adjustable stroke end within a 20 mm range, letting you dial in the exact stopping point without swapping cylinders or adding hard stops. Its 50 mm bore generates 982 N of push force at 0.5 MPa (1767 N at 0.9 MPa), driven by a 20 mm diameter piston rod through PT1/4 ports.
This tie-rod cylinder uses an adjustable rear-cap screw to shorten the nominal 250 mm stroke, making it ideal for commissioning trials, format changeovers, and wear take-up. The body length A(SCJ) is 194 mm, and the air cushion is 21 mm long, providing smooth deceleration near the stroke end.
Airtac SCJ50 Standard Cylinder SCJ50X250-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SCJ50 Standard Cylinder SCJ50X250-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | 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 SCJ50 Standard Cylinder SCJ50X250-20 Is Used
Commissioning & Setup
Dial in the precise end-stop during machine commissioning. The 20 mm rear adjustment lets technicians fine-tune the actuator's throw without removing the cylinder from the line.
Format Changeover
Quickly adapt a packaging machine to a new box size. The adjustable stroke end accommodates different product lengths without needing to swap out the 50 mm bore cylinder.
Wear Compensation
Take up mechanical play in a clamping or pressing fixture over time. A simple turn of the rear screw restores the exact clamping position, extending the tooling's service life.
Is the Airtac SCJ50 Standard Cylinder SCJ50X250-20 the Right Cylinder?
Choose the SCJ50X250-20 when you need to fine-tune the end position of a 250 mm stroke on the machine. For lighter loads, the 40 mm bore (628 N push at 0.5 MPa) saves space; for heavier work, step up to the 63 mm bore (1559 N push at 0.5 MPa). If your application requires a fixed, non-adjustable stroke, the standard SC series is a simpler and more economical alternative.
For a direct replacement, match the 50 mm bore, 250 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting. At this stroke length, ensure the rod is guided externally if significant side loads are present, or consider a guided cylinder to prevent rod bending.
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 SCJ50 Standard Cylinder SCJ50X250-20 FAQ
At the standard operating pressure of 0.5 MPa, it delivers 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The pull force is lower due to the area of the 20 mm piston rod.
Yes, if you need the ability to adjust the stroke end. The SCJ50X250-20 has the same bore, port size (PT1/4), and rod dimensions as an SC50, but its body is slightly longer to house the adjusting screw. Ensure the 20 mm adjustment range is sufficient for your process.
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