Airtac SCJ50 Standard Cylinder SCJ50X225-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X225-20 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, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke225 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X225-20
The SCJ50X225-20 is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal 225 mm stroke, featuring a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke reduction. This allows you to fine-tune the stroke end position on the machine without swapping the cylinder, making it ideal for commissioning trials or processes that require periodic end-stop adjustment. At 0.5 MPa, the 20 mm rod delivers 982 N of push force and 825 N of pull force.
This tie-rod cylinder uses a PT1/4 pneumatic port and an M16x1.5 rod thread, with a 21 mm air cushion at each end to decelerate the piston smoothly. The body length A is 194 mm, and the standard operating speed range is 30-800 mm/s. As a genuine AirTAC component, it is built for reliable service in filtered-air systems from -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X225-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X225-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 225 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 SCJ50X225-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×225 | 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 SCJ50X225-20 Is Used
Commissioning & Setup
Fine-tune the stroke end position on a new assembly line without ordering multiple fixed-stroke cylinders. The 20 mm adjustment screw lets technicians dial in the exact stopping point for a pusher or stop gate during initial runoff.
Wear Compensation
In clamping or pressing fixtures, use the adjustable stroke to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamp force without reprogramming the machine controller.
Format Changeover
On a packaging line, quickly adjust the stroke end for different box sizes or product formats. The rear screw provides a repeatable mechanical stop that can be changed by an operator in seconds, reducing downtime between batches.
Is the Airtac SCJ50 Standard Cylinder SCJ50X225-20 the Right Cylinder?
Select the SCJ50X225-20 when you need a 50 mm bore cylinder with a stroke near 225 mm and the ability to dial in the exact end position within a 20 mm range. If your force requirement is lower, stepping down to a 40 mm bore (628 N push at 0.5 MPa) can reduce air consumption and size; for higher force, a 63 mm bore provides 1559 N push at the same pressure. For applications where the stroke is fixed and never needs field adjustment, a standard SC50X225 fixed-stroke cylinder is a simpler, cost-effective alternative.
This cylinder is a direct replacement for another AirTAC SCJ50X225-20 with PT ports and basic mounting. When replacing, ensure the bore, nominal stroke, and the 20 mm adjustable range all match. For strokes of this length, be mindful of side loads on the 20 mm rod; if the load is not guided externally, consider adding an external guide rail or switching 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 (-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 SCJ50X225-20 FAQ
At the standard operating pressure of 0.5 MPa, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. The push force is higher because the rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1964 N.
No. The SCJ50X225-20 is a double-acting cylinder and will not hold its position if air pressure is lost or the directional valve is centered; the piston can drift or drop. The rear adjusting screw only sets the stroke end position and does not act as a mechanical lock. To hold a load safely without live air pressure, you must add an external rod brake, a mechanical lock, or a pilot-operated check valve.
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