Airtac SCJ50 Standard Cylinder SCJ50X25-20STC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X25-20STC 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, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke25 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X25-20STC
The SCJ50X25-20STC is a double-acting, single-rod tie-rod cylinder with a rear adjusting screw, allowing the stroke end position to be fine-tuned within a 20 mm range without removing the cylinder. This model delivers 982 N of push force at 0.5 MPa and features a 20 mm diameter piston rod with an M16x1.5 thread, making it a robust solution for applications needing precise end-stop calibration.
Equipped with a built-in magnet and a centre trunnion (TC) mount, this cylinder is ready for sensor feedback via CMSG/DMSG/EMSG switches and is designed to pivot during operation. The PT1/4 ports and TPU seals suit standard compressed air systems, while the 21 mm air cushion at each end ensures smooth deceleration.
Airtac SCJ50 Standard Cylinder SCJ50X25-20STC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X25-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 25 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 SCJ50X25-20STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×25 | 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 SCJ50X25-20STC Is Used
Commissioning & Setup
Ideal for machine builders who need to dial in the exact stroke end position during initial commissioning, eliminating the need to swap cylinders or fabricate external hard stops.
Format Changeover
In packaging or sorting lines, the 20 mm adjustment range allows operators to quickly reconfigure the stroke for different product sizes by simply turning the rear screw, reducing downtime between batches.
Wear Compensation
The adjustable stroke can be used to take up mechanical play or wear in tooling over time, maintaining precise positioning without replacing the actuator or adding shims.
Is the Airtac SCJ50 Standard Cylinder SCJ50X25-20STC the Right Cylinder?
Step up to the 63 mm bore (1559 N push at 0.5 MPa) if the 50 mm bore's 982 N force is marginal for your load. For fixed-stroke applications where field adjustment is unnecessary, the standard SC50 cylinder offers the same mounting and force characteristics without the rear screw. This SCJ model is a direct replacement for another AirTAC SCJ50 cylinder with a 25 mm nominal stroke, 20 mm adjust range, centre trunnion mount, magnet, and PT ports.
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 SCJ50X25-20STC FAQ
At 0.5 MPa, it generates 982 N of push force and 825 N of pull force. The push force is higher because the single piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 1.0 MPa, the push force reaches 1964 N.
Yes, provided the mounting and porting match. The SCJ50X25-20STC has the same 50 mm bore and PT1/4 ports as a standard SC50, but adds a rear adjusting screw for a 20 mm adjustable stroke range. Its body length is slightly longer than a fixed-stroke SC50 of the same nominal stroke to accommodate the mechanism.
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