Airtac SCJ50 Standard Cylinder SCJ50X280-50S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X280-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 280mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke280 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X280-50S
The SCJ50X280-50S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides up to 50 mm of retraction from the 280 mm nominal stroke, letting you dial in the exact end position without swapping the cylinder or adding external hard stops. The 20 mm piston rod and PT1/4 ports deliver a push force of 982 N at 0.5 MPa, scaling to 1767 N at the maximum operating pressure of 0.9 MPa.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The body length A(SCJ) is 194 mm plus stroke, and the adjustable air cushion decelerates the piston smoothly at both ends. With a standard operating speed of 30-800 mm/s and filtered-air supply at 0.15-1.0 MPa, it is a robust, field-configurable actuator for general industrial automation.
Airtac SCJ50 Standard Cylinder SCJ50X280-50S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X280-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 280 mm |
| Stroke adjustment | Up to 50 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 SCJ50X280-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×280 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ50X280-50S Is Used
Commissioning & Fine-Tuning
During machine setup, the 50 mm adjusting screw lets technicians incrementally dial in the exact retract position for pick-and-place arms or pushers, eliminating the need to cut and re-drill mounting brackets.
Format Changeover Stops
On packaging lines that handle multiple box sizes, the adjustable stroke allows operators to quickly reset the end stop for different product widths without mechanical rework, reducing downtime between batches.
Wear Compensation in Clamping
In woodworking or assembly jigs where clamp pads wear over time, the rear screw can be advanced to take up the slack, maintaining consistent clamping force without replacing the entire cylinder.
Is the Airtac SCJ50 Standard Cylinder SCJ50X280-50S the Right Cylinder?
Choose the SCJ50 bore when your application needs roughly 1000 N of push force at standard shop air. If you need a smaller footprint and can accept about 628 N, step down to the SCJ40; for heavier tooling requiring around 1559 N, move up to the SCJ63. The 50 mm adjustable stroke range on this -50 variant is ideal for commissioning trials or format changeovers where the retract position must be tuned across a wide window. If your stroke is fixed and you never need field adjustment, the standard SC50 fixed-stroke cylinder is a simpler, lower-cost alternative.
For this 280 mm stroke, be mindful of side loading. At extended length, a free rod end can experience bending moments that reduce seal and bearing life. If the load is not perfectly guided, add an external guide rail or consider a guided cylinder. When replacing an existing unit, match the SCJ50 bore, 280 mm nominal stroke, -50 adjust range, PT port thread, and the built-in magnet; this ensures the sensor brackets and end-stop settings transfer directly.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ50X280-50S FAQ
At 0.5 MPa air pressure, the push force is 982 N and the pull force is 825 N (the difference is due to the single 20 mm rod reducing the piston area on the retract side). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1964 N, though AirTAC recommends a maximum working push of 1767 N at 0.9 MPa.
Yes, provided the original is an AirTAC SCJ series with a 50 mm bore, 280 mm nominal stroke, and a -50 adjustment range. Confirm that the port thread is PT (Rc), the mounting style matches (this is a basic body mount), and that the magnet option (-S) is present if your existing sensors require it. The SCJ is a tie-rod cylinder, so it is not dimensionally interchangeable with ISO 15552 profile cylinders.
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