Airtac SCJ50 Standard Cylinder SCJ50X75-50
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X75-50 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke75 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X75-50
The SCJ50X75-50 is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal stroke of 75 mm. A rear-cap adjusting screw provides a 50 mm stroke-end adjustment range, allowing machine builders to fine-tune the piston's end position on the fly without swapping the cylinder. At 0.5 MPa, it delivers 982 N of push force and 825 N of pull force, suiting it for moderate clamping, pressing, and positioning tasks where final stroke length needs in-situ calibration.
This tie-rod cylinder features a 20 mm diameter piston rod with an M16x1.5 male thread and PT1/4 ports. The adjustable air cushion, with a 21 mm cushion length, decelerates the piston smoothly at the end of travel. The body length A(SCJ) is 194 mm, making it slightly longer than a fixed-stroke SC of the same bore. It operates on 40 µm filtered air at pressures from 0.15 to 1.0 MPa and speeds of 30-800 mm/s.
Airtac SCJ50 Standard Cylinder SCJ50X75-50 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X75-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 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 SCJ50X75-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SCJ50X75-50 Is Used
End-Stop Calibration
The 50 mm adjustment range allows operators to precisely dial in the stroke end position during machine setup, compensating for variations in workpiece thickness or fixture placement without mechanical stops.
Wear Compensation
In repetitive pressing or clamping operations, the adjustable screw can be used to take up mechanical play or tooling wear over time, maintaining consistent contact pressure without replacing the actuator.
Format Changeovers
For packaging or assembly lines that handle multiple product sizes, the stroke can be quickly re-adjusted to suit a new format, reducing changeover time compared to swapping fixed-stroke cylinders.
Is the Airtac SCJ50 Standard Cylinder SCJ50X75-50 the Right Cylinder?
Choose the SCJ50X75-50 when your application requires a 50 mm bore but the final stroke length may need adjustment during commissioning or after tooling wear. If 982 N of push force at 0.5 MPa is insufficient, stepping up to an SCJ63 bore provides 1559 N of push force. If a fixed, non-adjustable stroke is acceptable, the standard SC50 series offers a simpler, more compact solution. For direct replacement, match the bore, the 75 mm nominal stroke, the 50 mm adjustment range, PT port thread, basic mounting, and the lack of a magnet.
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 SCJ50X75-50 FAQ
At 0.5 MPa, the cylinder provides 982 N of push force (using the full bore area) and 825 N of pull force (subtracting the 20 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force is 200 kgf.
Yes, if you need the added 50 mm stroke-end adjustment. The SCJ50 shares the same bore, rod size, and port threads as the SC50. Ensure the nominal stroke, mounting style, and magnet option match your existing setup. The SCJ body is slightly longer to accommodate the adjusting mechanism.
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