Airtac SCJ50 Standard Cylinder SCJ50X70-50
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X70-50 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, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke70 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X70-50
The SCJ50X70-50 is a double-acting, single-rod pneumatic cylinder that delivers 982 N of push force at 0.5 MPa, making it a solid mid-range actuator for industrial automation. Its defining feature is a rear-cap adjusting screw that provides up to 50 mm of field-adjustable stroke-end control, allowing you to fine-tune the piston's stopping position without replacing the cylinder or adding external hard stops.
Built on a durable tie-rod construction with a 20 mm diameter piston rod and PT1/4 ports, this cylinder includes an adjustable air cushion (21 mm length) to decelerate the load smoothly. With a body length A of 194 mm, it is slightly longer than the fixed-stroke SC equivalent to accommodate the adjustment mechanism, offering a practical solution for commissioning trials and format changeovers.
Airtac SCJ50 Standard Cylinder SCJ50X70-50 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X70-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 70 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 SCJ50X70-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×70 | 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 SCJ50X70-50 Is Used
Commissioning & Setup
The 50 mm adjustment screw allows technicians to precisely dial in the stroke end position during machine commissioning, eliminating the need to shim or reposition the cylinder body.
Product Changeover
Quickly adapt a pusher or stop gate to different product sizes on a packaging line by turning the rear screw, reducing downtime between batch runs.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear on tooling or seals over time, maintaining consistent contact pressure without reprogramming.
Is the Airtac SCJ50 Standard Cylinder SCJ50X70-50 the Right Cylinder?
Step up to the 63 mm bore SCJ if your application requires more force, as it provides 1559 N of push at the same 0.5 MPa pressure. If your stroke length is fixed and will never need in-field adjustment, the standard SC50 series offers a more compact and cost-effective alternative. For applications where the rod must support a significant side load, consider adding an external linear guide or switching to a guided cylinder, as the SCJ's rod bearing is designed for axial thrust.
This model is a direct dimensional replacement for another AirTAC SCJ50 cylinder with a 70 mm nominal stroke, a 50 mm adjustment range, PT ports, and basic mounting. To upgrade with sensor feedback, specify the -S magnet option; for pivoting loads, the TC centre trunnion mount with the F-SC50TC bracket is the correct choice.
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 SCJ50X70-50 FAQ
At the standard operating pressure of 0.7 MPa, this cylinder produces 1374 N of push force and 1155 N of pull force. The maximum push force at 1.0 MPa is 1767 N. The pull force is lower due to the area of the 20 mm piston rod.
Yes, the SCJ50X70-50 can replace an SC50X70 if you have space for the slightly longer body and need the adjustable stroke feature. The port sizes, rod thread (M16x1.5), and mounting accessories like FA and LB are identical, but ensure the 50 mm adjustment range suits your process.
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