Airtac SCJ50 Standard Cylinder SCJ50X80-50S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X80-50S 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke80 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X80-50S
The SCJ50X80-50S delivers 982 N of push force at 0.5 MPa from its 50 mm bore, with a field-adjustable stroke end that can be shortened by up to 50 mm via the rear-cap screw. This single-rod, double-acting tie-rod cylinder uses a 20 mm diameter rod and PT1/4 ports, making it a direct fit for tasks where the final stroke length needs dialling in on the machine without swapping the cylinder.
At 0.9 MPa the push force reaches 1767 N, while the pull force is 825 N at 0.5 MPa due to the rod area. The built-in magnet allows CMSG, DMSG, or EMSG sensors to clamp directly onto the barrel for reliable end-of-stroke detection. The 21 mm air cushion at each end decelerates the piston smoothly, and the body length A is 194 mm plus the 80 mm nominal stroke.
Airtac SCJ50 Standard Cylinder SCJ50X80-50S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X80-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 80 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 SCJ50X80-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SCJ50X80-50S Is Used
Commissioning Fine-Tuning
During machine setup, the 50 mm rear adjustment screw lets technicians precisely dial in the stroke end position without removing the cylinder, saving hours of mechanical rework.
Product Format Changeover
On packaging lines, the adjustable stroke allows a single pusher station to handle different box sizes by simply turning the rear screw to change the push distance.
Wear Compensation
In clamping or pressing fixtures, the stroke can be incrementally extended over time to compensate for tooling wear, maintaining consistent contact force without replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X80-50S the Right Cylinder?
Choose this 50 mm bore when the 40 mm SCJ (628 N push at 0.5 MPa) is too light, but a 63 mm unit (1559 N push) would be oversized. The 50 mm adjustable range is ideal for commissioning trials or format changeovers where the exact stroke stop position is unknown at design time. If you later need a fixed, non-adjustable stroke, the standard SC50 series offers the same mounting and force characteristics.
For a direct replacement, match the 50 mm bore, 80 mm nominal stroke, 50 mm adjust range, PT ports, basic mounting, and the -S magnet option. The rod thread is M16x1.5. If the application involves significant side loads, consider an external guide rail or a guided cylinder, as the rod is not designed to bear lateral forces.
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 SCJ50X80-50S FAQ
At the standard 0.5 MPa operating pressure, the push force is 982 N and the pull force is 825 N. The maximum push force at 0.9 MPa is 1767 N. The pull force is lower because the 20 mm rod reduces the effective piston area on the return stroke.
Yes, if the mounting and port configuration match. The SCJ50X80-50S has the same 50 mm bore, PT1/4 ports, and basic mounting as an SC50, but adds a rear adjusting screw that lets you shorten the stroke end by up to 50 mm. Ensure the longer body length (194 mm + stroke) fits your space.
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