Airtac SCJ50 Standard Cylinder SCJ50X80-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X80-20S 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke80 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X80-20S
The SCJ50X80-20S is a double-acting, single-rod pneumatic cylinder from AirTAC's adjustable-stroke series, delivering 982 N of push force at 0.5 MPa. Its defining feature is a rear-cap adjusting screw that provides up to 20 mm of stroke-end reduction, letting you fine-tune the piston's stopping position on the fly without swapping the cylinder. With a 20 mm diameter piston rod and PT1/4 ports, this 50 mm bore unit handles operating pressures from 0.15 to 1.0 MPa.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors on the tie-rod barrel for reliable end-of-stroke detection. The body length A(SCJ) is 194 mm, and the adjustable air cushion decelerates the piston smoothly at both ends. It is a genuine AirTAC component, built for repeatable performance in commissioning and format-change applications where stroke length needs field validation.
Airtac SCJ50 Standard Cylinder SCJ50X80-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X80-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 80 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 SCJ50X80-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SCJ50X80-20S Is Used
Commissioning & Setup
During machine commissioning, the 20 mm adjustment range lets technicians precisely dial in the actuator's end-stop without fabricating shims or moving hard stops, speeding up the debug phase.
Format Changeover
On packaging or sorting lines, the adjustable stroke allows operators to quickly reset the pusher stroke for different box or product sizes, minimizing downtime between batches.
Wear Compensation
In clamping or pressing fixtures, the screw can be advanced over time to compensate for tooling wear or material compression, maintaining consistent contact force without reprogramming the machine.
Is the Airtac SCJ50 Standard Cylinder SCJ50X80-20S the Right Cylinder?
Choose the SCJ50X80-20S when your application requires a 50 mm bore with roughly 982 N of push force and the ability to dial in the stroke end by up to 20 mm. If you need more force, stepping up to the 63 mm bore (SCJ63 series) provides 1559 N of push at the same 0.5 MPa pressure. For a fixed, non-adjustable stroke, the standard SC50X80 cylinder is a simpler alternative. This unit is a direct dimensional replacement for another AirTAC SCJ50 cylinder with an 80 mm nominal stroke, 20 mm adjust range, PT ports, and a magnet, provided the mounting style matches. For strokes of 80 mm, side-loading is generally minimal, but always align the rod with the load axis to prevent premature seal wear.
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 SCJ50X80-20S FAQ
At the standard 0.5 MPa operating pressure, the cylinder delivers 982 N of push force (extending) and 825 N of pull force (retracting). The difference is due to the single-rod design, where the rod occupies area on the piston's pull side.
You can, provided the 194 mm body length fits your space and you need the 20 mm stroke-end adjustment. The SCJ50X80-20S shares the same bore, 80 mm nominal stroke, PT1/4 ports, and mounting accessories (Basic, FA, LB, TC) as the SC series, but adds the rear adjusting screw and built-in magnet for sensors.
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