Airtac SCJ50 Standard Cylinder SCJ50X20-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X20-20S 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, 20mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke20 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X20-20S
The SCJ50X20-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston's stopping position by up to 20 mm without swapping the unit. Its 50 mm bore and 20 mm rod deliver 982 N of push force at 0.5 MPa, making it a compact powerhouse for short-throw, high-repeatability tasks.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto 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 20 mm rod smoothly at each end of travel.
Airtac SCJ50 Standard Cylinder SCJ50X20-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X20-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 20 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 SCJ50X20-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×20 | 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 SCJ50X20-20S Is Used
Sensor Flag Adjustment
Fine-tune the end-of-stroke position for a sensor flag or trip dog during machine commissioning, using the -20 mm rear adjusting screw to dial in the exact trigger point without moving the sensor rail.
Short-Stroke Clamping
Apply a controlled 982 N clamping force in a compact fixture. The adjustable stroke lets you set the final clamp position precisely to accommodate slight variations in workpiece thickness.
Diverter Gate Actuation
Actuate a small diverter gate on a conveyor. The built-in magnet confirms gate position, while the stroke adjuster compensates for mechanical wear on the gate stop over thousands of cycles.
Is the Airtac SCJ50 Standard Cylinder SCJ50X20-20S the Right Cylinder?
Choose the SCJ50X20-20S when you need a short, precisely tunable stroke with sensor feedback. If more force is required, stepping up to the 63 mm bore provides 1559 N of push at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. This cylinder is a direct replacement for another AirTAC SCJ of identical 50 mm bore, 20 mm nominal stroke, -20 mm adjust range, PT port thread, and built-in magnet.
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 SCJ50X20-20S FAQ
A screw in the rear cap acts as an internal stop for the piston, shortening the stroke end by up to 20 mm. The nominal 20 mm stroke is the maximum; you can reduce it to any length within that 20 mm range by turning the screw, without affecting the 982 N push force at 0.5 MPa.
Yes, the -S suffix means it has a built-in magnet. You can mount AirTAC CMSG, DMSG, or EMSG sensors directly on the cylinder's tie rods to get a solid-state or reed-switch signal at any point along the adjusted stroke.
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