Airtac SCJ50 Standard Cylinder SCJ50X20-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X20-20 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 SCJ50X20-20
The SCJ50X20-20 is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that lets you fine-tune the stroke end position within a 20 mm range without removing the cylinder. At 0.5 MPa, it delivers 982 N of push force and 825 N on the pull stroke, making it a compact workhorse for light clamping, stopping, and positioning tasks where the final stroke length needs to be dialled in during commissioning.
This 50 mm bore cylinder uses a 20 mm diameter piston rod with an M16x1.5 male thread and PT1/4 ports. The body length (A dimension) is 194 mm, and it includes an adjustable air cushion for smooth deceleration. The standard TPU seals and PT threads suit general-purpose factory air up to 1.0 MPa.
Airtac SCJ50 Standard Cylinder SCJ50X20-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X20-20 |
|---|---|
| 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 SCJ50X20-20
| 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 SCJ50X20-20 Is Used
Commissioning & Setup
The 20 mm adjustment range allows technicians to dial in the perfect stroke end-stop on a new assembly fixture without swapping cylinders or machining hard stops.
Dispensing & Gluing
Fine-tune the retract position of a dispense head to control the exact gap or contact pressure, compensating for tip wear or product variation over a production run.
Wear Take-Up
In clamping or pressing operations, the adjusting screw can be advanced to compensate for pad wear, maintaining consistent clamping force without reprogramming the machine.
Is the Airtac SCJ50 Standard Cylinder SCJ50X20-20 the Right Cylinder?
Choose the SCJ50X20-20 when you need to set the exact stroke end on the machine—ideal for commissioning trials or format changes on small fixtures. If you need more force, the 63 mm bore offers 1559 N push at 0.5 MPa; for a lighter, more compact solution, the 40 mm bore provides 628 N. This model is a direct replacement for another AirTAC SCJ50X20-20 with PT ports and basic mounting.
For strokes of 20 mm, rod buckling is rarely a concern, but if the load has a significant side component, consider an external guide rail. If you do not need the stroke adjustment feature, the fixed-stroke SC50X20 is a simpler alternative.
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 SCJ50X20-20 FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The maximum operating force at 0.9 MPa is 1767 N push. The adjusting screw changes the stroke end position, not the force output.
Yes, this is a genuine AirTAC SCJ50X20-20 with a 20 mm adjustable stroke range, PT1/4 ports, basic mounting, and TPU seals. It is a direct dimensional and functional match for the same model code. Verify your port thread (PT vs G) and magnet option before ordering.
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