Airtac SCJ50 Standard Cylinder SCJ50X30-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X30-20 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, 30mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke30 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X30-20
The SCJ50X30-20 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, built around a 50 mm bore and a 20 mm diameter piston rod. Its rear-cap adjusting screw provides up to 20 mm of stroke-end reduction, letting you dial in the exact 30 mm nominal maximum stroke for commissioning or format changes without swapping the cylinder. The PT1/4 port and M16x1.5 rod thread match standard AirTAC SC-series mounting and tooling.
At 0.5 MPa air pressure, this unit delivers 982 N of push force and 825 N on the pull stroke, placing it in a mid-range force class suitable for pressing, clamping, and eject tasks. The body length A(SCJ) is 194 mm, slightly longer than the fixed-stroke SC version to house the adjustment mechanism. An integrated 21 mm air cushion decelerates the piston quietly at end of travel, and the operating range spans 0.15–1.0 MPa with filtered air.
Airtac SCJ50 Standard Cylinder SCJ50X30-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X30-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 30 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 SCJ50X30-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×30 | 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 SCJ50X30-20 Is Used
End-Stop Commissioning
During machine setup, the 20 mm adjustment screw lets technicians fine-tune the retract or extend stop position in seconds, eliminating the need to shim or reposition the entire cylinder.
Small-Part Clamping
The 982 N push force at 0.5 MPa is ideal for holding small components in a fixture. The adjustable stroke compensates for slight variations in part thickness or fixture wear over time.
Diverter Gate Actuation
Use the SCJ50X30-20 to swing a diverter gate on a conveyor. The 30 mm stroke provides the throw, while the screw adjusts the gate's closed position precisely against a mechanical stop.
Is the Airtac SCJ50 Standard Cylinder SCJ50X30-20 the Right Cylinder?
Step up to the 63 mm bore SCJ63 if your application needs more force—it provides 1559 N push at 0.5 MPa. Conversely, the 40 mm bore SCJ40 (628 N push) saves space and air when the load is lighter. If your stroke never needs field adjustment, the fixed-stroke SC50 is a simpler, shorter alternative. For a drop-in replacement, match the 50 mm bore, 30 mm nominal stroke, 20 mm adjustable range, PT port thread, and any mounting accessory; the genuine AirTAC SCJ50X30-20 is the direct equivalent.
At 30 mm stroke, rod bending from side loads is rarely a concern, but always align the rod with the load axis. For guided motion, pair this cylinder with an external linear guide or consider a guided cylinder series.
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 SCJ50X30-20 FAQ
At the standard 0.5 MPa operating pressure, it generates 982 N pushing and 825 N pulling. The maximum push force at 0.9 MPa is 1767 N. Because it is a single-rod cylinder, push force is always higher than pull force due to the rod area.
A rear-cap screw lets you shorten the stroke end by up to 20 mm without dismounting the cylinder. Choose the SCJ when you need to fine-tune the end position during setup, accommodate different product sizes, or take up mechanical wear. If your stroke is fixed and never needs field adjustment, the standard SC50 is a more compact choice.
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