Airtac SCJ50 Standard Cylinder SCJ50X125-30
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø50mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke125 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X125-30
The SCJ50X125-30 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family. With a 50 mm bore and a 20 mm diameter piston rod, it delivers 982 N of push force and 825 N of pull force when operated at 0.5 MPa. The defining feature is the rear-cap adjusting screw, which provides up to 30 mm of field-adjustable stroke reduction, allowing engineers to fine-tune the end position without removing the cylinder from the machine.
This model has a nominal stroke of 125 mm and a body length (A dimension) of 194 mm plus stroke. It uses PT1/4 ports and an M16x1.5 rod thread, with an adjustable air cushion of 21 mm at each end to decelerate the piston smoothly. The standard operating pressure ranges from 0.15 to 1.0 MPa, and the cylinder is fitted with a durable TPU seal suitable for temperatures from -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X125-30 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 30 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 SCJ50X125-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ50X125-30 Is Used
Commissioning & Setup
The 30 mm rear adjuster allows technicians to walk the cylinder end-stop into the exact position during initial machine setup, eliminating the need for shims or custom hard stops.
Product Format Changeover
Quickly adapt the stroke end to handle different product sizes on a packaging line or sorting conveyor without swapping out the cylinder, minimizing downtime between batches.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be extended slightly over time to compensate for pad wear or material compression, maintaining consistent clamping force.
Is the Airtac SCJ50 Standard Cylinder SCJ50X125-30 the Right Cylinder?
Choose the SCJ50X125-30 when you need a mid-range force actuator with the ability to dial in the stroke end precisely during commissioning or changeovers. If your application requires more force, stepping up to a 63 mm bore provides 1559 N of push force at the same 0.5 MPa pressure. For applications needing a fixed, non-adjustable stroke, the standard SC50 series offers a simpler, more compact alternative without the rear screw mechanism. This cylinder is a direct replacement for any AirTAC SCJ50 cylinder with a 125 mm nominal stroke and a 30 mm adjustment range, using PT ports and basic mounting. For strokes of this length, ensure the rod is adequately supported against side loads; if lateral forces are present, consider adding an external guide rail or switching to a guided cylinder assembly.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X125-30 FAQ
A screw in the rear cap acts as an internal stop for the piston, allowing you to shorten the stroke end by up to 30 mm. The 125 mm in the model code is the maximum nominal stroke; turning the screw reduces the effective stroke from that maximum. It adjusts the end position only and does not change the cylinder's force output.
At the standard operating pressure of 0.5 MPa, the push force is 982 N and the pull force is 825 N. The pull force is lower because the rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1964 N.
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