Airtac SCJ50 Standard Cylinder SCJ50X120-50S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X120-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke120 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X120-50S
The AirTAC SCJ50X120-50S is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal 120 mm stroke, featuring a rear adjusting screw that provides up to 50 mm of field-adjustable stroke-end reduction. This allows precise fine-tuning of the piston stop position without swapping the cylinder or adding external hard stops, making it invaluable for commissioning and process changeovers. The built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors on the tie-rod barrel for reliable end-of-stroke detection.
With a 20 mm diameter piston rod and PT1/4 ports, this cylinder delivers a push force of 982 N at 0.5 MPa and up to 1767 N at the maximum operating pressure of 0.9 MPa. The pull force is 825 N at 0.5 MPa, reflecting the single-rod design. It features an adjustable air cushion (21 mm length) for smooth deceleration and a body length of 194 mm. The operating speed range is 30-800 mm/s, and it uses standard TPU seals for a temperature range of -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X120-50S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X120-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 50 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 SCJ50X120-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ50X120-50S Is Used
Commissioning & Setup
During machine commissioning, the 50 mm adjustment range allows engineers to experimentally determine the optimal stroke end position for a new process, eliminating the need to stock multiple fixed-stroke cylinders for trial and error.
Format Changeover
On a packaging line that handles different product sizes, the stroke can be quickly adjusted to accommodate a new box height or pallet dimension, significantly reducing changeover time between production runs.
Wear Compensation
In clamping or pressing operations, the adjusting screw can be used to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamp force and position without replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X120-50S the Right Cylinder?
Choose the SCJ50X120-50S when you need to precisely dial in a stroke end position within a 50 mm window on a machine. If your force requirements increase, stepping up to the 63 mm bore SCJ63 series provides a push force of 1559 N at 0.5 MPa. For applications where the stroke length is fixed and never needs field adjustment, the standard SC50 series offers a more economical fixed-stroke alternative. A direct replacement must match the 50 mm bore, 120 mm nominal stroke, 50 mm adjust range, PT port thread, and the integrated magnet for sensor compatibility.
For this 120 mm stroke, side-loading is generally not a primary concern if the load is guided, but any misalignment can cause premature rod bearing wear. If the application involves an unguided or offset load, consider adding an external guide rail or switching to a guided cylinder assembly to protect the rod and seals.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ50X120-50S FAQ
The push force is 982 N at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa. The pull force is lower at 825 N at 0.5 MPa due to the area of the 20 mm piston rod. These forces are identical to a fixed-stroke SC50 cylinder of the same bore.
Yes, you can replace an SC50 with a nominal stroke between 70 mm and 120 mm with this SCJ50X120-50S. The adjustable stroke allows you to fine-tune the end position. Ensure the mounting style, port thread (PT), and magnet option match your existing setup. The SCJ body is slightly longer than a fixed-stroke SC of the same nominal stroke to accommodate the adjusting mechanism.
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