Airtac SCJ50 Standard Cylinder SCJ50X120-75S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X120-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 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-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X120-75S
The SCJ50X120-75S is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that lets you fine-tune the stroke end position within a 75 mm range without changing the cylinder. This model delivers 982 N of push force at 0.5 MPa and up to 1767 N at the maximum operating pressure of 0.9 MPa, making it a robust actuator for mid-range applications.
With a 20 mm diameter rod and PT1/4 ports, this cylinder includes a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors. The adjustable cushioning and 194 mm body length provide a compact yet versatile solution where field-adjustable stroke is essential.
Airtac SCJ50 Standard Cylinder SCJ50X120-75S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X120-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 75 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 SCJ50X120-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ50X120-75S Is Used
Commissioning Trials
Fine-tune the end stop during machine setup to achieve perfect alignment without swapping cylinders or adding external hard stops.
Format Changeover
Quickly adjust the stroke for different product sizes on a packaging line, reducing downtime between batches.
Wear Compensation
Take up mechanical wear in a clamping or pressing fixture by incrementally extending the stroke end position.
Is the Airtac SCJ50 Standard Cylinder SCJ50X120-75S the Right Cylinder?
Choose the SCJ50X120-75S when you need to dial in a precise stroke end during commissioning or changeovers. If 982 N of push force at 0.5 MPa is insufficient, stepping up to the 63 mm bore provides 1559 N. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a more economical choice. A direct replacement must match the 50 mm bore, 120 mm nominal stroke, 75 mm adjust range, PT ports, and the -S magnet option. For strokes over 300 mm, consider an external guide to prevent rod bending under side loads.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ 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 SCJ50X120-75S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The maximum push force at the 0.9 MPa operating limit is 1767 N.
A rear-cap screw sets the stroke end, allowing you to shorten the 120 mm nominal stroke by up to 75 mm in the field. It does not adjust the cylinder's force or speed.
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Related AirTAC SCJ Adjustable-Stroke Cylinders
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