Airtac SCJ50 Standard Cylinder SCJ50X75-50STC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X75-50STC 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke75 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X75-50STC
The SCJ50X75-50STC is a double-acting, single-rod pneumatic cylinder with a 50 mm bore, a nominal 75 mm stroke, and a 50 mm rear adjusting screw for fine-tuning the stroke end position on the fly. It delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a strong mid-range actuator for applications where stroke length needs to be dialled in precisely during commissioning or changeovers.
This model includes a built-in magnet (-S suffix) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion pivot mount (TC suffix), supplied with the TCM1 bracket (order code F-SC50TC) for applications requiring the cylinder body to swing. The 20 mm diameter piston rod uses an M16x1.5 thread, and the body length A(SCJ) is 194 mm, providing a compact yet powerful package.
Airtac SCJ50 Standard Cylinder SCJ50X75-50STC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X75-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 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 SCJ50X75-50STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SCJ50X75-50STC Is Used
Format Changeovers
The 50 mm adjust range allows operators to quickly reset the stroke end for different product sizes on packaging or labelling machines without swapping the cylinder.
Wear Compensation
In clamping or pressing fixtures, the screw can be advanced to take up mechanical wear on tooling or workpieces, maintaining consistent clamp force over time.
Commissioning & Prototyping
Engineers can empirically determine the optimal stroke length during machine commissioning or on a test rig, then lock the setting for production, avoiding the need for multiple fixed-stroke cylinders.
Is the Airtac SCJ50 Standard Cylinder SCJ50X75-50STC the Right Cylinder?
Choose the SCJ50X75-50STC when you need a 50 mm bore's force class (982 N push at 0.5 MPa) combined with a field-adjustable stroke end. If 982 N is insufficient, stepping up to a 63 mm bore (SCJ63) provides 1559 N of push force. For fixed-stroke applications where no adjustment is needed, the standard SC50 series offers a simpler, more cost-effective solution. This cylinder is a direct replacement for another AirTAC SCJ50 with a 75 mm nominal stroke, 50 mm adjust range, PT ports, centre trunnion mount, and a magnet sensor.
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 SCJ50X75-50STC FAQ
At the standard operating pressure of 0.5 MPa, the cylinder provides 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The adjustable stroke screw does not alter the cylinder's force output.
Yes, this is a direct, form-fit-function replacement for any AirTAC SCJ50 with a 75 mm nominal stroke, a 50 mm adjustment range, PT ports, a centre trunnion (TC) mount, and a magnetic piston. Ensure your existing mounting bracket and sensors are compatible with the TC/TCM1 configuration.
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