Airtac SCJ50 Standard Cylinder SCJ50X175-20FA
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X175-20FA 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, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke175 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X175-20FA
The SCJ50X175-20FA is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a 175 mm nominal stroke, factory-equipped with a front rectangular flange (FA) for direct panel mounting. Its defining feature is a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke reduction, allowing engineers to fine-tune the end position during commissioning or format changes without removing the cylinder. With a 20 mm diameter piston rod and PT1/4 ports, it delivers 982 N of push force at 0.5 MPa.
This adjustable-stroke design is ideal for applications requiring precise end-point calibration, such as clamping with varying material thicknesses or aligning stops on a conveyor. The cylinder uses a TPU seal for standard operation from -20 to +70 °C and features an adjustable air cushion to decelerate the piston smoothly. The FA mounting, ordered as part F-SC50FA, provides a rigid, face-mounted installation on the rod end, ensuring stable alignment for push applications.
Airtac SCJ50 Standard Cylinder SCJ50X175-20FA Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X175-20FA |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 175 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 SCJ50X175-20FA
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×175 | 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 SCJ50X175-20FA Is Used
End-Stop Calibration
Fine-tune the final position of a pusher arm during machine commissioning. The 20 mm adjustment screw allows operators to compensate for assembly tolerances and achieve precise part placement without reprogramming the controller.
Adjustable Part Stops
Create a field-adjustable stop gate on a conveyor line. When product sizes change, the stroke can be quickly shortened by up to 20 mm to match the new package length, minimizing changeover downtime.
Clamping with Variable Thickness
Use the adjustable stroke to set a safe clamping force on workpieces of varying thickness. The screw sets a hard mechanical limit, preventing the 20 mm rod from over-traveling and damaging delicate parts.
Is the Airtac SCJ50 Standard Cylinder SCJ50X175-20FA the Right Cylinder?
Select the SCJ50X175-20FA when you need a mid-range force actuator with the ability to dial in the stroke end position on the machine. If the 982 N push force at 0.5 MPa is insufficient, stepping up to a 63 mm bore (SCJ63) provides 1559 N of push force. For applications where the stroke is fixed and never needs adjustment, the standard SC50X175 cylinder offers the same force and mounting in a simpler, more cost-effective package. This model is a direct replacement for any AirTAC SCJ50 cylinder with a 175 mm nominal stroke, a 20 mm adjustment range, PT threads, and an FA front flange mount.
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 SCJ50X175-20FA FAQ
The cylinder provides 982 N of push force and 825 N of pull force at 0.5 MPa. The rear adjusting screw only changes the stroke end position within a 20 mm range; it does not alter the cylinder's bore, rod diameter, or output force.
It can replace an SC50 with a 175 mm stroke if you need the 20 mm adjustment feature and have space for the slightly longer body. Ensure your mounting matches the FA front flange (F-SC50FA) and that the PT1/4 ports and M16x1.5 rod thread are compatible with your existing connections.
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