The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X175-50S 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, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X175-50S is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a 175 mm nominal stroke. A rear-cap adjusting screw provides a 50 mm field-adjustable range, letting you fine-tune the stroke end position without removing the cylinder. At 0.5 MPa, it delivers 982 N of push force and 825 N of pull force, driven by a 20 mm diameter piston rod.
This model includes a built-in magnet (-S suffix), so standard CMSG, DMSG, or EMSG reed and solid-state sensors can be clamped directly onto the tie-rod barrel for reliable end-of-stroke detection. The body length A for this SCJ series is 194 mm, and the adjustable air cushion decelerates the piston smoothly over a 21 mm travel. It uses PT1/4 ports and an M16x1.5 rod thread, operating on filtered air from 0.15 to 1.0 MPa.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X175-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 175 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×175 | 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.
The 50 mm adjust range allows technicians to precisely dial in a machine's stop point during initial build and testing, eliminating the need to swap cylinders or fabricate custom hard stops.
On a packaging line, quickly adjust the push stroke between different box sizes. The built-in magnet allows for sensor-based confirmation that the new stroke end position is being reached.
In pressing or clamping operations, the stroke can be extended by up to 50 mm over time to compensate for wear on tooling or contact surfaces, maintaining consistent process force without replacing the actuator.
Choose the SCJ50X175-50S when you need to dial in a precise stopping position during commissioning or format changes, with a 50 mm adjustment window. If 982 N of push force at 0.5 MPa is insufficient, stepping up to a 63 mm bore provides 1559 N, though the body length increases to 197 mm. For applications that do not require stroke adjustment, a fixed-stroke SC50X175 cylinder is a simpler, more cost-effective alternative.
This cylinder is a direct replacement for another AirTAC SCJ adjustable-stroke unit with a 50 mm bore, 175 mm nominal stroke, 50 mm adjust range, PT ports, and a built-in magnet. For strokes of this length, be mindful of side loads on the 20 mm rod. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
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 due to the single 20 mm rod, providing 825 N at 0.5 MPa. The rear adjusting screw changes only the stroke end position, not the cylinder's force output.
No. As a standard double-acting cylinder, the SCJ50X175-50S will not hold its position if air pressure is exhausted or lost. The air cushion only decelerates the piston at the end of stroke, and the adjusting screw only sets the mechanical stop. To hold a load safely without live pressure, you must add an external rod lock or a pilot-operated check valve.
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