The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-50S 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X125-50S is a 50 mm bore double-acting single-rod cylinder offering a field-adjustable stroke end via a rear-cap screw. With a nominal stroke of 125 mm and a 50 mm adjustment range, the effective stroke can be fine-tuned on the machine without swapping the cylinder. It delivers a push force of 982 N at 0.5 MPa and 1767 N at 0.9 MPa, using a 20 mm diameter piston rod.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors on the tie-rod barrel for end-of-stroke detection. The standard PT1/4 port and TPU seals suit filtered air from -20 to +70 °C. The body length A(SCJ) is 194 mm, and the pneumatic cushion length is 21 mm to decelerate the piston quietly.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 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. |
| ×125 | 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 adjustment screw allows engineers to dial in the exact stroke end position during machine setup without needing to re-machine hard stops or swap cylinders.
Quickly adapt the stroke of a pusher or diverter for different box sizes on a packaging line, using the sensor-ready magnet to confirm the new position.
In clamping or pressing fixtures, the adjustable stroke can be extended slightly over time to compensate for pad wear, maintaining consistent clamping force.
Choose the SCJ50X125-50S when you need a 125 mm maximum stroke with up to 50 mm of end-position adjustment for commissioning or format changes. If 982 N of push force at 0.5 MPa is insufficient, stepping up to the 63 mm bore provides 1559 N; if space is tight, the 40 mm bore offers 628 N. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a more economical alternative.
This cylinder is a direct replacement for another AirTAC SCJ adjustable-stroke unit with a 50 mm bore, 125 mm nominal stroke, 50 mm adjust range, PT ports, and a magnet. For strokes of 125 mm, rod deflection under side load is minimal, but ensure the load is guided if off-axis forces are present. The basic mounting style requires a rigid, aligned support structure.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N. Because it is a single-rod cylinder, the push force is greater than the pull force.
Yes, if your existing cylinder is an AirTAC SCJ with a 50 mm bore, 125 mm nominal stroke, 50 mm adjustment range, PT ports, and a magnet. Confirm the mounting style matches your current setup; this is a basic mount version without brackets.
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