The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø50mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X125-100S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides a 100 mm adjustment range, letting you dial in the exact stop position without changing the cylinder or adding external hard stops. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force at 0.5 MPa, making it a solid mid-range actuator for tasks that need repeatable, field-adjustable positioning.
This model includes a built-in magnet (denoted by the -S suffix), so you can clamp CMSG, DMSG, or EMSG reed and solid-state sensors directly onto the tie-rod barrel for end-of-stroke or mid-stroke position feedback. The body length A(SCJ) is 194 mm, and the adjustable air cushion helps decelerate the piston smoothly. Operating pressure runs from 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa, and the standard TPU seal handles temperatures from -20 to +70 °C.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 100 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. |
| -100 | 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 100 mm adjustment screw lets technicians quickly dial in the exact stroke end during machine commissioning, eliminating the need to swap cylinders or fabricate custom stops when fine-tuning a new automation cell.
On packaging or assembly lines running multiple product sizes, the adjustable stroke allows operators to reposition an end-stop or pusher in seconds. The built-in magnet provides sensor confirmation of the new position without mechanical rework.
In high-cycle clamping or pressing fixtures, the stroke end can be gradually extended via the rear screw to compensate for tooling or pad wear, maintaining consistent contact force without interrupting production for a cylinder swap.
Choose the SCJ50X125-100S when you need a mid-force cylinder with a generous 100 mm stroke-end adjustment window for commissioning or format changes. If 982 N of push at 0.5 MPa is slightly low, stepping up to the 63 mm bore (SCJ63, 1559 N push) adds force without a large footprint increase; if you need a lighter, more compact unit, the 40 mm bore (SCJ40, 628 N push) may be a better fit. For applications that do not require stroke adjustability, the fixed-stroke SC50 series offers a simpler, more cost-effective alternative. If side-loading is a concern at this 125 mm stroke, consider an external guide rail or a guided cylinder to protect the rod bearing.
As a direct replacement, this unit matches any AirTAC SCJ50X125-100S with PT ports, basic mounting, and a built-in magnet. Verify that the 100 mm adjustment range, port size (PT1/4), and sensor compatibility match your current setup.
Adjustable-stroke checklist
The adjustment screw only sets the stroke end position; it does not alter the cylinder's output force. At the standard 0.5 MPa operating pressure, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1767 N.
Yes, provided the mounting and porting match. The SCJ50X125-100S has the same 50 mm bore, PT1/4 ports, and tie-rod body as the fixed-stroke SC50 series. The key difference is the rear adjusting screw, which adds the 100 mm stroke-end adjustment range. Ensure your machine has clearance for the slightly longer SCJ body (194 mm A-length) and that the adjustable stroke feature is compatible with your process.
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