The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X100-50FA 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. Ø40mm bore, 100mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X100-50FA is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, allowing operators to fine-tune the stopping position by up to 50 mm without replacing the unit. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a practical actuator for medium-duty positioning tasks where mechanical setup varies between runs.
This model includes an FA front rectangular flange (F-SC40FA) for rigid panel or end-face mounting, and uses standard PT ports and TPU seals for reliable operation from -20 to +70 °C. The body length A is 185 mm, and the adjustable screw shortens the stroke end from the nominal 100 mm maximum, giving commissioning engineers a quick way to dial in exact travel on packaging or assembly fixtures.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X100-50FA |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×100 | 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.
During machine commissioning, the 50 mm adjustable stroke lets technicians fine-tune the end position of a pusher or stop gate on the fly, eliminating the need to machine custom spacers or swap cylinders.
On packaging lines that handle multiple box sizes, the rear adjusting screw allows a quick stroke change to match different product widths, reducing downtime between batch runs.
In clamping or pressing fixtures, the adjustable stroke end can be periodically advanced to compensate for pad or tooling wear, maintaining consistent clamping force without replacing the actuator.
Choose the SCJ40 when you need to adjust the stroke end point on the machine, rather than swapping to a different fixed-stroke cylinder. If the 628 N push force at 0.5 MPa is marginal, stepping up to the 50 mm bore (SCJ50, 982 N push) provides a 56 % force increase without a large footprint change. For applications that do not require stroke adjustability, the standard SC fixed-stroke series is a simpler, lower-cost alternative.
This SCJ40X100-50FA is a direct replacement for an identical AirTAC model with the same bore, 100 mm nominal stroke, 50 mm adjust range, PT thread, and FA front flange mount. For strokes of 300 mm or more, evaluate side-load and rod bending; an external guide rail or a guided cylinder should be used to protect the rod bearing from excessive radial forces.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this cylinder generates 628 N of push force and 528 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 128 kgf.
You can replace a fixed-stroke SC40 with this SCJ40X100-50FA if you need the adjustable stroke feature and your mounting is compatible with the FA front flange. Ensure the port thread (PT), seal material (TPU), and the 100 mm nominal stroke match your application. The adjustable screw only shortens the stroke end, so the maximum travel remains 100 mm.
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