The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-40 is a double-acting, single-rod pneumatic cylinder that integrates a rear-cap adjusting screw to provide a 40 mm field-adjustable stroke range, letting you fine-tune the stroke end position from 85 mm up to the nominal 125 mm without replacing the unit. With a 63 mm bore and 20 mm piston rod, it delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa, making it a solid mid-range actuator for tasks that need on-machine stroke tweaking.
This genuine AirTAC adjustable-stroke cylinder features a 28 mm air cushion for smooth end-of-travel deceleration and a body length A of 197 mm. The PT1/4 ports and M16x1.5 rod thread ensure straightforward integration into standard pneumatic circuits. It operates reliably between -20 and +70 °C with a pressure range of 0.15 to 1.0 MPa, and the tie-rod construction allows for easy maintenance.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 40 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, 28 mm |
| Max stroke | Up to 1500 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -40 | 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 40 mm adjustable stroke allows engineers to precisely dial in the actuator's end position during initial machine setup, eliminating the need to stock multiple fixed-stroke cylinders for trial-and-error fitting.
On packaging or sorting lines, the stroke can be quickly adjusted to accommodate different product sizes or spacing requirements, reducing downtime between production runs without swapping the cylinder.
In clamping or pressing applications, the rear adjusting screw can be used to take up mechanical wear in tooling or gripper pads over time, maintaining consistent contact and force without reprogramming the machine.
Choose the SCJ63 bore when your application needs roughly 1560 N of push force at standard shop air. If you require more force, stepping up to the SCJ80 bore provides 2513 N of push at 0.5 MPa; for a lighter, more compact solution, the SCJ50 bore delivers 982 N. The 40 mm adjustment range on this model is ideal for commissioning trials or format changeovers where the exact stroke end needs to be dialed in on the machine.
For replacement, match this model with another SCJ63X125-40 cylinder with PT ports and basic mounting. If your application involves significant side loads, consider adding an external guide rail or switching to a guided cylinder, as the rod bearing is not designed to support heavy transverse forces. For a fixed-stroke solution without the adjustment feature, the standard SC63X125 is the direct alternative.
Adjustable-stroke checklist
At 0.5 MPa, this single-rod cylinder provides 1559 N of push force and 1402 N of pull force. At the maximum operating pressure of 0.9 MPa, the push force increases to 2805 N. The push force is greater than the pull force due to the area of the 20 mm piston rod.
A screw mechanism in the rear cap acts as an internal stroke limiter. By turning the screw, you can shorten the stroke end by up to 40 mm from the nominal 125 mm. This adjusts the physical stop position of the piston, not the air pressure or speed, giving you a precise and repeatable stroke length.
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