The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-50S 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. Ø63mm bore, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ63X350-50S is a double-acting, single-rod pneumatic cylinder that provides a 50 mm field-adjustable stroke range via a rear-cap adjusting screw. This lets you fine-tune the end position of its 350 mm nominal stroke without replacing the cylinder, ideal for commissioning and format changes. The built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
With a 20 mm piston rod and a 28 mm air cushion, this 63 mm bore cylinder delivers a substantial 1559 N of push force at 0.5 MPa. The tie-rod construction and PT1/4 ports make it a robust, serviceable workhorse. Its body length A(SCJ) is 197 mm, providing a compact yet powerful solution for applications requiring a tunable stop position within a 50 mm window.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 350 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, 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. |
| ×350 | 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 adjustment screw allows engineers to precisely dial in the actuator's end-stop for a perfect fit, eliminating the need to stock multiple fixed-stroke cylinders for trial and error.
On packaging lines, the stroke can be quickly re-adjusted to accommodate different box or product sizes. The SCJ63X350-50S provides the 1559 N force needed for case erectors or palletizers, with the flexibility to change formats in minutes.
In high-cycle clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamping force without reprogramming the machine's controller.
Select the SCJ63X350-50S when your application demands a strong push force—1559 N at 0.5 MPa—and the ability to dial in the stroke end point on the machine. If you need more force, stepping up to the 80 mm bore provides 2513 N of push force at the same pressure. For applications where the stroke is fixed and never needs adjustment, the standard SC63X350 fixed-stroke cylinder is a more economical choice.
For this 350 mm stroke, be mindful of side-loading which can cause rod bending. If your load is not perfectly guided, consider using an external guide rail or switching to a guided cylinder assembly. This model is a direct replacement for another AirTAC SCJ63X350-50S cylinder with PT ports, basic mounting, and a magnet.
Adjustable-stroke checklist
The push force is 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa. The pull force is slightly less due to the 20 mm rod diameter, providing 1402 N at 0.5 MPa. This is a single-rod cylinder, so push and pull forces are not equal.
Yes, the SCJ63X350-50S is a direct dimensional and functional replacement for any AirTAC SCJ63 cylinder with a 350 mm nominal stroke, a 50 mm adjustment range, PT ports, basic mounting, and a magnet. Ensure the port type and mounting style match your current setup.
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