The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-50 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 SCJ63X350-50 is a double-acting, single-rod pneumatic cylinder with a 50 mm rear adjusting screw, allowing the stroke end position to be fine-tuned on the machine without swapping the cylinder. With a 63 mm bore and a 20 mm diameter piston rod, it delivers 1559 N of push force at 0.5 MPa and up to 2805 N at the maximum operating pressure of 0.9 MPa, making it suitable for medium-duty positioning and clamping tasks that require flexibility during commissioning or format changes.
The cylinder body length (A dimension) is 197 mm, and it features a 28 mm air cushion for smooth deceleration. The PT1/4 port and M16x1.5 rod thread are standard. This model has a nominal stroke of 350 mm, which is well within the 1500 mm maximum standard stroke for the 63 mm bore, and uses the default TPU seal for a temperature range of -20 to +70 °C.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-50 |
|---|---|
| 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.
The 50 mm adjustable stroke lets technicians dial in the exact end-stop position during initial machine setup, compensating for minor variations in tooling or workpiece placement without needing to re-machine mounting brackets.
On a packaging line switching between different box sizes, the rear screw can quickly adjust the pusher stroke from 300 mm to 350 mm, eliminating the downtime required to install a different cylinder or add external hard stops.
In a clamping fixture, the stroke end can be extended by a few millimeters over time to compensate for wear on gripper pads or the workpiece itself, maintaining consistent clamping force without replacing the actuator.
Step up to an 80 mm bore if your application needs more force—the SCJ80 provides 2513 N of push at 0.5 MPa. For fixed, repeatable strokes where field adjustment is not needed, the standard SC63 fixed-stroke cylinder is a simpler, more cost-effective choice. If the 350 mm stroke creates a risk of side-loading or rod buckling, consider an external linear guide or a guided cylinder to protect the rod bearing.
A direct replacement must match the 63 mm bore, 350 mm nominal stroke, and the 50 mm adjustable range. The port thread is PT, the mounting is basic, and there is no magnet. For a drop-in swap, ensure the replacement unit has the same rear adjusting screw range and rod thread size.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. Because it is a single-rod cylinder, the push force is higher than the pull force due to the rod area. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 318 kgf.
Yes, if you need the stroke to be adjustable. The SCJ63X350-50 has the same 63 mm bore and mounting footprint as an SC63, but its overall body length is slightly longer to accommodate the rear adjusting mechanism. Ensure your machine has clearance for the adjusting screw and that the 50 mm adjustment range covers your stroke variation needs.
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