The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-50S 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X75-50S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides up to 50 mm of adjustment, letting you dial in the exact end position for commissioning or format changes without swapping the cylinder. With a 20 mm rod and 28 mm of air cushion at each end, it delivers controlled deceleration for a 1559 N push force at 0.5 MPa.
A built-in magnet is integrated into the piston, so CMSG, DMSG, or EMSG sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The body length A(SCJ) is 197 mm, and the PT1/4 ports keep plumbing simple. Operating pressure spans 0.15–1.0 MPa, with a proof pressure of 1.5 MPa, making this a robust choice for general industrial automation.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 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. |
| ×75 | 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 adjustment range lets technicians fine-tune the stroke end position during initial machine setup without fabricating hard stops, speeding up the commissioning process.
On packaging or assembly lines, quickly re-adjust the cylinder's end position to accommodate different product sizes or pallet dimensions, minimizing downtime between batches.
In high-cycle clamping or pressing fixtures, the adjustable screw can be used to take up mechanical wear on tooling over time, maintaining consistent clamp force without replacing the actuator.
Step up to the 80 mm bore SCJ if your application demands more than the 1559 N push force this 63 mm bore delivers at 0.5 MPa—the 80 mm bore provides 2513 N. For a simpler, fixed-stroke solution where field adjustment isn't required, the standard SC63 series offers the same force and mounting footprint. A direct replacement must match the 63 mm bore, 75 mm nominal stroke, 50 mm adjust range, PT port thread, and the built-in magnet; the basic mounting style uses no additional bracket. If your stroke is 300 mm or longer, evaluate side-loading on the 20 mm rod and consider adding an external guide or switching to a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The maximum push force at the 0.9 MPa operating limit is 2805 N. Because it is a single-rod cylinder, the push force is always greater than the pull force.
You can, provided the mounting and porting match. The SCJ63X75-50S has the same body envelope as an SC63 but includes a rear adjusting screw that shortens the stroke end by up to 50 mm. Ensure your machine has clearance for the longer rear cap and that you need the field-adjustable feature.
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