The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X175-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø63mm bore, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X175-20S is a double-acting, single-rod pneumatic cylinder that puts fine stroke tuning directly in your hands. Its rear-cap adjusting screw provides up to 20 mm of field-adjustable stroke-end reduction, letting you dial in the exact 175 mm nominal stroke your application needs without swapping the cylinder or adding external hard stops. With a 20 mm rod, PT1/4 ports, and a 28 mm air cushion, it delivers 1559 N of push force at 0.5 MPa.
A built-in magnet (-S) is integrated into the piston, allowing CMSG/DMSG/EMSG reed and solid-state sensors to clamp directly onto the tie-rod barrel for reliable, non-contact position sensing. This makes the SCJ63X175-20S a smart choice for commissioning, format changeovers, and any process where the stroke end must be precisely matched to a moving machine member. The cylinder body length A(SCJ) is 197 mm, providing a compact footprint for its 63 mm bore class.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X175-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 20 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. |
| ×175 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Fine-tune the actuator's end-stop position during initial machine commissioning. The 20 mm adjustment screw allows engineers to compensate for mechanical stack-up tolerances and achieve perfect alignment without re-machining mounting brackets.
Quickly adapt a stopper or pusher cylinder to a new product size on a packaging line. The adjustable stroke eliminates the need to keep multiple fixed-stroke cylinders in inventory for different formats, reducing changeover time.
In high-cycle clamping or pressing fixtures, use the rear adjusting screw to take up mechanical wear on tooling or contact surfaces over time. This maintains consistent clamping force and position without replacing the cylinder or adding shims.
Choose the SCJ63 bore when your application needs the 1559 N push force at 0.5 MPa it provides. If you require a higher force, step up to the SCJ80 bore, which offers 2513 N of push at the same pressure. For applications needing less force in a smaller package, the SCJ50 bore delivers 982 N. The adjustable-stroke feature is ideal for processes that require periodic stroke-end tuning; if your stroke is permanently fixed, a standard SC63 fixed-stroke cylinder is a more economical choice. For replacement, match this model with another SCJ63X175-20S, ensuring the same bore, 175 mm nominal stroke, 20 mm adjustment range, PT port thread, and built-in magnet.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder provides a push force of 1559 N and a pull force of 1402 N. The push force is higher because the rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 0.9 MPa, the push force increases to 2805 N.
A rear-cap screw allows you to shorten the stroke end by up to 20 mm, providing a mechanical stop that is field-adjustable. Choose the SCJ when your application requires fine-tuning of the stroke end position after installation, such as for commissioning, format changes, or wear take-up. If your stroke length is permanently fixed and will never need adjustment, the standard SC fixed-stroke cylinder is a simpler, more cost-effective option.
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