The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X225-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø63mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X225-75S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly in your hands. Its rear-cap adjusting screw provides a 75 mm adjustment range, allowing you to dial in the exact 225 mm (or shorter) stroke you need on the machine without swapping the cylinder. With a 20 mm diameter piston rod and a 1559 N push force at 0.5 MPa, it handles substantial mid-range automation tasks.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The 28 mm air cushion at each end decelerates the piston smoothly, and the PT1/4 ports are standard. The body length A is 197 mm, making it a compact, field-configurable solution for dynamic stroke requirements.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X225-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 75 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. |
| ×225 | Nominal (maximum) stroke length in mm. |
| -75 | 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 75 mm adjustment range lets commissioning engineers fine-tune the actuator's end position during trial runs, perfect for dialing in precise stopping points on prototype assembly stations without needing a collection of fixed-stroke cylinders.
Quickly adapt the stroke for different box or carton sizes on a packaging machine. The rear screw allows operators to shorten the 225 mm nominal stroke in seconds, minimizing downtime between product runs.
In a pneumatic clamping or pressing fixture, the adjustable stroke compensates for tooling wear or material thickness variations over time, maintaining consistent clamp force without reprogramming or adding shims.
Step up to the 80 mm bore SCJ80 series for a significant force increase to 2513 N push at 0.5 MPa, or down to the 50 mm bore SCJ50 for 982 N if this unit is over-specified. If your application does not require field adjustability, a fixed-stroke SC63X225 cylinder provides the same force in a slightly shorter body. For guided loads, pair this with an external guide or consider a guided cylinder. As a direct replacement, match the 63 mm bore, 225 mm nominal stroke, 75 mm adjust range, PT port thread, and the built-in magnet; this model uses a basic mount, so confirm your existing bracket matches the F-SC63 series accessory pattern.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, 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 due to the rod area on the return side.
Yes, provided the bore, port thread, and mounting match. The SCJ63X225-75S has a nominal maximum stroke of 225 mm, which you can adjust down by up to 75 mm. It is a direct dimensional replacement for an SC63 with a basic mount, but the body length A is 197 mm, which is slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism.
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