The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X80-75S 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X80-75S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston stop position by up to 75 mm without swapping the unit. With a 63 mm bore, it delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa, driven by a 20 mm diameter piston rod. The rear-cap adjusting screw shortens the nominal 80 mm stroke, making it ideal for commissioning trials or format changes where the exact stop point must be dialled in on the machine.
This model includes a built-in magnet (denoted by the -S suffix), so CMSG, DMSG, or EMSG solid-state and reed sensors can be clamped directly onto the tie-rod barrel for reliable end-of-stroke detection. The standard TPU seal operates from -20 to +70 °C, and the PT1/4 port threads match common pneumatic fittings. The body length A for this SCJ series is 197 mm, slightly longer than a fixed-stroke SC of the same bore to house the adjusting mechanism.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X80-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 80 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. |
| ×80 | 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.
During machine bring-up, the 75 mm adjustment range allows engineers to experimentally determine the optimal stroke end for a pusher or stop without ordering multiple fixed-stroke cylinders.
On a packaging line, the stroke can be quickly re-set to accommodate different box widths or product positions, minimizing downtime between batches.
In clamping or pressing operations, the adjusting screw can be advanced over time to take up mechanical wear in tooling or fixtures, maintaining consistent contact force.
Choose the SCJ63X80-75S when you need to set a precise, repeatable stroke end within a 75 mm window during setup or product changeover. If your application requires more push force, stepping up to the 80 mm bore (2513 N at 0.5 MPa) provides a significant power increase; for a lighter, more compact solution, the 50 mm bore (982 N at 0.5 MPa) may suffice. This adjustable-stroke cylinder is the right pick over a fixed-stroke SC when the exact stroke length is not fully defined at the design stage or must be tweaked regularly. For a direct replacement, match an SCJ cylinder with a 63 mm bore, 80 mm nominal stroke, a -75 adjust range, PT ports, and a built-in magnet. If the load applies a significant side force, consider an external guide rail or a guided cylinder to protect the rod and bearings from premature wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder produces 1559 N of push force and 1402 N of pull force. The push force is higher because the single piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 3118 N.
It can if you need the added benefit of a field-adjustable stroke end. You must match the 63 mm bore, PT1/4 ports, and a mounting style from the SCJ subset (basic, FA, LB, or TC). The SCJ body is slightly longer than a comparable SC cylinder to accommodate the rear adjusting screw, so verify the available machine space.
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