The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X25-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø63mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X25-30S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the 25 mm nominal stroke down by up to 30 mm without swapping the unit. With a 20 mm rod and 28 mm air cushion, it delivers 1559 N of push force at 0.5 MPa, making it a solid mid-bore workhorse for short-throw positioning.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for non-contact end-of-stroke sensing. The body length A(SCJ) is 197 mm, and the rear adjusting screw sets the stroke end precisely—ideal for commissioning trials or wear take-up on jigs and fixtures.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X25-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 30 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. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -30 | 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 end position of a 25 mm stroke actuator during machine build without needing shims or external hard stops. The 30 mm adjustment range lets technicians dial in the exact stop point on a pick-and-place nest.
On a packaging line, a pusher arm may gradually wear its end-stop bumper. The SCJ63X25-30S lets operators advance the stroke end by up to 30 mm to compensate, maintaining consistent product placement without replacing the cylinder.
In a small assembly cell, changing from one product variant to another may require a slightly shorter push stroke. The rear adjusting screw allows a quick, tool-free stroke-end change within the 30 mm range, reducing changeover downtime.
Choose the SCJ63X25-30S when you need a 63 mm bore’s force class (1559 N push at 0.5 MPa) but must dial in the stroke end on the machine. If you need more force, step up to the 80 mm bore (2513 N push); if space is tight, the 50 mm bore (982 N push) may fit. For a fixed, non-adjustable stroke, the standard SC63 cylinder is a simpler alternative.
As a direct replacement, match the bore (63 mm), nominal stroke (25 mm), adjust range (30 mm), PT port thread, basic mounting, and the -S magnet option. If the application involves side loads or the stroke is extended later, consider an external guide or a guided cylinder to protect the rod bearing from bending moments.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (the difference is due to the 20 mm single rod). At the maximum operating pressure of 0.9 MPa, the push force reaches 2805 N. These forces are identical to the fixed-stroke SC63 cylinder of the same bore.
Yes, provided the mounting and porting match. The SCJ63X25-30S has the same body length A(SCJ) of 197 mm and the same force output as an SC63. The key difference is the rear adjusting screw, which lets you shorten the 25 mm nominal stroke by up to 30 mm. Ensure your machine frame has clearance for the slightly longer rear cap.
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