The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X140-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 140mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X140-40S is a 63 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that provides up to 40 mm of field-adjustable stroke reduction, letting you fine-tune the end position without swapping the cylinder. At 0.5 MPa it delivers 1559 N push and 1402 N pull, and the built-in magnet (suffix -S) allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for end-of-stroke detection.
This model uses a 20 mm rod with M16x1.5 threads and PT1/4 ports, and its adjustable air cushion decelerates the piston over the final 28 mm of travel. The SCJ body length A is 197 mm, slightly longer than a fixed-stroke SC of the same bore to house the adjustment mechanism. Operating pressure spans 0.15–1.0 MPa with a proof pressure of 1.5 MPa, and the speed range is 30–800 mm/s.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X140-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 140 mm |
| Stroke adjustment | Up to 40 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. |
| ×140 | Nominal (maximum) stroke length in mm. |
| -40 | 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 40 mm adjusting screw lets technicians fine-tune the stroke end position on a new machine without cutting brackets or re-machining stops, speeding up initial runoff and debugging.
In clamping or pressing fixtures where tooling wears over time, the adjustable stroke compensates for material loss, maintaining consistent contact force without shimming the cylinder mount.
On packaging or assembly lines that run multiple product sizes, operators can quickly dial in a new end-stop position for the 63 mm bore actuator, reducing changeover time between batches.
Choose the SCJ63X140-40S when you need to dial in a stroke end position during commissioning or changeover on a 63 mm bore platform. If the 1559 N push force at 0.5 MPa is marginal, stepping up to an 80 mm bore SCJ (2513 N push at 0.5 MPa) provides a substantial force increase; if you need a lighter, more compact actuator, the 50 mm bore SCJ offers 982 N push. For applications requiring a fixed, repeatable stroke with no field adjustment, the standard SC series is a simpler, lower-cost alternative.
This cylinder is a direct dimensional replacement for another AirTAC SCJ63 with a 140 mm nominal stroke, 40 mm adjust range, PT ports, and the -S magnet. At this 140 mm stroke, the rod is well supported within the bearing, but for strokes of 300 mm or more, consider an external guide rail or a guided cylinder to prevent side-load-induced rod bending and premature seal wear.
Adjustable-stroke checklist
The cylinder produces 1559 N push and 1402 N pull at 0.5 MPa, scaling linearly with pressure up to 2805 N push at 0.9 MPa. The rear adjusting screw only sets the stroke end position within a 40 mm range; it does not alter the bore area, operating pressure, or output force.
Yes, this is a direct replacement for any AirTAC SCJ63 adjustable-stroke cylinder with a 140 mm nominal stroke, a 40 mm adjustment range, PT ports, and a built-in magnet. Confirm that your mounting style (basic, FA, LB, or TC) and seal material match, as the SCJ does not use FB flange or CA/CB clevis mounts.
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