The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-75S 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, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X120-75S is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ tie-rod series, engineered for applications where the stroke end position must be fine-tuned on the machine. Its rear-cap adjusting screw provides up to 75 mm of stroke-end reduction from the 120 mm nominal maximum, allowing commissioning engineers and maintenance teams to dial in the exact travel without swapping cylinders or adding external hard stops. The 63 mm bore delivers 1559 N of push force at 0.5 MPa, while the 20 mm diameter piston rod and 28 mm air cushion length contribute to reliable cycling in industrial automation tasks.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the barrel for non-contact position feedback. The standard TPU seal and PT port thread suit general-purpose pneumatic circuits operating between -20 and +70 °C. With a body length A(SCJ) of 197 mm, it fits into layouts where a compact, field-adjustable actuator is preferred over a fixed-stroke alternative.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 120 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. |
| ×120 | 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 technicians fine-tune the end position during machine commissioning without removing the cylinder, speeding up the setup of pick-and-place or clamping stations.
On packaging or assembly lines, operators can quickly re-set the stroke end to accommodate different product sizes, reducing downtime between batches.
In long-running tooling or press applications, the screw can be advanced to take up mechanical wear in the linkage, maintaining precise end-stop positioning over the cylinder's service life.
Choose the SCJ63 bore when your application needs the 1559 N push force class at 0.5 MPa. If the load requires a step up in force, the 80 mm bore provides 2513 N push at the same pressure; for a lighter, more compact solution, the 50 mm bore delivers 982 N. This adjustable-stroke model is ideal when the exact travel is unknown at design time or changes between product formats—if the stroke is permanently fixed, the standard SC series offers a simpler, cost-effective alternative. For strokes of 300 mm or more, evaluate side-loading on the 20 mm rod and consider an external guide or a guided cylinder to prevent rod bending.
As a direct replacement, match the 63 mm bore, 120 mm nominal stroke, 75 mm adjust range, PT port thread, and built-in magnet. The basic mounting configuration accepts the SCJ accessory subset—FA front flange, LB foot mount, or TC centre trunnion with TCM1 bracket—using the F-SC63 type code pattern. Note that FB flange and CA/CB clevis mounts are not available for the SCJ series.
Adjustable-stroke checklist
At 0.5 MPa, the 63 mm bore generates 1559 N of push force and 1402 N of pull force. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The pull force is lower because the rod occupies part of the piston area on the return stroke.
Yes, provided the mounting and porting match. The SCJ63X120-75S has the same bore, rod diameter (20 mm), and PT1/4 port as the SC63, but the body is slightly longer to house the adjusting screw. Ensure you have clearance for the rear adjustment mechanism and match the magnet option (-S) if your existing setup uses sensors.
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