The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X300-75S 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X300-75S 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 removing the unit from the machine. With a 63 mm bore and a 20 mm piston rod, it delivers 1559 N of push force at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa, making it a robust actuator for mid-range industrial tasks where stroke length needs to be dialed in precisely during commissioning or format changes.
This model includes a built-in magnet (suffix -S), allowing CMSG/DMSG/EMSG reed or solid-state sensors to be clamped directly onto the tie-rod barrel for reliable end-of-stroke detection. The adjustable cushion, with a 28 mm cushion length, decelerates the piston smoothly, while the rear adjusting screw sets the stroke end within the 75 mm range. The body length A(SCJ) is 197 mm, and the standard PT1/4 port and M16x1.5 rod thread ensure straightforward integration into existing pneumatic circuits.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X300-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 300 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. |
| ×300 | 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 rear adjustment screw allows technicians to fine-tune the end-stop position during initial machine setup without swapping cylinders or adding external hard stops, speeding up line commissioning.
Used as a pneumatic stop on a conveyor for different product sizes, the stroke can be quickly changed from 225 mm to 300 mm by adjusting the rear screw, accommodating a new box format in minutes.
In a clamping fixture, the adjustable stroke compensates for tooling or pad wear over time. The operator simply turns the rear screw to restore the correct clamping position without disassembling the tool.
Choose the SCJ63 when your application needs a push force around 1559 N at standard shop air (0.5 MPa). If you require more force, step up to the 80 mm bore which provides 2513 N push at the same pressure; if you need a more compact actuator and can accept 982 N, the 50 mm bore is a lighter alternative. The 75 mm adjustable range on this model is ideal for processes that need a broad stroke-end tuning window. For a fixed, non-adjustable stroke, the standard SC63 cylinder is a simpler choice, while a guided cylinder or external linear guide should be considered for this 300 mm stroke to manage side loads and prevent rod bending.
When replacing an existing unit, match the 63 mm bore, 300 mm nominal stroke, 75 mm adjust range, PT port thread, and the -S magnet option. This basic-mount cylinder uses the tie-rod body for direct mounting; if you need a pivoting motion, select the SCJ63 with a TC centre trunnion and TCM1 bracket instead.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 1559 N, and the pull force on the return stroke is 1402 N because the 20 mm piston rod reduces the effective piston area. At the maximum operating pressure of 0.9 MPa, the push force reaches 2805 N.
A rear-cap adjusting screw limits the piston's forward travel, letting you shorten the stroke end by up to 75 mm from the 300 mm nominal maximum. It is a direct dimensional replacement for an SC63 of the same bore and nominal stroke, provided you have clearance for the slightly longer SCJ body (A=197 mm) and the adjusting screw mechanism.
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