The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-30STC 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, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X120-30STC is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, allowing operators to fine-tune the piston's stop position within a 30 mm range without replacing the unit. This 63 mm bore model delivers a substantial 1559 N of push force at 0.5 MPa, making it a robust choice for medium-duty automation tasks where precise end-point calibration is critical during commissioning or format changes.
Equipped with a built-in magnet for easy sensor mounting and a centre trunnion (TC) bracket for pivoting applications, this cylinder is ready for complex motion requirements. The 20 mm rod and PT1/4 ports ensure reliable power transmission, while the adjustable air cushion decelerates the 120 mm stroke smoothly, protecting end caps from impact.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-30STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 120 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. |
| ×120 | 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.
Quickly adjust the end-stop for different product sizes on packaging or labeling machines by turning the rear screw, eliminating the need for mechanical stops and reducing downtime between batches.
Fine-tune the final clamp position to accommodate varying workpiece thicknesses in assembly jigs, ensuring consistent pressure without over-travel that could damage delicate components.
Dial in the exact stroke during initial machine setup or compensate for mechanical wear over time. The 30 mm adjustment range provides ample room for precise calibration without reprogramming the controller.
Choose the SCJ63 when you need the 1559 N push force at 0.5 MPa; if your load requires more, step up to the 80 mm bore which provides 2513 N. For applications where the stroke length is permanently fixed, a standard SC63 cylinder removes the adjustment mechanism for a simpler, more compact solution. This SCJ63X120-30STC is a direct replacement for any AirTAC SCJ cylinder with a 63 mm bore, 120 mm nominal stroke, 30 mm adjust range, PT ports, magnet, and TC trunnion mount (F-SC63TC).
Adjustable-stroke checklist
At 0.5 MPa, this cylinder provides 1559 N of push force and 1402 N of pull force. The push force is higher because the single rod reduces the piston area on the pull side. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 318 kgf.
It is a direct dimensional and functional replacement for any AirTAC SCJ63 cylinder with a 120 mm nominal stroke and a 30 mm adjustment range, provided the old unit also used PT ports, a built-in magnet, and a TC centre trunnion mount. Always verify the mounting bracket code (F-SC63TC) matches your setup.
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