The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-30 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 SCJ63X120-30 brings a 63 mm bore double-acting cylinder with a field-adjustable stroke end, letting you dial back the nominal 120 mm stroke by up to 30 mm with the rear-cap screw. Its single 20 mm rod delivers 1559 N push and 1402 N pull at 0.5 MPa, rising to 2805 N push at the 0.9 MPa maximum operating pressure. The 28 mm air cushion at each end decelerates the piston smoothly, and the PT1/4 port supplies standard shop air.
Body length A measures 197 mm for the SCJ family, slightly longer than a fixed-stroke SC of the same bore to house the adjusting mechanism. The tie-rod construction keeps service straightforward, and the adjustable range is ideal for commissioning tweaks or format changes where the end position needs fine-tuning without swapping the cylinder. Operating range is -20 to +70 °C with the default TPU seals, and the proof pressure sits at 1.5 MPa.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-30 |
|---|---|
| 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.
During machine bring-up, the 30 mm screw adjustment lets technicians dial in the exact end-stop position without re-plumbing or swapping cylinders, saving hours of mechanical rework.
On packaging lines that run multiple box sizes, the adjustable stroke quickly resets the pusher end point. The 63 mm bore provides ample force for mid-weight carton handling.
In clamping or pressing fixtures, the rear screw can be advanced to take up pad wear or tooling compression, maintaining consistent clamp force without replacing the actuator.
Step up to the 80 mm bore SCJ if your load needs more than the 1559 N push this 63 mm unit provides at 0.5 MPa—the 80 mm bore delivers 2513 N at the same pressure. For a simpler fixed-stroke solution, the standard SC63X120 eliminates the adjusting screw and shortens overall length slightly. If your application involves significant side loading on this 120 mm stroke, consider an external guide rail or a guided cylinder to protect the rod bearing and piston seals. Replacement must match an AirTAC SCJ63 with a 120 mm nominal stroke, 30 mm adjust range, PT1/4 ports, and the same basic mounting configuration.
Adjustable-stroke checklist
At 0.5 MPa the cylinder pushes with 1559 N and pulls with 1402 N. At 0.7 MPa push rises to 2182 N, and at the 0.9 MPa maximum operating pressure it reaches 2805 N. The theoretical force at 1.0 MPa is 318 kgf, though the cylinder is rated only to 1.0 MPa operating pressure.
Yes, provided the original unit is an SCJ63 with a 120 mm nominal stroke and a 30 mm adjustment range. Confirm the port thread is PT1/4 and the mounting style matches—this basic-body version accepts FA, LB, or TC mounting kits. If the old cylinder has a magnet (S suffix) or different seal material, select the corresponding option code.
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