The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-30S 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 is a double-acting, single-rod tie-rod cylinder with a rear adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. This lets you fine-tune the stopping position without swapping the cylinder, ideal for commissioning and format changes. Its 20 mm rod and 28 mm air cushion handle deceleration smoothly.
At 0.5 MPa, this 63 mm bore delivers 1559 N of push force and 1402 N on the pull stroke. The built-in magnet (suffix -S) allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection. The body length A(SCJ) is 197 mm, and the standard PT1/4 ports ensure straightforward pneumatic integration.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-30S |
|---|---|
| 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 commissioning, the 30 mm adjusting screw lets technicians quickly fine-tune the actuator's end position to match tooling or workpiece variations without removing the cylinder.
On packaging or assembly lines, operators can adjust the stroke to handle different product sizes or box heights, reducing changeover time compared to swapping fixed-stroke cylinders.
In clamping or pressing applications, the screw can be advanced to take up mechanical wear in linkages or tooling, maintaining consistent clamp force and position over the machine's life.
Choose the SCJ63X120-30 when you need to dial in a precise stroke end within a 30 mm window on a 120 mm nominal stroke. If your force requirement is lower, the 50 mm bore SCJ offers 982 N push at 0.5 MPa; for higher force, the 80 mm bore provides 2513 N. The fixed-stroke SC series is a better fit when the stroke length is permanently fixed and the adjusting screw is unnecessary.
For a direct replacement, match the 63 mm bore, 120 mm nominal stroke, 30 mm adjust range, PT1/4 ports, and the -S magnet option. This cylinder accepts the SCJ mounting subset: basic, FA front flange, LB foot, or TC centre trunnion with TCM1 bracket. Note that flange FB and clevis CA/CB mounts are not compatible with the SCJ series.
Adjustable-stroke checklist
At 0.5 MPa air pressure, the 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.
The rear adjusting screw mechanically limits the piston's extend stroke by up to 30 mm from its nominal 120 mm maximum. Pick the SCJ when you need to fine-tune the stroke end on the machine, such as during setup or for different product formats. If your stroke length is fixed and will never need field adjustment, the standard SC fixed-stroke cylinder is a simpler, more cost-effective choice.
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