The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-30S 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-30S is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw, allowing you to fine-tune the stroke end position by up to 30 mm without replacing the unit. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force at 0.5 MPa and up to 2805 N at 0.9 MPa, making it a robust choice for applications requiring on-machine stroke calibration.
This model features a built-in magnet, so you can directly mount CMSG/DMSG/EMSG reed or solid-state sensors on the barrel for reliable end-of-stroke detection. The cylinder uses a PT1/4 port, has a 28 mm air cushion for smooth deceleration, and operates on 40 µm filtered air at pressures from 0.15 to 1.0 MPa.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 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. |
| ×125 | 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 setup, the 30 mm adjustment screw lets technicians precisely set the end-stop for a clamping mechanism without needing to machine custom spacers or swap cylinders.
On a packaging line switching between box sizes, the adjustable stroke allows operators to quickly reset the pusher stroke end for different carton depths, minimizing downtime.
In a pressing or stamping operation, the stroke can be incrementally extended over time to compensate for tooling wear, maintaining consistent contact force without replacing the actuator.
Choose the SCJ63 for its 1559 N push force at 0.5 MPa, a significant step up from the SCJ50 which delivers 982 N. If your load requires even greater force, the SCJ80 bore provides 2513 N. This adjustable-stroke version is ideal when you need to dial in a precise stop position during commissioning or format changes, whereas a fixed-stroke SC63 is a simpler, more cost-effective choice if the stroke is permanently fixed. For strokes of 300 mm or longer, consider an external guide rail or a guided cylinder to protect the 20 mm rod from side-load bending.
As a direct replacement, match this to another SCJ63 with a 125 mm nominal stroke and a 30 mm adjustment range, ensuring the PT port thread and the -S magnet option are identical. This model uses the basic mounting style, but FA front flange or LB foot mounts are available if needed.
Adjustable-stroke checklist
The push force is 1559 N at 0.5 MPa and 2805 N at 0.9 MPa. The pull force is lower due to the single 20 mm rod, providing 1402 N at 0.5 MPa. The adjusting screw sets the stroke end position but does not alter these force values.
Yes, if you need the ability to fine-tune the stroke end by up to 30 mm. The SCJ63X125-30S has the same bore, rod, and port size as an SC63, but the body is slightly longer to house the adjustment mechanism. Ensure your mounting space accommodates the extra length.
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