The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-10 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø63mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-10 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap adjusting screw provides up to 10 mm of stroke shortening, allowing fine-tuning of the piston's end position without removing the cylinder or adding external hard stops. With a 63 mm bore and a 20 mm diameter piston rod, it delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa.
This model features a 125 mm nominal stroke, PT1/4 pneumatic ports, and an M16x1.5 rod thread for mounting tooling. The adjustable air cushion decelerates the piston over the final 28 mm of travel, reducing end-of-stroke impact. The body length A(SCJ) is 197 mm, making it a compact solution for applications where the stroke endpoint needs periodic adjustment, such as wear take-up or format changeovers.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 10 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. |
| -10 | 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 10 mm rear adjuster allows operators to precisely dial in the stroke end position during machine commissioning or after maintenance, compensating for minor assembly tolerances without re-machining mounting brackets.
In material handling pushers or stoppers, the adjustable stroke can be gradually extended over the cylinder's service life to compensate for wear on contact pads or grippers, maintaining consistent part positioning.
On packaging or assembly lines running multiple product sizes, the screw adjuster enables quick stroke length changes between batches, reducing changeover time compared to swapping fixed-stroke cylinders.
Choose the SCJ63X125-10 when your application requires a push force around 1559 N at standard shop air and the ability to dial in the stroke end position. If you need more force, stepping up to the 80 mm bore provides 2513 N of push force at the same pressure. For a fixed, non-adjustable stroke, the standard SC63X125 is the direct alternative. This cylinder is a direct replacement for another AirTAC SCJ63X125-10 with a PT port and basic mounting, matching bore, nominal stroke, and 10 mm adjustment range. For strokes of 300 mm or more, evaluate side-loading on the 20 mm rod and consider an external guide or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, this 63 mm bore cylinder generates 1559 N of push force and 1402 N of pull force. The pull force is lower because the 20 mm piston rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 3118 N.
Yes, if your existing cylinder is an AirTAC SCJ63 with a 125 mm nominal stroke and a 10 mm adjustment range. Verify that the port thread is PT, the mounting is the basic tie-rod style, and there is no magnet option. The adjustable stroke range must match, as the rear screw mechanism defines the cylinder's end-position tuning capability.
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