The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-50 is a double-acting, single-rod pneumatic cylinder that provides a nominal 125 mm stroke, field-adjustable down by up to 50 mm via a rear-cap screw. This 63 mm bore unit delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa, making it a solid mid-range actuator for tasks that need stroke fine-tuning without swapping the cylinder.
Its 20 mm diameter piston rod and 28 mm air cushion at each end help manage end-of-stroke impacts. The body length A(SCJ) is 197 mm, and the adjustable screw sets the stroke end position precisely, which is ideal for commissioning trials or format changeovers where the stopping point must be dialled in on the machine.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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 50 mm adjustment range lets technicians dial in the exact stroke end position during machine commissioning without cutting or swapping hard stops, speeding up line start-up.
On packaging or sorting lines, the stroke can be quickly re-adjusted for different box sizes or product formats, reducing downtime between batches.
As tooling or gripper pads wear over time, the rear adjusting screw can be turned to take up the slack and restore the precise end position, extending maintenance intervals.
Choose the SCJ63 when you need field-adjustable stroke end control in the 63 mm bore class. If the 1559 N push force at 0.5 MPa is insufficient, stepping up to an 80 mm bore provides 2513 N; if it is more than you need, a 50 mm bore delivers 982 N. This adjustable-stroke model is the right pick when the application requires fine-tuning the end position, whereas a fixed-stroke SC63 is a simpler, more compact choice when the stroke is permanently fixed. For a direct replacement, match the 63 mm bore, 125 mm nominal stroke, 50 mm adjustment range, PT1/4 port thread, and basic mounting. At 125 mm stroke, rod bending is not typically a concern, but always align the load axially to avoid side-loading the rod and seals.
Adjustable-stroke checklist
At 0.5 MPa, it generates 1559 N pushing and 1402 N pulling. At the maximum operating pressure of 0.9 MPa, the push force reaches 2805 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
Only if you need the stroke-end adjustment feature. The SCJ63X125-50 has a longer body (A=197 mm) than a fixed-stroke SC63 to house the adjusting screw. It is a direct replacement for another AirTAC SCJ63 with the same 125 mm nominal stroke, 50 mm adjustment range, and PT port thread.
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