The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø50mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X125-100 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you up to 100 mm of fine-tuning range from the rear cap. At 0.5 MPa, it delivers 982 N of push force and 825 N on the pull stroke, making it a capable mid-bore actuator for tasks that need frequent end-position changes.
The 20 mm diameter piston rod and PT1/4 ports handle standard shop air, while the built-in 21 mm air cushion decelerates the piston quietly at each end. With a body length A of 194 mm at zero stroke, this tie-rod design is compact enough for tight machine frames yet robust for production environments.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 100 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, 21 mm |
| Max stroke | Up to 1200 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -100 | 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.
Dial in the exact stop position during machine runoff without swapping cylinders or machining hard stops. The 100 mm adjustment range covers most trial-and-error setup needs.
Quickly reset the stroke end for different product sizes on packaging or sorting lines. Operators adjust the rear screw in seconds, minimizing downtime between batches.
Take up mechanical play or tooling wear over time by slightly extending the effective stroke. This keeps processes like pressing or clamping within tolerance without a full cylinder swap.
Step up to a 63 mm bore (1559 N push at 0.5 MPa) if your load exceeds the 50 mm bore's capacity, or drop to 40 mm (628 N) for lighter, faster-cycling stations. If your stroke length never changes after commissioning, a fixed-stroke SC50X125 cylinder simplifies the bill of materials. For guided loads, pair this with an external guide rail to protect the rod from side forces. A direct replacement must match the 50 mm bore, 125 mm nominal stroke, 100 mm adjust range, PT ports, and basic mounting style.
Adjustable-stroke checklist
At 0.5 MPa, push force is 982 N and pull force is 825 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The pull force is lower because the single rod reduces the piston area on the return side.
Yes, if the mounting pattern, port size (PT1/4), and overall envelope fit. The SCJ body is slightly longer to house the adjusting screw. You gain 100 mm of stroke-end adjustability, but you must ensure the extra length and the screw access clearance are available in your machine.
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