The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X120-30 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. Ø50mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X120-30 is a tie-rod, double-acting single-rod cylinder that puts a 30 mm adjustable stroke end right at the rear cap. At 0.5 MPa it delivers 982 N push and 825 N pull, giving you a mid-range force class that handles clamping, pressing, and light indexing without stepping up to a 63 bore.
A 20 mm piston rod and 21 mm air cushion are standard for the 50 mm bore. The rear screw lets you dial back the 120 mm nominal stroke in fine increments—ideal for commissioning trials or format changeovers where you need to tune the end position without swapping the cylinder or adding external hard stops.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X120-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 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, 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. |
| ×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.
Dial in the exact stroke end position during machine setup without re-plumbing or swapping cylinders. The 30 mm adjustment range lets you compensate for tooling tolerances on the fly.
Quickly adapt the cylinder stroke for different product sizes on packaging or assembly lines. One SCJ50X120-30 replaces multiple fixed-stroke cylinders, reducing changeover time.
As gripper pads, press tools, or bump stops wear down over time, use the rear adjusting screw to take up the slack and maintain consistent end positioning without replacing the cylinder.
Choose the SCJ50 when you need the 982 N push force at 0.5 MPa; if your load requires more, the SCJ63 offers 1559 N push. For applications that don't need field-adjustable stroke, the fixed-stroke SC50 is a simpler, slightly shorter alternative. This model is a direct replacement for any AirTAC SCJ50X120-30 with PT ports and basic mounting—match the bore, nominal stroke, and 30 mm adjust range exactly. For strokes of 300 mm or more, consider an external guide rail or a guided cylinder to protect the rod from side-load bending.
Adjustable-stroke checklist
At 0.5 MPa the cylinder produces 982 N pushing and 825 N pulling. At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 200 kgf. Push force is greater than pull force because the single rod reduces the piston area on the return stroke.
A rear-cap screw lets you shorten the stroke end by up to 30 mm without disassembling the cylinder. Pick the SCJ when you need to fine-tune the end position during commissioning, for format changes, or to compensate for wear. Choose the fixed-stroke SC50 if your stroke length is permanently fixed and you want a slightly more compact body.
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