Airtac SCJ50 Standard Cylinder SCJ50X250-50
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-50 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. Ø50mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke250 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X250-50
The SCJ50X250-50 is a double-acting single-rod pneumatic cylinder with a rear-cap adjusting screw that lets you shorten the stroke end by up to 50 mm in the field. At 0.5 MPa it delivers 982 N push and 825 N pull, driven by a 20 mm diameter piston rod, making it a solid mid-range actuator for tasks that need a repeatable but tweakable end position.
With a 250 mm nominal stroke and a 21 mm air cushion at each end, this tie-rod cylinder decelerates the piston smoothly without external shock absorbers. The body length A(SCJ) is 194 mm plus stroke, and the rear screw adds only a small amount to the overall envelope compared to a fixed-stroke SC of the same bore—no need to leave extra space for an external hard stop.
Airtac SCJ50 Standard Cylinder SCJ50X250-50 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 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, 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.
Theoretical Output Force (Ø50mm)
| 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.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X250-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×250 | 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.
Where the Airtac SCJ50 Standard Cylinder SCJ50X250-50 Is Used
Commissioning & Setup
Dial in the exact stroke end during machine commissioning without cutting brackets or swapping cylinders—just turn the rear screw through the full 50 mm range.
Format Changeover
On packaging lines that run multiple box sizes, adjust the pusher stroke end in minutes rather than replacing the actuator for each format.
Wear Compensation
Take up mechanical wear in gripper or clamp mechanisms by fine-tuning the stroke end, keeping cycle time and contact force consistent over months of operation.
Is the Airtac SCJ50 Standard Cylinder SCJ50X250-50 the Right Cylinder?
Step up to the SCJ63X250-50 if you need more force (1559 N push at 0.5 MPa) without a big jump in port size, or drop to the SCJ40X250-50 (628 N push) when the 50 mm bore is over-spec for a light payload. If the stroke never needs field adjustment, the fixed-stroke SC50X250 costs less and shares the same mounting accessories. For a direct replacement, match an SCJ50X250-50 with PT ports, basic mount, and no magnet—the adjustable range must be 50 mm to keep the same machine setup. At 250 mm stroke, rod buckling is not a primary concern, but if the load applies any side force, add an external guide rail or switch to a guided cylinder.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X250-50 FAQ
At 0.5 MPa the push force is 982 N and the pull force is 825 N (the difference comes from the 20 mm rod area on the return side). At the maximum operating pressure of 1.0 MPa, push reaches 1963 N and pull 1650 N.
Yes, provided the extra length of the rear adjusting screw housing fits your machine envelope. The SCJ uses the same PT1/4 ports, 20 mm rod thread (M16x1.5), and SC-series mounting brackets (FA, LB, TC). Set the screw to zero adjustment and it behaves like an SC50X250.
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