Airtac SCJ50 Standard Cylinder SCJ50X250-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 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-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X250-20S
The SCJ50X250-20S is a 50 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap screw provides up to 20 mm of adjustment, letting you fine-tune the 250 mm nominal stroke during commissioning or changeovers without replacing the cylinder. With a 20 mm diameter piston rod and PT1/4 ports, it delivers 982 N of push force at 0.5 MPa.
This model includes a built-in magnet (-S suffix), allowing CMSG, DMSG, or EMSG sensors to clamp directly onto the tie-rod barrel for reliable, non-contact position sensing. The body length A(SCJ) is 194 mm, and the adjustable air cushion decelerates the piston smoothly at stroke end. It is a genuine AirTAC product, ready for integration into automated machinery.
Airtac SCJ50 Standard Cylinder SCJ50X250-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 20 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 SCJ50X250-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ50X250-20S Is Used
Commissioning Fine-Tuning
During machine setup, the 20 mm adjustment screw allows technicians to precisely dial in the cylinder's end stop position without mechanical modifications, saving hours of trial-and-error.
Product Format Changeover
In packaging lines, the adjustable stroke lets operators quickly reset the pusher stroke length when switching between different box or product sizes, minimizing downtime.
Sensor-Controlled Sequencing
The built-in magnet enables direct mounting of CMSG/DMSG sensors to confirm piston position at the adjusted stroke end, ensuring reliable sequencing with the machine's PLC.
Is the Airtac SCJ50 Standard Cylinder SCJ50X250-20S the Right Cylinder?
Choose the SCJ50X250-20S when you need a mid-range force cylinder with the flexibility to adjust the stroke end position on the machine. If your force requirement increases, stepping up to a 63 mm bore provides 1559 N of push force at the same 0.5 MPa pressure. For applications needing a fixed, non-adjustable stroke, the standard SC50X250 is a simpler, more economical alternative. When replacing this unit, match the 50 mm bore, 250 mm nominal stroke, 20 mm adjustment range, PT port thread, and the built-in magnet. For strokes of this length, consider an external guide rail or a guided cylinder if the rod is subjected to significant side loads to prevent bending.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ50X250-20S FAQ
A screw in the rear cap mechanically limits how far the piston can retract, shortening the stroke end by up to 20 mm from the 250 mm nominal maximum. You turn the screw to set the exact end position needed. It does not change the cylinder's output force, which remains 982 N push and 825 N pull at 0.5 MPa.
Yes, if you need the ability to fine-tune the stroke. The SCJ50X250-20S shares the same 50 mm bore, PT1/4 ports, and mounting accessories as a standard SC50. Ensure the 20 mm adjustment range is sufficient for your application, and match the sensor option if you are using the magnet.
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