Airtac SCJ50 Standard Cylinder SCJ50X225-50S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X225-50S 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, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke225 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X225-50S
The AirTAC SCJ50X225-50S is a double-acting, single-rod tie-rod cylinder with a rear-cap adjusting screw that lets you fine-tune the stroke end by up to 50 mm without swapping the unit. Its 50 mm bore delivers 982 N of push force at 0.5 MPa and 1767 N at 0.9 MPa, making it a solid mid-range actuator for tasks that need on-machine stroke trimming.
A built-in magnet (-S) allows CMSG/DMSG/EMSG reed or solid-state sensors to clamp directly onto the barrel for reliable end-of-stroke detection. The 20 mm piston rod, PT1/4 ports, and 21 mm air cushion work together to provide smooth deceleration, while the 194 mm body length (A dimension) keeps the footprint compact for its 225 mm nominal stroke.
Airtac SCJ50 Standard Cylinder SCJ50X225-50S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X225-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 225 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 SCJ50X225-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×225 | 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 SCJ50X225-50S Is Used
Commissioning Stroke Fine-Tuning
The 50 mm rear screw adjustment lets technicians dial in the exact stroke end during machine setup without removing the cylinder, speeding up commissioning of packaging or assembly stations.
Format Changeover on Conveyors
When a conveyor diverter or stop gate needs a different throw for a new product size, the SCJ50X225-50S adjusts in place, eliminating the need to stock multiple fixed-stroke cylinders for each format.
Wear Compensation in Clamping
In clamping or pressing fixtures where tooling or pads wear over time, the adjustable stroke end can be periodically extended to maintain consistent clamp force and part contact without shimming.
Is the Airtac SCJ50 Standard Cylinder SCJ50X225-50S the Right Cylinder?
Choose the SCJ50X225-50S when you need to dial in the stroke end during commissioning or changeover without fitting external hard stops. If your force requirement grows, stepping up to the 63 mm bore provides 1559 N push at 0.5 MPa; if you can accept a fixed stroke, the standard SC50 series offers a simpler, lower-cost alternative. For a direct replacement, match the 50 mm bore, 225 mm nominal stroke, 50 mm adjust range, PT port thread, basic mounting, and the -S magnet option.
At 225 mm of stroke, the rod is still well-supported, but if your application introduces side loads, consider adding an external linear guide or switching to a guided cylinder to protect the rod bearing and piston seals from premature wear.
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 SCJ50X225-50S FAQ
At 0.5 MPa (approximately 5 bar), this cylinder produces 982 N of push force (extending) and 825 N of pull force (retracting). The pull force is lower because the 20 mm piston rod reduces the effective piston area on the return stroke.
Yes, provided the nominal stroke, port thread, and mounting match. The SCJ body is slightly longer to accommodate the adjusting screw mechanism, so verify the available space. You must also match the -S magnet option if your existing setup uses barrel-mounted sensors.
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