Airtac SCJ50 Standard Cylinder SCJ50X210-75
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X210-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø50mm bore, 210mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke210 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X210-75
The SCJ50X210-75 is a double-acting, single-rod tie-rod cylinder with a rear-cap adjusting screw that provides a 75 mm field-adjustable stroke-end range. Operating on filtered air at 0.15–1.0 MPa, this 50 mm bore unit delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a capable mid-range actuator for tasks that need on-machine stroke tweaking without cylinder swaps.
The 20 mm diameter piston rod and PT1/4 ports are standard for this bore class, while the 21 mm air cushion at each end decelerates the piston quietly. The body length A(SCJ) is 194 mm, slightly longer than the fixed-stroke SC equivalent to accommodate the adjusting mechanism. With a nominal 210 mm stroke, this model sits well within the 1200 mm maximum standard stroke for bore 50, so it is available as a standard catalog item.
Airtac SCJ50 Standard Cylinder SCJ50X210-75 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X210-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 210 mm |
| Stroke adjustment | Up to 75 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 SCJ50X210-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×210 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ50X210-75 Is Used
Commissioning & Setup
During machine bring-up, the 75 mm adjustment screw lets technicians dial in the exact stroke end position without cutting brackets or repositioning sensors, speeding up the debug process.
Product Changeover
On a packaging line running multiple box sizes, the SCJ50X210-75 can be quickly reset to a new push-off or stop position, reducing changeover time between batches.
Wear Compensation
In a clamping or pressing fixture, the adjustable stroke end can be advanced slightly over time to compensate for pad or tooling wear, maintaining consistent clamping force without replacing parts.
Is the Airtac SCJ50 Standard Cylinder SCJ50X210-75 the Right Cylinder?
Choose the SCJ50X210-75 when your application requires a nominal 210 mm stroke but you anticipate needing to fine-tune the end position by up to 75 mm during commissioning or format changes. If you need more push force, stepping up to the 63 mm bore provides 1559 N at 0.5 MPa; if space is tight, the 40 mm bore offers 628 N. For applications where the stroke is absolutely fixed and you never need field adjustment, the standard SC50X210 is a simpler, slightly more compact alternative. As a direct replacement, match an AirTAC SCJ cylinder of 50 mm bore, 210 mm nominal stroke, 75 mm adjust range, PT port thread, and basic mounting. For this 210 mm stroke, ensure the rod is not subjected to high side loads; if lateral forces are present, add an external linear guide or consider a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ 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 SCJ50X210-75 FAQ
At 0.5 MPa, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1963 N. The pull force is always lower because the 20 mm rod reduces the effective piston area on the return stroke.
No, the SCJ50X210-75 is a standard double-acting cylinder and will not hold its position if air pressure is lost or the valve is centered. The rear adjusting screw only sets the stroke end stop; it does not lock the piston rod. If your load must be held without live air pressure, you need an external rod lock, a mechanical brake, or a pilot-operated check valve.
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