Airtac SCJ50 Standard Cylinder SCJ50X350-30
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X350-30 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, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke350 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X350-30
The SCJ50X350-30 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides 30 mm of field-adjustable stroke-end control. With a 50 mm bore and a nominal 350 mm stroke, it delivers 982 N of push force at 0.5 MPa, making it a versatile mid-range actuator for applications where the end position must be dialled in during commissioning or changeover without swapping the cylinder.
The 20 mm diameter piston rod and PT1/4 port ensure a robust connection, while the 21 mm air cushion decelerates the piston smoothly. The body length A(SCJ) is 194 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism. This model operates on 40 µm filtered air from 0.15 to 1.0 MPa, with a standard speed range of 30-800 mm/s.
Airtac SCJ50 Standard Cylinder SCJ50X350-30 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X350-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 350 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.
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 SCJ50X350-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×350 | 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.
Where the Airtac SCJ50 Standard Cylinder SCJ50X350-30 Is Used
Commissioning & Setup
The 30 mm rear adjustment screw lets technicians fine-tune the cylinder's stop position during initial machine setup, eliminating the need to shim or reposition the entire actuator for a perfect fit.
Product Format Changeover
On a packaging line, quickly adjust the stroke end to accommodate a new box size or product height. The 350 mm base stroke with 30 mm of adjustment covers a wide range of formats without mechanical modification.
Wear Compensation
In pressing or clamping fixtures, the adjustable stroke can be used to take up slack as tooling or workpieces wear over time, maintaining consistent contact pressure without reprogramming the machine controls.
Is the Airtac SCJ50 Standard Cylinder SCJ50X350-30 the Right Cylinder?
Select the SCJ50X350-30 when you need to precisely set a stroke end point within a 30 mm window on a 350 mm nominal stroke. If the force requirement increases, stepping up to a 63 mm bore provides 1559 N of push at 0.5 MPa. For a simpler, fixed-stroke solution without the rear adjuster, the standard SC50X350 is a direct alternative. A direct replacement must match the 50 mm bore, 350 mm nominal stroke, 30 mm adjustable range, PT port thread, and basic mounting.
At a 350 mm stroke, consider the potential for side-loading on the 20 mm rod. If the load is not guided externally, rod deflection could lead to premature seal wear or binding. For such cases, integrating an external linear guide or switching to a guided cylinder assembly is recommended to ensure long service life.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X350-30 FAQ
At the standard operating pressure of 0.5 MPa, the push force is 982 N and the pull force is 825 N. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 200 kgf.
A screw in the rear cap mechanically limits the piston's travel, allowing you to shorten the stroke end by up to 30 mm. This is a mechanical stop for stroke adjustment only. The cylinder will not hold its position if air pressure is lost; an external lock or pilot-operated check valve is required for load holding.
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