Airtac SCJ50 Standard Cylinder SCJ50X400-20SH
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-20SH 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke400 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X400-20SH
The SCJ50X400-20SH is a 50 mm bore, double-acting single-rod cylinder with a rear adjusting screw that provides up to 20 mm of stroke-end adjustment, letting you fine-tune the 400 mm nominal stroke on the machine. It delivers 982 N of push force at 0.5 MPa and uses a 20 mm diameter piston rod with PT1/4 ports, making it a robust choice for mid-range force applications requiring precise end-position calibration.
This model is configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and Viton (FKM) seals (-H), extending the operating temperature range to 0–150°C. The tie-rod construction provides a durable, serviceable design, and the adjustable air cushion decelerates the piston smoothly at the stroke end, protecting the end cap during high-cycle operation.
Airtac SCJ50 Standard Cylinder SCJ50X400-20SH Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-20SH |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 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 SCJ50X400-20SH
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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 SCJ50X400-20SH Is Used
Commissioning & Setup
During machine commissioning, the 20 mm adjusting screw allows engineers to dial in the exact stroke end position without swapping cylinders or machining external stops, saving hours of setup time.
Hot Environment Format Changeover
In packaging lines with heated sealing stations, the Viton seals withstand 150°C while the adjustable stroke enables quick changeover between different product sizes by simply turning the rear screw.
Wear Compensation
For clamping or pressing fixtures, the stroke can be incrementally extended over time to compensate for tooling or pad wear, maintaining consistent clamping force without reprogramming the machine controller.
Is the Airtac SCJ50 Standard Cylinder SCJ50X400-20SH the Right Cylinder?
Step up to the 63 mm bore SCJ if you need more force—the SCJ63 delivers 1559 N push at 0.5 MPa. For applications where the stroke length is fixed and never needs field adjustment, the standard SC50 fixed-stroke cylinder offers a simpler, more compact alternative. When replacing this unit, match the 50 mm bore, 400 mm nominal stroke, 20 mm adjustment range, PT ports, and Viton seal; the magnet is required for sensor compatibility. At this 400 mm stroke, be mindful of side loading on the rod—if the load is not guided externally, consider adding a guide rod or switching to 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 (-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 SCJ50X400-20SH FAQ
The push force is 982 N at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the 20 mm rod area, providing 825 N at 0.5 MPa.
A screw in the rear cap sets the physical end-stop for the piston, shortening the stroke by up to 20 mm from the 400 mm nominal maximum. This is a mechanical stroke limiter, not a position lock; the piston will drift if air pressure is lost. For load holding without pressure, an external rod lock or pilot-operated check valve is required.
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