Airtac SCJ50 Standard Cylinder SCJ50X400-50
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-50 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke400 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X400-50
The SCJ50X400-50 is a double-acting, single-rod pneumatic cylinder that integrates a rear-cap adjusting screw, giving you 50 mm of on-machine stroke-end adjustment without removing the cylinder. With a 50 mm bore and a nominal 400 mm stroke, it delivers 982 N of push force at 0.5 MPa, making it a solid mid-range actuator for applications where the end position needs fine-tuning during commissioning or format changes.
This model uses a 20 mm diameter piston rod and PT1/4 ports. The adjustable air cushion decelerates the piston smoothly, and the body length A(SCJ) is 194 mm plus stroke. The stroke is well within the 1200 mm maximum standard stroke for the 50 mm bore, so this is a standard, readily available configuration.
Airtac SCJ50 Standard Cylinder SCJ50X400-50 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 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 SCJ50X400-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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 SCJ50X400-50 Is Used
Commissioning & Setup
The 50 mm adjustment range lets technicians dial in the exact stroke end position during initial machine setup without swapping out hard stops or cylinder bodies.
Product Changeover
Quickly adapt the stopping position for different product sizes on a packaging or sorting line by turning the rear screw, minimizing downtime between batches.
Wear Compensation
As tooling or gripper pads wear down over thousands of cycles, the stroke end can be incrementally extended to maintain consistent part contact and placement.
Is the Airtac SCJ50 Standard Cylinder SCJ50X400-50 the Right Cylinder?
Choose the SCJ50X400-50 when you need to dial in a precise end-of-travel position on the fly, a capability a fixed-stroke SC cylinder cannot offer. If you require more force, stepping up to the 63 mm bore provides 1559 N of push at 0.5 MPa. For applications needing less force in a smaller package, the 40 mm bore delivers 628 N. For strokes of 400 mm, be mindful of side-loading on the rod; if the load is not perfectly guided, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear. This SCJ directly replaces any AirTAC SCJ50X400-50 with PT ports and basic mounting.
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 SCJ50X400-50 FAQ
At the standard 0.5 MPa operating pressure, the cylinder produces 982 N of push force and 825 N of pull force. The push force is higher because the rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1964 N.
A rear-cap screw physically limits how far the piston can extend, giving you a variable stroke end within a 50 mm range. You would select this SCJ over a fixed-stroke SC cylinder when your application requires fine-tuning the end position in the field, such as for format changes or process optimization, without the need to stock multiple fixed-stroke cylinders.
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