Airtac SCJ50 Standard Cylinder SCJ50X400-30
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-30 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke400 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X400-30
The SCJ50X400-30 is a double-acting, single-rod pneumatic cylinder from AirTAC's adjustable-stroke SCJ series, offering a 50 mm bore and a nominal 400 mm stroke. The defining feature is the rear-cap adjusting screw, which provides up to 30 mm of fine-tuning on the stroke end position, making it ideal for commissioning, format changeovers, or taking up wear without swapping the cylinder. It delivers a push force of 982 N at 0.5 MPa and up to 1767 N at the maximum operating pressure of 0.9 MPa.
This model uses a 20 mm diameter piston rod with an M16x1.5 thread and PT1/4 ports. The cylinder body has an 'A' dimension of 194 mm plus the stroke, making it slightly longer than a fixed-stroke SC of the same bore. It includes an adjustable air cushion for smooth deceleration and is rated for speeds from 30 to 800 mm/s. This is a basic configuration with TPU seals, PT threads, and no magnet, suitable for standard industrial air service from -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X400-30 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 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 SCJ50X400-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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 SCJ50X400-30 Is Used
Commissioning & Setup
The 30 mm adjustable stroke allows technicians to fine-tune the end position during initial machine setup, eliminating the need to shim or re-drill mounting brackets to achieve perfect part placement.
Wear Compensation
On a high-cycle conveyor stop or diverter, the adjusting screw can be turned to take up mechanical wear on a contact pad or tooling, maintaining precise positioning over the cylinder's service life without replacing parts.
Format Changeover
In packaging or assembly lines running multiple product sizes, a quick adjustment of the rear screw changes the actuator's stroke end to match a new box height or component position, reducing changeover time significantly.
Is the Airtac SCJ50 Standard Cylinder SCJ50X400-30 the Right Cylinder?
Choose the SCJ50X400-30 when you need a robust 50 mm bore cylinder with the ability to dial in the stroke end precisely on the machine. If 982 N of push force at 0.5 MPa is insufficient, stepping up to a 63 mm bore (SCJ63) provides 1559 N of push force. For applications that do not require stroke adjustment, the fixed-stroke SC50 series is a simpler and more cost-effective alternative. This cylinder is a direct replacement for another AirTAC SCJ50 with a 400 mm stroke and 30 mm adjust range, matching PT ports and basic mounting.
With a 400 mm stroke, rod deflection under side loading is a critical design consideration. Ensure the load is guided externally and the cylinder is used in pure axial push/pull. If external guides are not feasible, consider a guided cylinder or rodless actuator to manage the bending moment and prevent premature seal and bearing wear.
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 SCJ50X400-30 FAQ
The rear cap contains an adjusting screw that acts as an internal, movable end stop for the piston. By turning the screw, you can shorten the stroke end by up to 30 mm from the nominal 400 mm maximum. This adjusts the physical stopping point of the piston, not the air pressure or speed, allowing for precise, on-machine tuning of the cylinder's extended position.
The push force is calculated using the full 50 mm bore area. At 0.5 MPa, the push force is 982 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N. The pull force is lower due to the 20 mm rod area, producing 825 N at 0.5 MPa. For holding a load safely without air pressure, an external rod lock or pilot-operated check valve is required, as the cylinder's air cushion and adjusting screw do not function as a brake.
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