Airtac SCJ50 Standard Cylinder SCJ50X300-30
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-30 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke300 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X300-30
The SCJ50X300-30 is a 50 mm bore double-acting, single-rod pneumatic cylinder that integrates a rear-cap adjusting screw, allowing the stroke end position to be fine-tuned by up to 30 mm without replacing the unit. With a 20 mm diameter piston rod and PT1/4 ports, it delivers 982 N of push force at 0.5 MPa, making it a robust mid-range actuator for applications where the stroke length must be dialled in during commissioning or format changes.
The adjustable-stroke design uses a physical stop screw to shorten the nominal 300 mm stroke, providing a repeatable mechanical end point. The cylinder body length A(SCJ) is 194 mm plus stroke, and it features an adjustable air cushion of 21 mm for smooth deceleration. This model is built with the standard TPU seal and PT threads, suiting general industrial environments from -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X300-30 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 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 SCJ50X300-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 SCJ50X300-30 Is Used
Commissioning & Fine-Tuning
The 30 mm adjustment range lets technicians precisely set the end-of-stroke position during machine setup, eliminating the need to shim or reposition the entire cylinder to achieve the correct stopping point.
Product Format Changeover
On packaging or sorting lines, operators can quickly adjust the stroke to accommodate different product sizes, reducing downtime between batches without swapping out the 50 mm bore actuator.
Wear Compensation
In high-cycle clamping or pressing operations, the adjusting screw can be advanced over time to compensate for tooling wear, maintaining consistent contact pressure without reprogramming the machine control system.
Is the Airtac SCJ50 Standard Cylinder SCJ50X300-30 the Right Cylinder?
Choose the SCJ50X300-30 when your application requires a 300 mm maximum stroke that can be reduced by up to 30 mm in the field. If you need more force, stepping up to the 63 mm bore provides 1559 N of push at 0.5 MPa; for a lighter, more compact solution, the 40 mm bore delivers 628 N. For a fixed, non-adjustable stroke, the standard SC series is a more economical alternative. As a direct replacement, match the 50 mm bore, 300 mm nominal stroke, 30 mm adjust range, PT port thread, and basic mounting. For strokes of 300 mm or more, be mindful of side loading on the 20 mm 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.
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 SCJ50X300-30 FAQ
At the standard operating pressure of 0.5 MPa, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force due to the single-rod design. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 2000 N (200 kgf).
A rear-cap screw physically limits the piston's retraction stroke, allowing you to shorten the stroke end by up to 30 mm from the 300 mm nominal maximum. It is a direct replacement for any AirTAC SCJ50 cylinder with the same 300 mm nominal stroke, 30 mm adjust range, PT ports, and basic mounting configuration.
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