Airtac SCJ50 Standard Cylinder SCJ50X55-30
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X55-30 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, 55mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke55 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X55-30
The SCJ50X55-30 is a double-acting, single-rod pneumatic cylinder from AirTAC's tie-rod series, engineered for applications demanding field-adjustable stroke end positioning. With a 50mm bore and a 20mm diameter piston rod, it delivers a push force of 982 N at 0.5 MPa, making it a robust mid-range actuator. The key differentiator is its rear-cap adjusting screw, which provides up to 30 mm of stroke-end reduction, allowing you to fine-tune the 55mm nominal stroke without replacing the cylinder or adding external hard stops.
This model features a PT1/4 port, an M16x1.5 rod thread, and an adjustable air cushion with a 21mm cushion length for smooth deceleration. The body length A(SCJ) is 194 mm. Operating on filtered air from 0.15 to 1.0 MPa, it supports a maximum push force of 1767 N at 0.9 MPa and speeds of 30-800 mm/s. As a genuine AirTAC component, it ensures reliable performance for commissioning, format changes, and wear take-up in industrial automation.
Airtac SCJ50 Standard Cylinder SCJ50X55-30 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X55-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 55 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 SCJ50X55-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×55 | 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 SCJ50X55-30 Is Used
Commissioning & Setup
During machine commissioning, the 30mm adjustment screw allows engineers to precisely dial in the actuator's end-stop without mechanical modifications, speeding up the integration of new tooling.
Product Format Changeover
On a packaging line, the stroke can be quickly shortened to accommodate a different box size or product format, eliminating the need to swap out the cylinder or reposition external sensors.
Wear Compensation
In clamping or pressing operations, the adjustable stroke can be used to take up mechanical wear on contact surfaces or tooling over time, maintaining consistent clamp force and position.
Is the Airtac SCJ50 Standard Cylinder SCJ50X55-30 the Right Cylinder?
Select the SCJ50X55-30 when your application requires a mid-range force actuator with the flexibility to adjust the stroke end position on the machine. If your load demands more force, stepping up to the 63mm bore (SCJ63) provides 1559 N of push force at 0.5 MPa; for a lighter, more compact solution, the 40mm bore (SCJ40) offers 628 N. This adjustable-stroke model is the correct choice over a fixed-stroke SC cylinder when you anticipate needing to dial in the exact end-stop during setup or for different product runs. A direct replacement must match the 50mm bore, 55mm nominal stroke, 30mm adjustment range, PT port thread, and basic mounting configuration.
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 SCJ50X55-30 FAQ
The theoretical push force at 0.5 MPa is 982 N, and the pull force is 825 N (accounting for the 20mm rod area). At the maximum operating pressure of 1.0 MPa, the push force reaches 1767 N. Always apply a safety factor for real-world dynamic loads.
A screw mechanism in the rear cap allows you to shorten the stroke end position by up to 30 mm from the 55mm nominal maximum. This is a mechanical stop adjustment for the piston's retraction, not a force or speed control. It is ideal for fine-tuning end positions without reprogramming a controller.
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