Airtac SCJ50 Standard Cylinder SCJ50X75-30STC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X75-30STC 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke75 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X75-30STC
The SCJ50X75-30STC is a double-acting, single-rod pneumatic cylinder that delivers 982 N of push force at 0.5 MPa, making it a solid mid-range actuator for industrial tasks. Its defining feature is a rear-cap adjusting screw that provides up to 30 mm of stroke-end adjustment, allowing you to fine-tune the piston's stopping position on the fly without replacing the cylinder or adding hard stops.
This specific configuration includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion (TC) mount, supplied with the TCM1 bracket (F-SC50TC), to accommodate pivoting loads. The 20 mm diameter piston rod and 21 mm air cushion work together to provide smooth deceleration, while the PT1/4 ports ensure straightforward pneumatic connections.
Airtac SCJ50 Standard Cylinder SCJ50X75-30STC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X75-30STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 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 SCJ50X75-30STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SCJ50X75-30STC Is Used
Commissioning & Setup
The 30 mm adjustable stroke lets technicians dial in the exact end position during machine commissioning, eliminating the need to swap out fixed-stroke cylinders for minor positional tweaks.
Product Format Changeover
Ideal for packaging lines where a pusher stroke must be quickly shortened for a new box size. The rear screw adjusts the stop point in seconds, minimizing downtime between production runs.
Wear Compensation
In clamping or pressing operations, the stroke can be incrementally extended over time to compensate for tooling or pad wear, maintaining consistent contact force without reprogramming a controller.
Is the Airtac SCJ50 Standard Cylinder SCJ50X75-30STC the Right Cylinder?
Select the SCJ50X75-30STC when you need a 50 mm bore actuator with a nominal 75 mm stroke and the ability to shorten that stroke end by up to 30 mm for commissioning or format changes. If the 982 N push force at 0.5 MPa is insufficient, stepping up to a 63 mm bore (SCJ63) provides 1559 N of push force. For applications requiring a fixed, non-adjustable stroke, the standard SC50 series is a more economical choice.
This model is a direct replacement for any AirTAC SCJ adjustable cylinder with a 50 mm bore, 75 mm nominal stroke, 30 mm adjust range, PT ports, centre trunnion mounting, and a magnetic piston. For strokes of 300 mm or more, evaluate the rod's side-load capacity; an external guide or a guided cylinder is recommended to prevent rod bending under high lateral forces.
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 SCJ50X75-30STC FAQ
At the standard operating pressure of 0.5 MPa, this double-acting cylinder provides a push force of 982 N and a pull force of 825 N. The push force is higher because the single rod reduces the effective piston area on the return stroke. The maximum push force at 0.9 MPa is 1767 N.
A screw mechanism in the rear cap acts as an internal, adjustable end-stop for the piston. Turning the screw shortens the stroke end by up to 30 mm from the nominal 75 mm maximum. It adjusts the stopping position only and does not change the cylinder's force or speed.
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