Airtac SCJ40 Standard Cylinder SCJ40X25-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X25-30 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. Ø40mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke25 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X25-30
The SCJ40X25-30 is a double-acting, single-rod pneumatic cylinder from AirTAC’s SCJ adjustable-stroke family. With a 40 mm bore and a 16 mm piston rod, it delivers 628 N of push force at 0.5 MPa, making it a capable mid-range actuator. Its defining feature is the rear-cap adjusting screw, which provides up to 30 mm of field-adjustable stroke-end reduction, allowing technicians to fine-tune the 25 mm nominal stroke without swapping the cylinder.
This model uses PT1/4 ports and an M12x1.25 rod thread, with a standard TPU seal for operation from -20 to +70 °C. The body length A(SCJ) is 185 mm, and the air cushion is 21 mm. It is a genuine AirTAC component, built for reliable, repeatable stroke adjustment in compact automation tasks.
Airtac SCJ40 Standard Cylinder SCJ40X25-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X25-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 30 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCJ40 Standard Cylinder SCJ40X25-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 SCJ40 Standard Cylinder SCJ40X25-30 Is Used
Commissioning Fine-Tuning
The 30 mm adjustment screw lets integrators precisely set the stroke end on a new machine during initial setup, compensating for minor assembly variations without needing custom-length cylinders.
Wear Take-Up on Stops
In material handling, a mechanical stop can wear over time. The rear adjuster on the SCJ40X25-30 allows operators to quickly recover the lost stroke length, maintaining consistent part placement.
Small Format Changeover
For packaging or assembly machines running multiple product sizes, this cylinder's adjustable stroke enables a rapid end-position change between batches, reducing downtime compared to swapping fixed-stroke actuators.
Is the Airtac SCJ40 Standard Cylinder SCJ40X25-30 the Right Cylinder?
Choose the SCJ40X25-30 when you need to dial in a precise end position during commissioning or format changes. If 628 N of push force is insufficient, stepping up to the 50 mm bore (SCJ50) provides 982 N at the same pressure. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a more economical choice. This cylinder is a direct replacement for another AirTAC SCJ of the same 40 mm bore, 25 mm nominal stroke, and 30 mm adjustment range, with matching PT ports and basic mounting.
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 SCJ40 Standard Cylinder SCJ40X25-30 FAQ
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The maximum push force at 0.9 MPa is 1130 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the rod area.
A rear-cap screw physically limits the piston's retraction, shortening the stroke end by up to 30 mm from the 25 mm nominal maximum. Pick the SCJ when you need to fine-tune the stroke on the machine, such as during commissioning, for format changes, or to compensate for wear. Choose a fixed-stroke SC if the stroke length is permanent and field adjustment is not required.
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