Airtac SCJ40 Standard Cylinder SCJ40X25-10
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X25-10 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 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-10 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X25-10
The SCJ40X25-10 is a double-acting, single-rod pneumatic cylinder that lets you fine-tune the stroke end position by up to 10 mm without removing the cylinder from the machine. With a 40 mm bore and 25 mm nominal stroke, it delivers 628 N of push force at 0.5 MPa, making it a practical choice for light pressing, clamping, and ejection tasks where the final stop point needs field adjustment.
This model uses a 16 mm diameter piston rod and PT1/4 ports, with a 21 mm air cushion at each end to decelerate the piston quietly. The body length A(SCJ) is 185 mm, slightly longer than a fixed-stroke SC of the same envelope. Operating pressure spans 0.15–1.0 MPa, and the standard TPU seals work reliably from -20 to +70 °C.
Airtac SCJ40 Standard Cylinder SCJ40X25-10 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X25-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 10 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 SCJ40X25-10
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -10 | 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 SCJ40X25-10 Is Used
Commissioning & Setup
Dial in the exact stop position during machine bring-up without swapping cylinders or machining external stops, saving hours of mechanical rework.
Small-Part Ejection
Fine-tune the ejector stroke end to accommodate varying product heights on a packaging line, ensuring consistent part removal without impact damage.
Clamping with Wear Compensation
Adjust the clamp stroke end as gripper pads or tooling wear down, maintaining consistent clamping force without reprogramming the PLC.
Is the Airtac SCJ40 Standard Cylinder SCJ40X25-10 the Right Cylinder?
Step up to the SCJ50 series if you need 982 N of push force at 0.5 MPa; step down to the SCJ32 for 402 N when space or force requirements are lower. Choose this adjustable-stroke SCJ over a fixed-stroke SC when your application requires commissioning flexibility, format changeovers, or wear take-up at the stroke end—the rear screw eliminates the need for external hard stops. For a direct replacement, match an SCJ40 with a 25 mm nominal stroke, 10 mm adjust range, PT thread, and basic mounting. If your stroke exceeds 300 mm, consider an external guide rail or a guided cylinder to protect the 16 mm rod from side loads.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-10)
- ✓ 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 SCJ40X25-10 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (the difference is due to the 16 mm single rod). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The rear adjusting screw changes only the stroke end position, not the output force.
Yes, the SCJ shares the same bore, rod, port, and mounting footprint as the SC, but the body is slightly longer to house the adjusting screw. Ensure you have clearance for the rear screw mechanism and match the port thread (PT) and mounting style. The SCJ is the direct adjustable-stroke equivalent when you need field-tunable stroke end positioning.
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