Airtac SCJ40 Standard Cylinder SCJ40X225-40
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X225-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø40mm bore, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke225 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X225-40
The SCJ40X225-40 is a 40 mm bore double-acting, single-rod cylinder with a field-adjustable stroke end, offering a 40 mm adjustment range from the nominal 225 mm maximum. This lets commissioning engineers fine-tune the stop position without swapping the cylinder or adding external hard stops. At 0.5 MPa it delivers 628 N push and 528 N pull, driven by a 16 mm diameter piston rod through PT1/4 ports.
Its rear-cap adjusting screw physically limits the piston's extension, making it ideal for format changeovers, wear take-up, or end-stop calibration on assembly fixtures. The tie-rod body length A is 185 mm plus stroke, and the 21 mm air cushion at each end decelerates the load smoothly. This is a genuine AirTAC SCJ unit built for repeatable, on-machine stroke tuning.
Airtac SCJ40 Standard Cylinder SCJ40X225-40 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X225-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 40 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 SCJ40X225-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ40X225-40 Is Used
Commissioning & Setup
The 40 mm adjustment screw lets technicians dial in the exact stop position during machine commissioning, eliminating the need to shim or reposition the cylinder mounting when the end-of-stroke sensor target needs fine-tuning.
Product Format Changeover
On packaging lines running multiple box sizes, the SCJ40X225-40's adjustable stroke allows a quick mechanical stop change between formats without swapping the actuator, reducing downtime during batch transitions.
Wear Compensation
In clamping or pressing fixtures where tooling or pads wear over time, the rear adjusting screw can be advanced to take up the resulting slack, maintaining consistent clamp force and part contact without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X225-40 the Right Cylinder?
Choose the SCJ40 when you need a mid-range force of 628 N push at 0.5 MPa and the ability to dial in the stroke end by up to 40 mm on the machine. If your load requires more force, step up to the 50 mm bore SCJ50 which provides 982 N push; for a lighter, more compact solution the 32 mm bore SCJ32 delivers 402 N. If the stroke length is fixed and never needs field adjustment, the standard SC40 fixed-stroke cylinder is a simpler, cost-effective alternative.
For replacement, match an AirTAC SCJ40 with a 225 mm nominal stroke, 40 mm adjust range, PT1/4 ports, and basic mounting. At this stroke length, ensure the rod is guided externally if significant side loads are present, or consider a guided cylinder to prevent rod bending and seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ40X225-40 FAQ
At the standard 0.5 MPa operating pressure, the cylinder generates 628 N of push force and 528 N of pull force. The push force is greater because the single piston rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the push force reaches 1130 N.
A rear-cap adjusting screw limits how far the piston rod can extend, shortening the stroke end by up to 40 mm from the 225 mm nominal maximum. It is a direct dimensional replacement for an SC40 of the same bore and stroke only if the mounting and port thread match. The SCJ body is slightly longer to house the adjustment mechanism, so check the A dimension (185 mm + stroke) for fit.
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