Airtac SCJ40 Standard Cylinder SCJ40X225-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X225-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 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-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X225-50
The SCJ40X225-50 is a double-acting, single-rod pneumatic cylinder that puts stroke-end tuning directly in your hands. With a 50 mm rear adjusting screw, you can dial in the exact stopping position on the fly—no need to swap the cylinder or fabricate external hard stops. At 0.5 MPa, it delivers 628 N of push force and 528 N on the pull stroke, driven through a rigid 16 mm piston rod.
Built on the proven SC tie-rod platform, this 40 mm bore unit uses a PT1/4 port and includes a 21 mm air cushion to decelerate the piston smoothly. The body length A(SCJ) is 185 mm, keeping the envelope compact. The adjustable screw only sets the stroke end within the 50 mm band; it does not alter the cylinder's force rating or speed capability, which remains 30-800 mm/s with filtered air.
Airtac SCJ40 Standard Cylinder SCJ40X225-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X225-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 225 mm |
| Stroke adjustment | Up to 50 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 SCJ40X225-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ40X225-50 Is Used
Commissioning Fine-Tuning
During machine setup, use the 50 mm screw to creep the end position into perfect alignment with mating tooling or sensors, eliminating the need for shims or slotted brackets.
Format Changeover
On a packaging line, quickly adjust the push-off stroke when switching between box sizes. The rear screw lets a single operator change the stop in seconds without tools.
Wear Take-Up
In clamping or pressing fixtures, periodically advance the stroke end with the adjusting screw to compensate for pad wear, maintaining consistent clamp force without reprogramming.
Is the Airtac SCJ40 Standard Cylinder SCJ40X225-50 the Right Cylinder?
Step up to the 50 mm bore SCJ if your application needs more muscle—the SCJ50 delivers 982 N of push at the same 0.5 MPa. For purely fixed-stroke tasks where the end position never changes, the standard SC40 series eliminates the adjusting mechanism and offers a slightly shorter body. This SCJ40X225-50 replaces any AirTAC SCJ40 cylinder of the same 225 mm nominal stroke, 50 mm adjust range, PT thread, and basic mount. Because the 225 mm stroke is well within the 1200 mm maximum for this bore, rod buckling is not a primary concern under axial loads, but always align the load to avoid side forces.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ40X225-50 FAQ
At the standard 0.5 MPa operating pressure, it generates 628 N pushing and 528 N pulling. The push force is higher because the single rod reduces the piston area on the return side. Maximum force at 0.9 MPa reaches 1130 N of push.
Yes, if you need field-adjustable stroke end. The SCJ40X225-50 matches the SC40's 40 mm bore, PT1/4 port, and 16 mm rod. Ensure your mounting accepts the slightly longer SCJ body (185 mm) and the rear adjusting screw housing.
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