Airtac SCJ40 Standard Cylinder SCJ40X90-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X90-50 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, 90mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke90 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X90-50
The SCJ40X90-50 is a double-acting, single-rod pneumatic cylinder that puts precise stroke-end tuning directly on the machine. Its rear-cap adjusting screw provides a 50 mm adjustable range, letting you dial in the exact 90 mm nominal stroke end for commissioning or format changes without swapping the cylinder. The 40 mm bore delivers 628 N of push force at 0.5 MPa, driven by a 16 mm diameter piston rod, making it a strong candidate for medium-duty clamping and positioning tasks.
Built on the rugged AirTAC SC tie-rod platform, this adjustable-stroke variant uses a PT1/4 port and an M12x1.25 rod thread for straightforward integration. The 21 mm air cushion at each end decelerates the piston smoothly, and the body length A(SCJ) is 185 mm. This model is configured with a basic mount, standard TPU seals, and PT threads, ready to accept the SCJ mounting subset for flexible installation.
Airtac SCJ40 Standard Cylinder SCJ40X90-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X90-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 90 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 SCJ40X90-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×90 | 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 SCJ40X90-50 Is Used
Commissioning & Setup
Fine-tune the end position of a stopper or clamp during machine commissioning. The 50 mm adjustment range allows operators to dial in the perfect stroke without needing to machine custom stops or swap cylinders.
Adjustable Part Stops
Use as an adjustable end-stop on a conveyor line for different product sizes. The rear screw quickly changes the stopping point by up to 50 mm, enabling rapid format changeovers in packaging or assembly.
Wear Compensation
In high-cycle pressing or clamping, use the stroke adjustment to take up mechanical wear on tooling or pads. This maintains consistent clamping force over time without reprogramming the machine control system.
Is the Airtac SCJ40 Standard Cylinder SCJ40X90-50 the Right Cylinder?
Choose the SCJ40X90-50 when your application requires on-the-fly stroke adjustment up to 50 mm. If you need more force, stepping up to the 50 mm bore (SCJ50) provides 982 N of push at 0.5 MPa. For a simpler, fixed-stroke solution without the rear adjusting screw, the standard SC40X90 is the direct alternative. This cylinder is a direct replacement for any AirTAC SCJ40X90-50 with the same bore, nominal stroke, 50 mm adjust range, PT ports, and basic mounting. For strokes of 90 mm, rod deflection is minimal under axial loads, but always align the load to prevent side-loading.
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 SCJ40X90-50 FAQ
At 0.5 MPa, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N.
A rear-cap screw mechanically limits the piston's stroke end by up to 50 mm from the nominal 90 mm maximum. You choose the SCJ when you need to fine-tune the stroke position on the machine for setup, product changeovers, or to compensate for wear, without replacing the cylinder. If your stroke is fixed and never needs field adjustment, the standard SC40 cylinder is a more cost-effective choice.
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