Airtac SCJ40 Standard Cylinder SCJ40X240-50S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X240-50S 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, 240mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke240 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X240-50S
The SCJ40X240-50S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, allowing a 50 mm fine-tuning range on the 240 mm nominal stroke. The rear-cap adjusting screw lets operators dial in the exact stroke end position without swapping the cylinder, which is ideal for commissioning trials or format changeovers. Its 16 mm diameter piston rod and PT1/4 ports deliver a push force of 628 N at 0.5 MPa, rising to 1130 N at the maximum operating pressure of 0.9 MPa.
This model includes a built-in magnet (suffix -S), enabling direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. The standard TPU seal operates from -20 to +70 °C, and the body length A(SCJ) is 185 mm. As a genuine AirTAC component, it provides consistent cushioning performance with a 21 mm adjustable air cushion at each end.
Airtac SCJ40 Standard Cylinder SCJ40X240-50S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X240-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 240 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 SCJ40X240-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×240 | 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 SCJ40X240-50S Is Used
Commissioning & Setup
Fine-tune the end-stop position during machine commissioning with the 50 mm adjustment screw, eliminating the need to fabricate custom mechanical stops for each new tooling setup.
Product Changeover
Quickly adapt stroke length for different product sizes on packaging or sorting lines. The magnetic piston allows sensors to be repositioned to match the new stroke end.
Wear Compensation
Adjust the stroke end to take up mechanical wear in clamping or pressing fixtures over time, maintaining consistent contact force without replacing the cylinder or adding shims.
Is the Airtac SCJ40 Standard Cylinder SCJ40X240-50S the Right Cylinder?
Choose the SCJ40 bore when your application needs up to 628 N of push force at standard plant air pressure; for lighter actuation, the SCJ32 delivers 402 N at 0.5 MPa, while stepping up to an SCJ50 provides 982 N. The 50 mm adjustable stroke range is particularly useful for applications requiring frequent end-position tweaks, such as conveyor diverters or clamping stations. If your stroke is fixed and never needs field adjustment, a standard SC fixed-stroke cylinder reduces complexity.
For replacement, match this exact configuration: SCJ40 bore, 240 mm nominal stroke, 50 mm adjust range, PT port thread, basic mounting, and the -S magnet option. At a 240 mm stroke, the rod is well-supported, but for strokes beyond 300 mm, consider an external guide or a guided cylinder to manage side loads and prevent rod bending.
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 SCJ40X240-50S 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 rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 128 kgf. Always use the push force for clamping and pressing applications.
You can replace another AirTAC SCJ40 with the same bore, nominal stroke, and 50 mm adjust range. It is not dimensionally interchangeable with ISO 15552 cylinders. Ensure your mounting (basic), port thread (PT), and magnet requirement (-S) match, and verify the 185 mm body length fits your space envelope.
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