Airtac SCJ40 Standard Cylinder SCJ40X50-50SLB
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-50SLB 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke50 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X50-50SLB
The SCJ40X50-50SLB is a double-acting, single-rod pneumatic cylinder featuring a rear-cap adjusting screw that provides a full 50 mm of field-adjustable stroke end control. This allows precise mechanical fine-tuning of the piston stop position without changing the cylinder, ideal for commissioning and format changeovers. With a 40 mm bore, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, using a 16 mm diameter piston rod.
This model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, enabling reliable end-of-stroke detection. It is also configured with an LB-style axial foot mount (F-SC40LB) for secure surface installation. The body length A(SCJ) is 185 mm, and the standard PT1/4 port ensures compatibility with common pneumatic fittings. The operating pressure range is 0.15–1.0 MPa, with an adjustable air cushion to decelerate the piston smoothly.
Airtac SCJ40 Standard Cylinder SCJ40X50-50SLB Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-50SLB |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 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 SCJ40X50-50SLB
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SCJ40X50-50SLB Is Used
Commissioning & Setup
The 50 mm adjustment range allows technicians to quickly dial in the exact stroke end position during initial machine setup, compensating for assembly tolerances without needing to swap out the cylinder.
Wear Compensation
In high-cycle clamping or pressing operations, the stroke end can be easily adjusted over time to compensate for tooling or pad wear, maintaining consistent clamping force and product quality.
Format Changeovers
Ideal for packaging or assembly lines running multiple product sizes, the adjustable stroke allows operators to quickly change the actuator's end position for different formats, reducing downtime significantly.
Is the Airtac SCJ40 Standard Cylinder SCJ40X50-50SLB the Right Cylinder?
Choose the SCJ40X50-50SLB when you need a compact 40 mm bore cylinder with a generous 50 mm adjustment range for fine-tuning the stroke end position. If your application requires higher force, consider stepping up to the 50 mm bore SCJ50 series, which offers 982 N of push force at 0.5 MPa. For applications where the stroke length is fixed and never needs adjustment, a standard SC fixed-stroke cylinder is a simpler, more cost-effective alternative.
This cylinder is a direct replacement for an existing AirTAC SCJ adjustable-stroke unit with a 40 mm bore, 50 mm nominal stroke, and a 50 mm adjustment range. Ensure the replacement matches the PT port thread, the LB foot mounting style, and the presence of the -S magnet for sensor compatibility. For strokes of 300 mm or more, evaluate side-loading on the 16 mm rod; an external guide or a guided cylinder may be necessary to 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 SCJ40X50-50SLB FAQ
The stroke is adjusted via a screw on the rear cap. Turning the screw changes the physical stop point for the piston's retraction, allowing you to shorten the effective stroke by up to 50 mm from its 50 mm nominal maximum. It does not adjust the cylinder's force or speed.
At the standard operating pressure of 0.5 MPa, the SCJ40X50-50SLB provides a push force of 628 N and a pull force of 528 N. The maximum push force at 0.9 MPa is 1130 N. The pull force is lower due to the area of the 16 mm piston rod.
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