Airtac SCJ40 Standard Cylinder SCJ40X180-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X180-50 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, 180mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke180 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X180-50
The SCJ40X180-50 is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal stroke of 180 mm, featuring a rear-cap adjusting screw that provides a 50 mm field-adjustable stroke range. This allows machine builders to fine-tune the stroke end position without swapping the cylinder, delivering 628 N of push force and 528 N of pull force at 0.5 MPa. The 16 mm diameter piston rod and PT1/4 ports make it a robust choice for industrial automation tasks requiring precise endpoint adjustment.
Engineered as a tie-rod cylinder with an adjustable air cushion, this unit has a body length A(SCJ) of 185 mm and operates smoothly within a speed range of 30-800 mm/s. The standard TPU seal ensures reliable performance from -20 to +70 °C. This genuine AirTAC SCJ cylinder is the correct replacement for any machine using an SCJ40 with a 180 mm nominal stroke and a 50 mm adjustment range, matching the original's port, mounting, and cushion specifications exactly.
Airtac SCJ40 Standard Cylinder SCJ40X180-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X180-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 180 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 SCJ40X180-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×180 | 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 SCJ40X180-50 Is Used
Commissioning & Setup
Ideal for machine commissioning where the exact stroke length must be empirically determined. The 50 mm adjustment screw allows fine-tuning of the end stop without re-plumbing or swapping cylinders, saving significant setup time.
Product Changeover
Used on packaging lines to adjust a pusher or diverter stroke for different product sizes. The field-adjustable stroke enables a quick format change by simply turning the rear screw to set a new stop position within the 50 mm range.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can compensate for tooling or pad wear over time. The operator can extend the stroke end slightly to maintain consistent clamping force without replacing the cylinder or adding shims.
Is the Airtac SCJ40 Standard Cylinder SCJ40X180-50 the Right Cylinder?
Select the SCJ40X180-50 when you need a mid-range force actuator with the ability to dial in the stroke end during commissioning or changeovers. If your application requires more force, stepping up to a 50 mm bore (SCJ50) provides 982 N of push force at the same 0.5 MPa pressure. For applications needing a fixed, non-adjustable stroke, the standard SC series offers a simpler, more cost-effective solution. If the load must be guided or side loads are present, consider an external guide rail or a guided cylinder to protect the rod bearing.
This model is a direct dimensional and performance match for an AirTAC SCJ40X180-50 with basic mounting, PT ports, and no magnet. When replacing, ensure the new cylinder matches the 50 mm adjustment range, as a different adjust value will alter the machine's stroke endpoint. For position sensing, a model with the -S suffix is required to accept CMSG/DMSG sensors.
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 SCJ40X180-50 FAQ
At the standard operating pressure of 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. Because it is a single-rod cylinder, the pull force is lower due to the area of the 16 mm rod.
Physically, the SCJ40X180-50 will mount in the same space, but its body length is slightly longer to accommodate the adjusting screw. Functionally, it adds the ability to shorten the stroke by up to 50 mm. It is a direct replacement only if your application can accept the longer body and you need the adjustable stroke feature.
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