Airtac SCJ40 Standard Cylinder SCJ40X500-40S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X500-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø40mm bore, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke500 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X500-40S
The SCJ40X500-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing a 40 mm adjustment range on its 500 mm nominal stroke. The 40 mm bore generates 628 N of push force at 0.5 MPa, making it suitable for medium-duty positioning tasks where the final stroke length must be fine-tuned during commissioning or changeover without swapping the cylinder. The built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
This model features a 16 mm diameter piston rod and PT1/4 ports, with a body length A of 185 mm. The adjustable screw only sets the stroke end position; it does not alter the cylinder's force output. The standard TPU seal offers a working temperature range of -20 to +70 °C. For a fixed-stroke alternative, see the SC series.
Airtac SCJ40 Standard Cylinder SCJ40X500-40S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X500-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 40 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 SCJ40X500-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×500 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ40X500-40S Is Used
Commissioning & Setup
The 40 mm adjustment range allows engineers to dial in the exact stop position during machine commissioning without needing multiple fixed-stroke cylinders or external hard stops.
Format Changeovers
Quickly adapt the stroke for different product sizes on a packaging line. The rear screw adjusts the push stroke end, enabling a fast mechanical changeover between production runs.
Wear Compensation
In long-running automation, the adjustable stroke can take up mechanical wear in tooling or grippers, maintaining precise positioning over the machine's life without replacing the actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X500-40S the Right Cylinder?
Select the SCJ40X500-40S when your application requires a 500 mm nominal stroke that can be shortened by up to 40 mm on the machine. If more force is needed, stepping up to a 50 mm bore provides 982 N of push force at the same 0.5 MPa pressure. For applications without the need for stroke adjustment, a fixed-stroke SC40X500 cylinder is a simpler, more cost-effective choice. This SCJ cylinder is a direct replacement for another AirTAC SCJ40X500-40S with a magnet and PT ports.
With a 500 mm stroke, rod buckling and side-loading are critical considerations. Ensure the load is guided externally, or consider using a guided cylinder if high side forces are present. The built-in magnet (-S suffix) is essential for integrating electronic position feedback into your control system.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ40X500-40S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The push force is higher because the single piston rod reduces the effective area on the return stroke. Maximum push force at 0.9 MPa is 1130 N.
You can, but you would lose the 40 mm field-adjustable stroke feature. The SCJ allows you to fine-tune the stroke end position after installation. A direct replacement must be an SCJ40X500-40S with a magnet and PT ports to ensure identical functionality and sensor compatibility.
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