The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X240-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 240mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ40X240-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, delivering 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa). Its rear-cap adjusting screw provides up to 20 mm of stroke-end shortening, allowing fine-tuning for commissioning, format changes, or wear take-up without replacing the cylinder. The built-in magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
This 40 mm bore model uses a 16 mm diameter piston rod and PT1/4 ports, with a body length A of 185 mm. The adjustable air cushion decelerates the piston smoothly at both ends, protecting the end caps during high-speed operation. The 240 mm nominal stroke is well within the bore's 1200 mm maximum standard stroke, making it a versatile choice for medium-reach positioning tasks where a fixed stroke would be too rigid.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X240-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 240 mm |
| Stroke adjustment | Up to 20 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×240 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Fine-tune the end-stop position during machine commissioning without swapping cylinders. The 20 mm adjustment range allows operators to quickly compensate for assembly tolerances and achieve perfect alignment.
Adjust the stroke end to accommodate different product sizes on a packaging line. The SCJ40X240-20S eliminates the need for mechanical stops, speeding up format changeovers and reducing downtime.
In clamping or pressing applications, use the rear screw to take up stroke loss caused by tooling wear over time, maintaining consistent clamping force and process quality without disassembling the actuator.
Choose the SCJ40X240-20S when you need to dial in a precise stroke end position on the machine. If 628 N of push force is insufficient, stepping up to a 50 mm bore (SCJ50) provides 982 N of push force at the same 0.5 MPa pressure. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a more economical alternative. This model is a direct replacement for any AirTAC SCJ40X240-20S cylinder with a PT port and built-in magnet. For strokes of 300 mm or more, evaluate side-load conditions; an external guide rod or a guided cylinder may be necessary to prevent rod bending.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the cylinder provides 628 N of push force and 528 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1130 N. The pull force is lower due to the area of the 16 mm piston rod.
Yes, if you need the ability to fine-tune the stroke end. The SCJ40X240-20S is a direct dimensional replacement for another AirTAC SCJ40 cylinder with the same 240 mm nominal stroke and 20 mm adjustment range. Ensure the port size (PT1/4) and magnet sensor option match your existing setup.
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