The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X100-40 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, 100mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X100-40 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, allowing the rear stop position to be fine-tuned by up to 40 mm without removing the unit from the machine. In this 40 mm bore class, the 16 mm diameter piston rod generates 628 N of push force and 528 N of pull force when supplied with 0.5 MPa air pressure, making it a practical actuator for moderate clamping, pressing, and positioning tasks.
This adjustable-stroke model uses the same tie-rod body construction as the fixed-stroke SC series, with a PT1/4 port, an M12x1.25 rod thread, and a 21 mm air cushion to decelerate the piston quietly. The body length (dimension A) is 185 mm, which is slightly longer than the fixed-stroke version to accommodate the rear adjusting screw mechanism.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X100-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 100 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.
| 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. |
| ×100 | 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.
The 40 mm rear adjustment screw lets technicians dial in the exact end-stop position during initial machine setup, eliminating the need for shims or external hard stops on assembly jigs.
On packaging lines that handle different box heights, the SCJ40X100-40 can be quickly re-adjusted to change the pusher stroke length, reducing downtime between batch runs.
In clamping fixtures, the adjustable stroke compensates for the gradual wear of contact pads, maintaining consistent clamping force without reprogramming the PLC or changing the cylinder.
Choose the SCJ40X100-40 when your application requires on-machine stroke tuning, such as adapting to different part thicknesses or taking up mechanical wear over time. If you need more force, stepping up to the 50 mm bore (SCJ50) provides 982 N of push force at the same 0.5 MPa pressure. For applications where the stroke is fixed and will never need adjustment, the standard SC40X100 is a more economical choice. This cylinder is a direct replacement for another AirTAC SCJ40X100-40 with a 40 mm adjustable range, PT thread, and basic mounting. If you require position sensing, specify the -S magnet option to use CMSG/DMSG sensors.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 40 mm bore cylinder delivers 628 N of push force on extension. The pull force on retraction is 528 N due to the area occupied by the 16 mm piston rod. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N.
Yes, the SCJ40X100-40 shares the same mounting footprint and port size as the SC40 series, but its body is slightly longer to house the rear adjusting screw. It is a direct dimensional match only for another SCJ40 cylinder with the same nominal stroke and adjustable range.
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