The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ40X250-100S is a double-acting, single-rod pneumatic cylinder delivering a push force of 628 N at 0.5 MPa. Its defining feature is a 100 mm rear-cap adjusting screw, allowing the effective stroke to be field-tuned anywhere from 150 mm up to the nominal 250 mm maximum without replacing the unit. This model includes a built-in magnet for direct mounting of CMSG/DMSG/EMSG sensors.
With a 16 mm diameter piston rod and PT1/4 ports, the SCJ40 body length (A dimension) is 185 mm. The adjustable pneumatic cushion decelerates the piston smoothly at the stroke end, and the operating pressure ranges from 0.15 to 1.0 MPa. This specific configuration uses a standard TPU seal and PT threads, making it a versatile workhorse for commissioning and format-change tasks.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 100 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. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -100 | 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.
Ideal for machine builders who need to precisely dial in a stop position during initial system commissioning, with a generous 100 mm adjustment range to accommodate design uncertainties.
Quickly adapt the push stroke for different box or product sizes on a packaging line. The sensor-ready magnet provides end-of-stroke confirmation for each new format.
In clamping or pressing fixtures, the adjustable screw can be advanced over time to compensate for mechanical wear on tooling or seals, maintaining consistent clamping force without replacing the cylinder.
Choose the SCJ40 when you need to fine-tune the stroke end position within a 100 mm window during setup or product changeovers. If the 628 N push force at 0.5 MPa is insufficient, stepping up to an SCJ50 provides 982 N. For applications where the stroke is permanently fixed and never adjusted, a standard SC40 cylinder is a simpler, cost-effective alternative. A direct replacement must match the 40 mm bore, 250 mm nominal stroke, 100 mm adjust range, PT port thread, and the built-in magnet.
At a 250 mm stroke, ensure the load is guided to prevent excessive side-loading on the 16 mm rod. If the application involves unguided lateral forces, consider adding an external guide rail or switching to a guided cylinder series.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the push force is 628 N and the pull force is 528 N. The push force is higher due to the single-rod design. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1256 N.
Yes, provided the mounting and porting match. The SCJ40 body is slightly longer to house the adjusting mechanism. Ensure you have clearance for the rear screw and that the 100 mm adjustment range suits your process. The force output and rod diameter are identical to a standard SC40.
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