The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X450-40 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. Ø250mm bore, 450mm nominal stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCJ250X450-40 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering a substantial 24544 N of push force at just 0.5 MPa. Its rear-cap adjusting screw provides up to 40 mm of stroke-end shortening, allowing machine builders to fine-tune the piston stop position during commissioning or format changes without replacing the cylinder or adding external hard stops. The 50 mm diameter piston rod and PT1" porting deliver robust, high-flow performance for heavy-duty industrial tasks.
This ISO 6430 class tie-rod cylinder features an adjustable air cushion (40 mm length) to decelerate large inertial loads smoothly at the end of travel. The body length A(SCJ) is 409 mm, accommodating the rear adjustment mechanism within a compact envelope for its force class. The standard TPU seals provide reliable operation from -20 to +70 °C, making it a versatile workhorse for demanding pneumatic applications requiring precise, repeatable end-position tuning.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X450-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 | 24544 N | 23562 N |
| 0.7 MPa | 34361 N | — |
| Max (@1.0 MPa) | 5006 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. |
|---|---|
| 250 | Bore size in mm. |
| ×450 | 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.
Fine-tune the final pressing depth in a large hydraulic-pneumatic forming press. The 40 mm adjustment range allows operators to compensate for tooling wear or material thickness variations without disassembling the tool set.
Adjust the push-off stroke end on a heavy palletizing station. The SCJ250X450-40's adjustable screw lets technicians quickly recalibrate the stop position for different pallet heights or product layers during a format changeover.
Set the precise open position of a large damper gate in a bulk material handling system. The adjustable stroke allows for on-site flow calibration, ensuring the gate opens exactly the required amount for consistent material feed.
Select the SCJ250X450-40 when your application demands high force and the ability to dial in the exact stroke end position on-site. With a push force of 24544 N at 0.5 MPa, it handles very heavy loads. If your force requirement is lower, stepping down to a 200 mm bore reduces push force to 15708 N. For applications needing a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. The adjustable stroke is purely for setting the stroke end; it does not alter the cylinder's output force.
For this 450 mm stroke length, manage side loads carefully to prevent rod bending. Employ an external guide system or consider a guided cylinder if the load is not perfectly axial. A direct replacement must match the 250 mm bore, 450 mm nominal stroke, 40 mm adjust range, PT port thread, and basic mounting style. To add position sensing, specify the -S magnet option for use with CMSG/DMSG/EMSG sensors.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 24544 N, and the pull force is 23562 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5006 kgf. The push force is greater than the pull force because it is a single-rod cylinder.
The SCJ model includes a rear-cap adjusting screw that lets you shorten the stroke end by up to 40 mm in the field. A standard SC cylinder has a fixed stroke that cannot be adjusted. Choose the SCJ when you need to fine-tune the piston's stopping position without changing the cylinder.
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