The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø250mm bore, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-50 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family, engineered for heavy-duty applications where the stroke end position must be fine-tuned on the machine. With a 250 mm bore and a nominal 350 mm stroke, this model provides a substantial 24544 N of push force at 0.5 MPa, reaching up to 44178 N at the maximum operating pressure of 0.9 MPa. The rear-cap adjusting screw offers a 50 mm field-adjustable range, allowing operators to shorten the stroke end without dismounting the cylinder or changing hard stops.
Built on a robust tie-rod design, this ISO 6430 class cylinder features a 50 mm diameter piston rod with an M42x2 knuckle thread and a PT1 inch port for high flow. The integrated adjustable air cushion, with a 33 mm cushion length, provides smooth deceleration for large inertial loads. The body length A(SCJ) is 409 mm, providing a compact footprint for its force class. This basic configuration uses the default TPU seal and PT thread, ideal for standard industrial environments from -20 to +70 °C.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 50 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. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
In large forming or laminating presses, the 50 mm adjust range allows operators to quickly compensate for variations in material thickness or tooling wear, ensuring consistent final press depth without mechanical shimming.
For high-level palletizers, the SCJ250's adjustable stroke fine-tunes the pusher's end position for different pallet heights or layer counts, simplifying format changeovers on a single high-force axis.
In a sawmill carriage, this cylinder acts as a programmable log stop. The 50 mm adjustment range allows the operator to precisely set the cutting length for different batches, with 24544 N of force to securely hold the log against the reference stop.
Select the SCJ250X350-50 when your application demands high force and the ability to dial in the stroke end position during commissioning or changeovers. If the 24544 N push force at 0.5 MPa is more than required, stepping down to a 200 mm bore reduces the push force to 15708 N, saving energy and physical space. For fixed-stroke applications without the need for field adjustment, the standard SC series is a more economical choice. This cylinder is a direct replacement for another AirTAC SCJ250 adjustable-stroke cylinder with a 350 mm nominal stroke, 50 mm adjust range, PT port, and basic mounting. For this 350 mm stroke length, be mindful of side-loading on the 50 mm rod; if the load is not perfectly guided, an external guide rail or a switch to a guided cylinder is strongly recommended to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
The output force is determined solely by the 250 mm bore and operating pressure, not the stroke adjustment. At 0.5 MPa, it delivers 24544 N push and 23562 N pull. The 50 mm adjustable stroke feature is a mechanical screw on the rear cap that sets the stroke end position; it does not change the cylinder's force output or its nominal 350 mm maximum stroke rating.
Yes, provided the bore, port thread (PT1 inch), and mounting match. The SCJ250X350-50 has a slightly longer body length A(SCJ) of 409 mm to accommodate the adjusting screw. It is a direct replacement for another AirTAC SCJ250 with a 350 mm nominal stroke and 50 mm adjust range. You can also use it as a fixed-stroke cylinder by setting the screw to its maximum extension.
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