The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-40S 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, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-40S is a heavy-duty double-acting single-rod cylinder with a field-adjustable stroke end. Its rear-cap screw provides up to 40 mm of adjustment, letting you fine-tune the stop position without replacing the cylinder. This model delivers a substantial 24544 N of push force at 0.5 MPa, rising to 44178 N at the maximum operating pressure of 0.9 MPa.
Equipped with a built-in magnet (-S suffix), it is ready for CMSG, DMSG, or EMSG reed and solid-state sensors to be clamped directly onto the tie-rod barrel. The 50 mm diameter piston rod and PT1" port size handle high flow rates, while the 40 mm air cushion decelerates large inertial loads smoothly. This ISO 6430 class cylinder has a body length of 409 mm.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 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. |
| ×350 | 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.
Adjust the stroke end by up to 40 mm to accommodate different material thicknesses or tooling wear in a large stamping or forming press, ensuring consistent final part dimensions.
Fine-tune the opening of a diverter gate or hopper door on a conveyor line. The adjustable screw sets the precise gate opening for flow control without changing the actuator.
During the commissioning of heavy industrial equipment, use the 40 mm adjustment range to perfect the actuator's end position in situ, compensating for accumulated assembly tolerances.
Choose the SCJ250X350-40S when you need to precisely dial in a long stroke end position for a heavy forming or clamping operation. If 24544 N of push force at 0.5 MPa is insufficient, stepping up is not possible as this is the largest bore in the series. For a lighter, more compact solution, the SCJ200 bore provides 15708 N of push force at the same pressure. If the stroke does not require field adjustment, a fixed-stroke SC250X350 will be more economical.
For replacement, match the 250 mm bore, 350 mm nominal stroke, 40 mm adjust range, PT port thread, and the built-in magnet. At this 350 mm stroke, ensure the rod is supported against side loads; an external guide rail or a self-guided cylinder is recommended to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
The push force is 24544 N at 0.5 MPa, 34361 N at 0.7 MPa, and reaches a maximum of 44178 N at the 0.9 MPa operating pressure limit. The pull force is slightly lower at 23562 N at 0.5 MPa due to the 50 mm rod.
A screw in the rear end cap acts as an internal, adjustable stop for the piston. Turning the screw changes the stroke end position within a 40 mm range, allowing you to shorten the 350 mm nominal stroke without affecting the cylinder's force or speed.
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