The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X150-40 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, 150mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X150-40 is a double-acting, single-rod pneumatic cylinder with a 250 mm bore and a nominal 150 mm stroke, featuring a rear-cap adjusting screw that provides up to 40 mm of field-adjustable stroke reduction. This big-bore ISO 6430 class cylinder delivers a substantial 24544 N of push force at 0.5 MPa, making it suitable for heavy pressing, clamping, and forming applications where the final stop position must be tuned precisely on the machine.
A 50 mm diameter piston rod and a 40 mm air cushion at each end ensure robust, decelerated end-of-stroke performance. The cylinder body length A(SCJ) measures 409 mm, and the standard PT 1 inch ports supply the high flow needed for this force class. The adjustable stroke end lets commissioning engineers dial in the exact stroke without swapping the cylinder or adding external hard stops.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X150-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 150 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. |
| ×150 | 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.
During commissioning of a large assembly press, the 40 mm adjustment range allows the operator to fine-tune the final pressing depth to compensate for part tolerance stack-ups, ensuring consistent joint quality without reprogramming the machine.
In a waste compaction system, the adjustable stroke end is used to set the exact platen travel required for different material densities. The 24544 N push force at 0.5 MPa provides ample power for dense material compaction.
On a heavy-duty welding fixture, the stroke can be incrementally extended over time to compensate for wear on the clamp pads, maintaining consistent clamping force without needing to replace the cylinder or add shims.
Select the SCJ250 bore when your application demands push forces above 20000 N at standard plant pressure. If your load requires less force, stepping down to the SCJ200 bore reduces push force to 15708 N at 0.5 MPa, which may allow for a smaller, lighter cylinder and lower air consumption. For applications needing a fixed, non-adjustable stroke, the standard SC250 fixed-stroke cylinder is a simpler alternative.
A direct replacement must match the 250 mm bore, 150 mm nominal stroke, and 40 mm adjustable range, along with the PT port thread. The basic mounting configuration uses the cylinder body for direct attachment. At a 150 mm stroke, rod bending is not a primary concern for this large rod diameter under purely axial loads, but any significant side load requires an external guide rail or a switch to a guided cylinder assembly.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
A screw mechanism in the rear cap allows you to shorten the stroke end position by up to 40 mm. This sets a new mechanical stop for the piston, letting you fine-tune the stroke length in the field. It does not adjust the cylinder's force or speed, only the stroke end point.
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