The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X150-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø250mm bore, 150mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X150-20 is a heavy-duty double-acting, single-rod cylinder from the ISO 6430 class, delivering a substantial 24544 N of push force at just 0.5 MPa. Its rear-cap adjusting screw provides a 20 mm field-adjustable stroke range, letting you fine-tune the end position without swapping the cylinder—ideal for large-scale automation where precise mechanical stops are critical.
With a 50 mm piston rod, PT1" ports, and a 40 mm air cushion, this 250 mm bore cylinder handles demanding deceleration loads. The body length A(SCJ) is 409 mm, and the maximum theoretical force reaches 5006 kgf at 1.0 MPa, making it a powerhouse for pressing, clamping, and heavy-duty positioning tasks.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X150-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 150 mm |
| Stroke adjustment | Up to 20 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. |
| -20 | 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.
The 20 mm adjustable stroke allows operators to dial in the exact press depth for bearings or bushings, compensating for part tolerances without reprogramming the entire machine.
In woodworking or metal fabrication, the rear screw provides quick stroke-end adjustment to accommodate different material thicknesses, ensuring consistent clamp force without mechanical stops.
On heavy pallet conveyor systems, the adjustable stroke lets maintenance teams take up wear on the stopper gate mechanism over time, extending service intervals and preventing jams.
Choose the SCJ250 when your application requires immense force in a tie-rod package. If 24544 N at 0.5 MPa is overkill, 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. This model is a direct replacement for any AirTAC SCJ250X150-20 with PT ports and basic mounting. For strokes over 300 mm, always use an external guide or a guided cylinder to protect the 50 mm rod from side-load bending.
Adjustable-stroke checklist
At 0.5 MPa, this double-acting cylinder provides 24544 N pushing and 23562 N pulling. At the maximum operating pressure of 0.9 MPa, the push force increases to 44178 N. The theoretical maximum at 1.0 MPa is 5006 kgf.
The rear-cap screw mechanically limits the piston's stroke end by up to 20 mm, giving you a shorter effective stroke than the nominal 150 mm. It is a position-setting feature only—it does not adjust force or speed. Use flow controls on your valve for speed regulation.
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