The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X125-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø250mm bore, 125mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X125-100 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke series. With a 250 mm bore and a nominal 125 mm stroke, it delivers a substantial 24544 N of push force at 0.5 MPa. The defining feature is the rear-cap adjusting screw, which provides a 100 mm range to fine-tune the stroke end position without removing the cylinder from the machine.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod and a 1-inch PT port for high flow. The body length A is 409 mm, and it includes an adjustable air cushion with a 40 mm cushion length to decelerate heavy loads. The operating pressure range is 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa, making it suitable for demanding industrial force applications.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X125-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 100 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. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -100 | 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 hydraulic-style pneumatic press replacements, the 100 mm adjustment screw allows operators to quickly compensate for variations in material thickness or tooling wear, setting a precise bottom-dead-center without reprogramming.
For controlling a heavy diverter gate on a mining or aggregate conveyor, the SCJ250's 24544 N push force at 0.5 MPa can move the gate, and the adjustable stroke allows fine-tuning the gate's open position to regulate material flow precisely.
In wood or composite panel processing, this cylinder can be used for clamping. The 100 mm stroke adjustment range is perfect for adapting the clamp's final position to different panel sizes during batch changeovers, ensuring consistent pressure without crushing.
Select the SCJ250X125-100 when you need high force and the ability to dial in the exact stroke end during setup or changeovers. If your application requires even more force, the next standard bore step up would require a custom solution, as 250 mm is the largest standard SCJ bore. For a lower force class, an SCJ200 delivers 15708 N of push force at the same pressure. The adjustable stroke is ideal for commissioning, but if a fixed, repeatable stroke is all that's needed, a standard SC cylinder offers a simpler, more cost-effective solution. For this 125 mm stroke, side-loading is not a primary concern, but always ensure the load is guided if any lateral forces are present to prevent premature rod bearing wear. A direct replacement must match the 250 mm bore, 125 mm nominal stroke, 100 mm adjust range, PT port thread, and basic mounting style.
Adjustable-stroke checklist
As a single-rod cylinder, push and pull forces are different. At the standard 0.5 MPa operating pressure, 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 increases to 44178 N.
The 100 mm adjustment is a mechanical screw in the rear cap that limits the piston's retraction, effectively shortening the stroke end by up to 100 mm from the nominal 125 mm maximum. The SCJ250X125-100 is a direct dimensional replacement for another AirTAC SCJ cylinder with the same 250 mm bore, 125 mm nominal stroke, and 100 mm adjustment range. It cannot be directly replaced by a fixed-stroke SC cylinder if the stroke adjustability is required.
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