The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X300-100 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, 300mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X300-100 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family, delivering a substantial 24544 N push force at 0.5 MPa. Its defining feature is a rear-cap adjusting screw that provides a 100 mm field-adjustable range, allowing you to fine-tune the stroke end position for commissioning, format changes, or wear compensation without removing the cylinder. The 250 mm bore uses a 50 mm diameter piston rod, G1 ports, and an M42x2 rod thread, with a 40 mm air cushion to decelerate the massive payloads typical of this ISO 6430 class tie-rod cylinder.
This genuine AirTAC actuator is built for demanding industrial environments where a 300 mm nominal stroke needs precise, on-machine end-stop adjustment. The body length A(SCJ) is 409 mm, and the unit operates on 40 µm filtered air from 0.15 to 1.0 MPa. The push force is significantly higher than the pull force (23562 N at 0.5 MPa) due to the single-rod design, a critical factor when sizing for a load. The 100 mm adjustment range acts on the stroke end only, shortening the maximum travel without altering the cylinder's force output or speed capability.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X300-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 300 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. |
| ×300 | 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 forming or stamping presses, the 100 mm adjustable stroke allows operators to quickly set the final press depth for different tooling or material thicknesses without disassembling the tooling, using the cylinder's 24544 N push force.
For a conveyor belt take-up station, the SCJ250X300-100 provides the high force needed for tensioning, while the rear adjusting screw allows maintenance crews to easily take up belt stretch over time, maintaining optimal tension without replacing the cylinder.
When actuating a large industrial gate or butterfly valve, the 100 mm adjustment range is used during commissioning to perfectly calibrate the valve's open or closed position, compensating for linkage tolerances in the field.
Select the SCJ250X300-100 when a 300 mm stroke must be dialed in precisely on the machine; the 100 mm adjustment range provides ample room for setup and process tweaks. For applications requiring even higher force, the next step up in this series is not available, as 250 mm is the largest bore; instead, consider increasing operating pressure up to the 1.0 MPa maximum, which yields a push force of 44178 N. If the adjustable stroke is not required, a fixed-stroke SC250X300 simplifies the bill of materials. For a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with a 250 mm bore, 300 mm nominal stroke, a 100 mm adjust range, PT ports, and the same basic mounting configuration.
Given the 300 mm stroke and the substantial rod mass, managing side loads is essential to prevent rod bending and premature seal wear. For applications with off-center loads, an external guide rail or a guided cylinder should be used to absorb the transverse forces and ensure the cylinder's rated life is achieved.
Adjustable-stroke checklist
The maximum push force is 24544 N at 0.5 MPa and 44178 N at the maximum operating pressure of 1.0 MPa. The adjustable stroke feature does not change the cylinder's force output; it only sets the physical end position of the piston stroke, shortening it by up to 100 mm.
A fixed-stroke SC250X300 will mount and function, but you will lose the 100 mm field-adjustable stroke feature. For a true replacement that maintains the ability to fine-tune the stroke end on the machine, you must use an SCJ model with the same 250 mm bore, 300 mm nominal stroke, and a 100 mm adjustment range.
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