The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-20 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, 175mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X175-20 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. With a 250 mm bore and a 50 mm diameter piston rod, it delivers a substantial 24544 N of push force and 23562 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks where the final stroke length must be dialled in precisely during commissioning or after tooling wear.
This ISO 6430 class tie-rod cylinder features an adjustable air cushion (40 mm length) for smooth deceleration and operates on filtered air at 0.15-1.0 MPa. The body length A(SCJ) is 409 mm, and the standard G1 port thread ensures straightforward plumbing. The 20 mm adjustment range lets technicians fine-tune the end position without swapping the cylinder or adding external hard stops, reducing downtime on large-scale equipment.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 175 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. |
| ×175 | 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.
In large forming or stamping presses, the 20 mm adjustment range allows operators to compensate for tooling wear or material thickness variations without disassembling the tool set, maintaining consistent part quality with the cylinder's 24544 N push force.
Controls a diverter gate on a mining or aggregate conveyor. The adjustable stroke lets technicians fine-tune the gate opening to regulate material flow precisely, and the 250 mm bore provides the necessary force to move heavy, sticky materials.
During the commissioning of heavy industrial machinery like steel coil handlers, the rear adjusting screw allows for rapid, iterative stroke-end tuning to synchronise the cylinder's movement with other large actuators, saving hours of mechanical rework.
Choose the SCJ250X175-20 when you need high force capacity with the ability to fine-tune the stroke end position on the machine. If your force requirement is lower, stepping down to the 200 mm bore SCJ200 series (15708 N push at 0.5 MPa) can reduce air consumption and physical size. For applications where the stroke is fixed and never needs field adjustment, the standard SC250 fixed-stroke cylinder offers a simpler, more compact solution without the rear adjusting mechanism. A direct replacement must match the 250 mm bore, 175 mm nominal stroke, 20 mm adjustment range, PT port thread, and basic mounting style. For strokes of 175 mm, side-loading is generally minimal, but for any application introducing off-axis forces, an external guide rail or a guided cylinder should be considered to protect the rod and bearing from bending moments.
Adjustable-stroke checklist
The push force is 24544 N at 0.5 MPa, 34361 N at 0.7 MPa, and 44178 N at the maximum operating pressure of 0.9 MPa. The pull force is 23562 N at 0.5 MPa due to the 50 mm rod reducing the effective piston area on the return stroke.
Yes, this is a direct replacement for any AirTAC SCJ250 adjustable-stroke cylinder with a 175 mm nominal stroke and a 20 mm adjustment range. Ensure the port thread (PT), mounting style (basic), and magnet option (none) match your existing unit. The adjustable stroke feature is identical, allowing you to set the same end position.
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