The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-40S 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, 175mm nominal stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCJ250X175-40S is a large-bore, double-acting single-rod pneumatic cylinder engineered for heavy-duty applications where the end-of-stroke position must be precisely tuned on the machine. With a 250 mm bore, it delivers a substantial 24544 N of push force at 0.5 MPa, and the integrated rear adjusting screw provides up to 40 mm of stroke-end retraction from the 175 mm nominal maximum, allowing operators to dial in the exact stopping point without disassembling the cylinder.
This model includes a built-in magnet (suffix -S), enabling direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for reliable, non-contact position feedback. The cylinder uses a 50 mm diameter piston rod with an M42x2 thread, PT 1 inch ports, and a 40 mm air cushion to decelerate large inertial loads. Its body length A is 409 mm, and it operates within the standard -20 to +70 °C temperature range with the default TPU seals.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 175 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. |
| ×175 | 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.
Adjust the stroke end by up to 40 mm to set a precise final pressing depth on large forming or assembly fixtures, compensating for tooling wear or material thickness variations without reprogramming the press.
Use the adjustable stroke to create a physical end-stop for heavy pallets or steel plates on a conveyor line. The 24544 N push force at 0.5 MPa ensures the cylinder can securely position massive loads.
During the commissioning of heavy industrial equipment, the 40 mm adjustment range allows engineers to quickly optimize the stroke end for different tooling sets, saving significant setup time compared to swapping fixed-stroke cylinders.
This ISO 6430 class cylinder is the right choice when you need the highest force in the SCJ range for pressing, clamping, or lifting heavy assemblies. For a step down in force, the SCJ200X175-40 provides 15708 N of push at 0.5 MPa, which may be sufficient for less demanding tooling. If the stroke does not require field adjustment, a fixed-stroke SC250X175 simplifies the setup. A direct replacement must match the 250 mm bore, 175 mm nominal stroke, 40 mm adjust range, PT port thread, and the -S magnet option. For this 175 mm stroke, rod bending is not a primary concern given the 50 mm rod, but for strokes over 300 mm, always evaluate side loads and consider an external guide.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this cylinder delivers 24544 N of push force and 23562 N of pull force. The maximum push force at 0.9 MPa is 44178 N. The push force is greater than the pull force due to the area of the 50 mm piston rod.
Yes, if you need the ability to fine-tune the stroke end. The SCJ250X175-40S is a direct dimensional replacement for an SC250X175 with a magnet, but the body length A is 409 mm. You must match the 250 mm bore, PT 1 inch ports, and ensure the 40 mm adjustment range covers your stroke reduction requirement.
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