The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø250mm bore, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-75S is a heavy-duty double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, delivering a substantial 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 75 mm of fine-tuning on the stroke end, making it ideal for large-scale industrial machinery where the final position must be precisely dialed in during commissioning or after tooling changes.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod and a PT1 inch port, with an adjustable air cushion for effective end-of-stroke deceleration. The built-in magnet (suffix -S) allows for direct mounting of CMSG/DMSG/EMSG sensors along the barrel for reliable, non-contact position feedback. Its body length A(SCJ) is 409 mm, providing a robust platform for high-force applications.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 75 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. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -75 | 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.
Fine-tune the final pressing depth or clamping position on large hydraulic-style pneumatic presses by adjusting the rear screw, accommodating variations in material thickness or tooling without reprogramming.
Calibrate the stroke end of a high-torque valve actuator in water treatment or petrochemical lines, using the 75 mm adjustment range to perfectly set the open or closed position of a large ball or butterfly valve.
Maintain consistent belt tension on a heavy-duty mining conveyor. The adjustable stroke allows for easy take-up of belt stretch over time, and the magnet sensor confirms the tensioner's position with the central control system.
Choose the SCJ250 when your application demands the highest force in the SCJ family, with a push force of 24544 N at 0.5 MPa. If your force requirements are lower, stepping down to the SCJ200 bore provides 15708 N of push force at the same pressure. For applications needing a fixed, non-adjustable stroke, the standard SC series is a more economical choice.
This cylinder is a direct replacement for another AirTAC SCJ250 adjustable-stroke cylinder with the same 350 mm nominal stroke and 75 mm adjustment range. Ensure the replacement matches the PT port thread, basic mounting, and the -S magnet option for sensor compatibility. For this 350 mm stroke length, be mindful of side loads on the 50 mm rod; an external guide rail or a guided cylinder is recommended if the load is not perfectly axial.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. Since it is a single-rod cylinder, the push force is greater than the pull force. The maximum push force at 0.9 MPa is 44178 N.
You must match the adjustment range for a direct functional replacement. The -75 in the code specifies a 75 mm adjustable stroke range. A model with a different range, like -50 or -100, will not provide the same field-adjustable end-position control. Always match the full SCJ250X350-75 code for an exact replacement.
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