The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X200-75S 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, 200mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X200-75S is a large-bore double-acting single-rod cylinder with a rear adjusting screw that lets you fine-tune the stroke end position by up to 75 mm on the machine. With a 250 mm bore and a nominal 200 mm stroke, it delivers 24544 N of push force at 0.5 MPa, rising to 44178 N at the maximum operating pressure of 0.9 MPa—enough for heavy pressing, clamping, and forming tools where the final stop position must be dialed in precisely during commissioning or after tooling wear.
This model includes a built-in magnet (-S suffix), so you can mount CMSG, DMSG, or EMSG reed or solid-state sensors directly on the tie-rod barrel for non-contact end-of-stroke or mid-stroke sensing. The 50 mm piston rod, M42x2 rod thread, and PT 1-inch ports handle high flow rates, while the 40 mm adjustable air cushion decelerates the piston smoothly. The ISO 6430 class body length A(SCJ) is 409 mm, making it a direct dimensional match when replacing an existing AirTAC SCJ250 adjustable-stroke cylinder of the same configuration.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X200-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 200 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. |
| ×200 | 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.
In heavy hydraulic-style pneumatic presses, the 75 mm adjustable stroke lets operators dial in the exact bottom-dead-centre position after die changes or shim wear, without removing the 250 mm bore cylinder from the machine frame.
On a conveyor for castings or large fabrications, the adjustable end-stop screw sets a precise pusher retract position. The built-in magnet sensor confirms full retraction before the next part enters the station.
For a structural welding fixture, the SCJ250X200-75S clamps large assemblies. The 75 mm adjustment range compensates for different batch tolerances, ensuring consistent clamping force without over-stroking the joint.
Step up to this 250 mm bore when a 200 mm bore cylinder’s 15708 N push at 0.5 MPa is borderline for your load. If the application needs a fixed, non-adjustable stroke, the standard SC250X200 single-rod cylinder is the simpler alternative. For guided or side-loaded moves, pair this cylinder with an external guide rail or switch to a guided cylinder; at 200 mm of stroke, the 50 mm rod is robust, but any off-axis load should be managed to prevent rod bending.
As a direct replacement, match an AirTAC SCJ250X200-75S with the same bore, 200 mm nominal stroke, 75 mm adjust range, PT port thread, basic mounting, and built-in magnet. The SCJ mounting system accepts FA front flange, LB foot, or TC centre trunnion accessories (part codes F-SC250FA, F-SC250LB, F-SC250TC with TCM1 bracket) if you need to change the mounting style later.
Adjustable-stroke checklist
The push force (extending) is 24544 N at 0.5 MPa and 44178 N at the maximum operating pressure of 0.9 MPa. The pull force (retracting) is lower because the 50 mm rod reduces the effective piston area, giving 23562 N at 0.5 MPa. These values match the standard SC single-rod cylinder of the same bore.
Yes, if you need field-adjustable stroke end control. The SCJ250X200-75S shares the same bore, nominal 200 mm stroke, port size, and mounting accessories as the SC250. The body length is slightly longer to house the adjusting screw. Ensure the 75 mm adjustment range does not interfere with your machine envelope, and match the magnet option (-S) and port thread (PT) for a direct swap.
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