The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X300-75S 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, 300mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X300-75S is a large-bore, double-acting single-rod pneumatic cylinder with a field-adjustable stroke end, providing up to 75 mm of fine-tuning range via the rear-cap screw. With a 250 mm bore and a 50 mm rod, it generates 24544 N of push force at 0.5 MPa, making it a formidable actuator for heavy industrial tooling.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG sensors for piston position feedback without external brackets. The body length A(SCJ) is 409 mm, and the cylinder features a 40 mm air cushion to decelerate high-inertia loads smoothly.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X300-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 300 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. |
| ×300 | 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 bottom dead centre of a hydraulic-style pneumatic press ram during die setup or after tooling wear, adjusting the stroke end by up to 75 mm without disassembling the press.
Adjust the end position of a transfer arm moving large castings or weldments between stations, accommodating slight variations in fixture locations without reprogramming a controller.
Set the precise compaction depth for waste baling or material densification, using the 24544 N push force to compress material to a consistent, adjustable volume.
Select the SCJ250X300-75S when you need a powerful, adjustable end-stop for a 300 mm nominal stroke. If your force requirement is lower, stepping down to a 200 mm bore reduces push force to 15708 N at 0.5 MPa, which may be sufficient and allows a more compact installation. For fixed-stroke applications where no adjustment is needed, the standard SC250X300 is a simpler alternative.
The 300 mm stroke combined with a heavy load requires careful management of side forces. An external guide rail or a guided cylinder should be used to prevent rod bending and premature seal wear. A direct replacement must match the SCJ250 bore, 300 mm stroke, 75 mm adjustment range, PT port thread, and the -S magnet option.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. The pull force is lower because the 50 mm rod reduces the effective piston area on the return stroke.
Yes, the SCJ250X300-75S is a direct dimensional replacement for an SC250X300, provided the extra length of the rear adjusting screw housing is accommodated. You must match the port thread (PT), mounting style, and sensor option (-S for magnet). The adjustment screw lets you shorten the stroke end by up to 75 mm, which the fixed SC cannot do.
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