The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X300-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø250mm bore, 300mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X300-50S is a heavy-duty double-acting single-rod cylinder with a field-adjustable stroke end, delivering 24544 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 50 mm of stroke-end retraction, letting you fine-tune the stopping position without replacing the cylinder or adding external hard stops—ideal for commissioning large-scale automation where the exact travel needs to be dialled in under load.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod and PT1" ports, with a 40 mm air cushion to decelerate the massive piston assembly. The built-in magnet (suffix -S) allows CMSG/DMSG/EMSG sensors to clamp directly onto the barrel for reliable end-of-stroke detection, while the TPU seal operates from -20 to +70 °C.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X300-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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 50 mm to set precise compression depth in large forming or laminating presses, accommodating tooling wear or material thickness changes without disassembling the machine.
Fine-tune the opening of a diverter gate on a conveyor for aggregates or grain, using the adjustable stroke to control flow rate by precisely setting the cylinder's extended end position.
Dial in the exact clamping stroke on a structural welding fixture, using the 50 mm adjustment range to compensate for variations in workpiece dimensions and ensure consistent clamping force.
Choose the SCJ250 when your application demands the highest force in the SCJ family—push force jumps from 15708 N on the SCJ200 to 24544 N here at 0.5 MPa. If you need a fixed stroke, the standard SC250 is a simpler alternative, but you lose the ability to tweak the stroke end during setup or format changes. For a nominal stroke of 300 mm, ensure the load is guided externally or use a guided cylinder to prevent side-loading and rod bending on the 50 mm rod.
This model replaces any AirTAC SCJ250 adjustable-stroke cylinder with a 300 mm nominal stroke, 50 mm adjust range, PT ports, basic mounting, and a magnet. Always match the bore, nominal stroke, and adjust range when replacing.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. The maximum operating push force at 0.9 MPa is 44178 N. The pull force is lower because the 50 mm piston rod reduces the effective area on the return stroke.
A screw in the rear cap allows you to shorten the stroke end by up to 50 mm from the nominal 300 mm maximum. It sets the physical stopping point for the piston, so you can fine-tune the travel without changing the cylinder. It does not adjust speed or force.
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