Airtac SCJ250 Standard Cylinder SCJ250X1000-75
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X1000-75 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, 1000mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke1000 mm
- Stroke adjust-75 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X1000-75
The SCJ250X1000-75 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke series, delivering a substantial 24544 N of push force at 0.5 MPa. Its key differentiator is the rear-cap adjusting screw, which provides up to 75 mm of field-adjustable stroke-end reduction, allowing precise mechanical tuning of the piston's stop position without altering the cylinder's 1000 mm nominal maximum stroke.
Built on a robust tie-rod construction with a 50 mm diameter piston rod and a 1-inch PT port, this ISO 6430 class cylinder includes an adjustable air cushion (40 mm length) for smooth deceleration of high-inertia loads. The body length A(SCJ) is 409 mm, and the operating pressure range is 0.15 to 1.0 MPa, making it a powerful solution for heavy-duty industrial tasks requiring on-machine stroke fine-tuning.
Airtac SCJ250 Standard Cylinder SCJ250X1000-75 Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X1000-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 1000 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.
Theoretical Output Force (Ø250mm)
| 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.
Model Code: Airtac SCJ250 Standard Cylinder SCJ250X1000-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×1000 | 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.
Where the Airtac SCJ250 Standard Cylinder SCJ250X1000-75 Is Used
Heavy-Duty Press End-Stop Adjustment
In large forming or laminating presses, the 75 mm adjustment range allows operators to quickly dial in the final platen position to compensate for variations in material thickness or tooling wear, ensuring consistent pressure application without reprogramming the machine.
Material Handling Gate Positioning
For diverting heavy pallets or bulk materials on wide conveyors, the SCJ250X1000-75 can act as a powerful gate actuator. The adjustable stroke allows the gate opening to be precisely matched to different product sizes, preventing jams and optimizing flow control.
Large-Scale Jig & Fixture Clamping
In welding or assembly fixtures for large structures, this cylinder provides the high clamping force needed. The adjustable stroke enables the clamp arm's travel to be fine-tuned for different assembly variants, reducing setup time between production runs.
Is the Airtac SCJ250 Standard Cylinder SCJ250X1000-75 the Right Cylinder?
Choose the SCJ250X1000-75 when your application demands high force and the ability to fine-tune the stroke end position by up to 75 mm during commissioning or changeovers. If a slightly lower force is acceptable, stepping down to a 200 mm bore SCJ reduces the push force to 15708 N at 0.5 MPa. For applications where the stroke never needs adjustment, the fixed-stroke SC250X1000 is a simpler, more cost-effective alternative.
For this 1000 mm stroke length, rod buckling and side-loading are critical considerations. Ensure the load is guided externally and aligned axially with the rod to prevent bending and premature seal wear. A direct replacement must match the 250 mm bore, 1000 mm nominal stroke, 75 mm adjust range, PT port thread, and basic mounting configuration. If position sensing is required, select the -S magnet option to use CMSG/DMSG sensors.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ250 Standard Cylinder SCJ250X1000-75 FAQ
The output force depends on the operating pressure. At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 5006 kgf. The pull force is lower because the 50 mm piston rod reduces the effective area on the return stroke.
A rear-cap adjusting screw lets you shorten the stroke end by up to 75 mm from the 1000 mm nominal maximum. By turning the screw, you physically limit the piston's retraction, providing a repeatable mechanical end-stop. This can often eliminate the need for a separate external hard stop for the retract stroke, simplifying the machine design and allowing quick, tool-free adjustments.
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