Airtac SCJ250 Standard Cylinder SCJ250X1000-75S
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X1000-75S 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, 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 SCJ250X1000-75S
The SCJ250X1000-75 is a large-bore, double-acting single-rod cylinder delivering 24544 N of push force at 0.5 MPa, making it a powerhouse for heavy industrial actuation. Its defining feature is a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke-end reduction, allowing engineers to fine-tune the 1000 mm nominal stroke for precise end-positioning without swapping the cylinder.
This model features a 50 mm diameter piston rod and a PT1" port, with an adjustable air cushion length of 40 mm to smoothly decelerate high-inertia loads. The body length A(SCJ) is 409 mm, and it is built on a robust tie-rod platform conforming to the ISO 6430 class for dimensional consistency in heavy-duty applications.
Airtac SCJ250 Standard Cylinder SCJ250X1000-75S Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X1000-75S |
|---|---|
| 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 SCJ250X1000-75S
| 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 SCJ250X1000-75S Is Used
Heavy Press End-Stop Tuning
The 75 mm adjustment range lets operators precisely set the final pressing depth on large assembly or forming presses, compensating for tooling wear or material thickness variations without mechanical stop changes.
Material Handling Kick-off
In large-scale material handling, the adjustable stroke can be fine-tuned to perfectly synchronize the kick-off point for heavy pallets or slabs, ensuring reliable transfer onto a conveyor line.
Sawmill or Veneer Line Setup
For log or veneer positioning in a sawmill, the field-adjustable stroke allows rapid changeover between different cutting patterns, setting the precise stop position for the carriage feed without lengthy mechanical adjustments.
Is the Airtac SCJ250 Standard Cylinder SCJ250X1000-75S the Right Cylinder?
Select the SCJ250 when your application demands substantial force and the ability to dial in the stroke end point during commissioning or format changes. If your force requirement is lower, stepping down to the 200 mm bore SCJ200 reduces the push force to 15708 N at 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC250 is a more economical choice.
For this 1000 mm stroke length, carefully manage side loads to prevent rod bending. An external guide rail or a switch to a guided cylinder is strongly recommended if the load is not perfectly axial. As a direct replacement, match this model to another AirTAC SCJ250X1000-75 with a PT port, basic mounting, and a built-in magnet.
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 SCJ250X1000-75S FAQ
A rear-cap screw allows you to shorten the stroke end position by up to 75 mm from the nominal 1000 mm maximum. This is a mechanical end-stop adjustment for the piston's extension, not a force or speed control. The cylinder's push force remains 24544 N at 0.5 MPa regardless of the stroke setting.
No. As a standard double-acting cylinder, the SCJ250X1000-75 will not hold its position if air pressure is lost or the valve is centered. The piston can drift or drop under load. For load-holding without live pressure, you must add a pilot-operated check valve or an external mechanical rod lock.
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