Airtac SCJ250 Standard Cylinder SCJ250X150-75
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X150-75 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, 150mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke150 mm
- Stroke adjust-75 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X150-75
The SCJ250X150-75 is a double-acting, single-rod pneumatic cylinder engineered for heavy-duty applications requiring on-machine stroke fine-tuning. Its rear-cap adjusting screw provides up to 75 mm of stroke-end reduction from the 150 mm nominal maximum, allowing commissioning engineers to dial in the precise stop position without swapping the cylinder or adding external hard stops. With a 50 mm diameter piston rod and PT1 port, this ISO 6430 class cylinder delivers a substantial 24544 N of push force at 0.5 MPa.
Built on a robust tie-rod construction, the SCJ250X150-75 features an adjustable air cushion to decelerate high-inertia loads smoothly. The body length A(SCJ) is 409 mm, and the operating speed range is 30-500 mm/s, suitable for large-scale automation tasks. At the maximum operating pressure of 0.9 MPa, the theoretical push force reaches 44178 N, providing a significant power reserve for pressing, clamping, and forming operations.
Airtac SCJ250 Standard Cylinder SCJ250X150-75 Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X150-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 150 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 SCJ250X150-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×150 | 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 SCJ250X150-75 Is Used
Heavy Press & Clamping
Fine-tune the final pressing depth or clamping position on large assembly fixtures. The 75 mm adjustment range allows for quick changeovers between product variants without mechanical rework.
Material Handling Stops
Act as an adjustable end-stop for pallets or heavy components on a conveyor line. The stroke can be dialed in to accommodate different part sizes, with 24544 N of force to hold the position.
Forming & Bending Machines
Control the stroke end on a metal forming or bending brake. The adjustable screw allows operators to compensate for tooling wear or material spring-back, ensuring consistent bend angles.
Is the Airtac SCJ250 Standard Cylinder SCJ250X150-75 the Right Cylinder?
Choose the SCJ250X150-75 when your application demands the highest force class in the SCJ range and requires field-adjustable stroke end positioning. If your force requirements are lower, stepping down to a 200 mm bore reduces the push force to 15708 N at 0.5 MPa, which may offer a more compact and cost-effective solution. For fixed-stroke applications where no adjustment is needed, the standard SC250X150 cylinder is a direct alternative with identical mounting and force characteristics.
For a direct replacement, match the 250 mm bore, 150 mm nominal stroke, and the 75 mm adjustable range. Ensure the port thread is PT, the mounting style is basic, and there is no magnet option. With a 150 mm stroke, rod bending from side loading is a critical consideration; use an external guide rail or switch to a guided cylinder if the load is not perfectly aligned with the rod axis.
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 SCJ250X150-75 FAQ
At 0.5 MPa, the cylinder produces 24544 N of push force and 23562 N of pull force. The maximum theoretical push force at 1.0 MPa is 5006 kgf. The adjustable stroke screw does not alter the cylinder's force output.
Yes, if you need the ability to fine-tune the stroke end. The SCJ250X150-75 matches the SC250's bore, mounting, and force but adds a rear adjusting screw. Ensure the 75 mm adjustment range and the 409 mm body length fit your machine envelope.
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