Airtac SCJ250 Standard Cylinder SCJ250X150-75S
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X150-75S 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, 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 SCJ250X150-75S
Generating 24544 N of push force at 0.5 MPa, this SCJ250X150-75S adjustable-stroke cylinder brings field-tunable positioning to heavy industrial tasks. The rear-cap screw provides up to 75 mm of stroke-end reduction, letting you dial in the exact stopping point for a 150 mm nominal stroke without swapping the unit. Its 50 mm rod and PT1" ports handle high flow, while the 40 mm air cushion decelerates large inertial loads smoothly.
A built-in magnet is integrated into the piston, so CMSG, DMSG, or EMSG sensors can be clamped directly onto the tie-rod barrel for reliable end-of-stroke or mid-stroke sensing. The ISO 6430 class tie-rod construction and TPU seals suit standard operating temperatures from -20 to +70 °C, making this cylinder a durable, adjustable workhorse for pressing, clamping, and material handling where the final position needs to be refined on the machine.
Airtac SCJ250 Standard Cylinder SCJ250X150-75S Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X150-75S |
|---|---|
| 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 SCJ250X150-75S
| 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 SCJ250X150-75S Is Used
Press-Fit Depth Tuning
Fine-tune the final pressing depth for large bearings or bushings during commissioning, accommodating part tolerance stack-ups without reprogramming the press.
Heavy Part Stop Adjustment
Set a precise, hard end-stop for heavy pallets or castings on a conveyor line, using the 75 mm screw range to adapt to different product lengths quickly.
Wear Compensation in Clamping
Compensate for gradual wear on clamping dies or tooling surfaces over long production runs by simply advancing the rear adjusting screw to restore full clamping force.
Is the Airtac SCJ250 Standard Cylinder SCJ250X150-75S the Right Cylinder?
Choose this 250 mm bore when your application demands around 24.5 kN of push force at standard plant air. If you can accept a lower force, stepping down to the 200 mm bore reduces push force to roughly 15.7 kN at the same pressure, saving space and air consumption. For applications where the stroke length is fixed and will never need field adjustment, the standard SC fixed-stroke cylinder is a simpler, slightly shorter alternative. A direct replacement must match the 250 mm bore, 150 mm nominal stroke, 75 mm adjustment range, PT port thread, and the built-in magnet. The basic mounting style means you will need to provide your own mounting brackets or use the tie-rod extensions for fixture attachment.
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 SCJ250X150-75S FAQ
At 0.5 MPa, it delivers 24544 N of push force and 23562 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5006 kgf.
No. The rear adjusting screw only sets the stroke end position and the air cushion only decelerates the piston. Neither feature will hold the load if air pressure is lost or the valve is centered. For load holding without live pressure, you must add an external rod brake or a pilot-operated check valve.
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