Airtac SCJ250 Standard Cylinder SCJ250X1000-50S
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X1000-50S 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, 1000mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke1000 mm
- Stroke adjust-50 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X1000-50S
The SCJ250X1000-50S is a double-acting, single-rod pneumatic cylinder from AirTAC, engineered for heavy-duty applications requiring precise, field-adjustable stroke end positioning. With a 250 mm bore and a nominal 1000 mm stroke, the integrated rear adjusting screw provides a 50 mm range to fine-tune the retracted end position, delivering a substantial push force of 24544 N at 0.5 MPa. The 50 mm diameter piston rod and PT1 inch ports ensure robust air flow for consistent, powerful linear motion.
This tie-rod cylinder features an adjustable pneumatic cushion to decelerate the piston smoothly at the end of its travel, protecting the end cap and reducing noise. The built-in magnet (denoted by the 'S' suffix) allows for direct mounting of CMSG/DMSG/EMSG sensors on the barrel for contactless position feedback. With a body length A(SCJ) of 409 mm, this ISO 6430 class cylinder is a reliable workhorse for demanding industrial tasks.
Airtac SCJ250 Standard Cylinder SCJ250X1000-50S Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X1000-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 1000 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.
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 SCJ250X1000-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×1000 | 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.
Where the Airtac SCJ250 Standard Cylinder SCJ250X1000-50S Is Used
Heavy Press End-Stop Adjustment
Fine-tune the final pressing depth on a large hydraulic-style pneumatic press by adjusting the SCJ's stroke end screw, ensuring consistent part compression without reprogramming the machine controller.
Palletizer Layer Positioning
Adjust the retracted position of a high-capacity palletizer's pusher arm to accommodate different pallet sizes or layer heights, using the 50 mm screw range for quick format changeovers.
Foundry Mould Clamp Take-Up
Compensate for wear on large sand mould flasks by incrementally adjusting the clamping cylinder's stroke end, maintaining a perfect seal and preventing flash without replacing the actuator.
Is the Airtac SCJ250 Standard Cylinder SCJ250X1000-50S the Right Cylinder?
Select the SCJ250X1000-50S when your application demands a high-force actuator with the flexibility to adjust the stroke end point by up to 50 mm during setup or changeovers. If your force requirements are lower, consider stepping down to the 200 mm bore model, which provides a 15708 N push force at 0.5 MPa. For applications where the stroke is fixed and never needs adjustment, the standard SC250X1000-S cylinder offers a more economical, non-adjustable alternative. A direct replacement must match the 250 mm bore, 1000 mm nominal stroke, 50 mm adjust range, PT port thread, and the built-in magnet. For this 1000 mm stroke length, carefully evaluate side-loading; an external guide rail or a guided cylinder is recommended to prevent rod bending and ensure long seal life.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ250X1000-50S FAQ
At the standard operating pressure of 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. The push force is higher because the rod reduces the effective piston area on the pull side.
The rear adjusting screw limits the retraction stroke, allowing you to shorten the stroke end by up to 50 mm from the 1000 mm nominal maximum. It is a direct dimensional replacement for an SCJ250X1000-50S of the same configuration. If you are replacing a fixed-stroke SC250X1000-S, the SCJ will fit but adds the adjustment feature, making the body slightly longer.
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