Airtac SCJ250 Standard Cylinder SCJ250X100-20
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X100-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø250mm bore, 100mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke100 mm
- Stroke adjust-20 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X100-20
The SCJ250X100-20 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end control. Its 250 mm bore generates a substantial 24544 N of push force at 0.5 MPa, making it suitable for heavy-duty industrial positioning tasks where fine-tuning the end stop is critical.
Built on a robust tie-rod platform, this ISO 6430 class cylinder features a 50 mm piston rod, a 1-inch PT port, and an adjustable air cushion for controlled deceleration. The body length A(SCJ) is 409 mm, and the maximum standard stroke for this bore is 1500 mm, offering a wide operational window for large-scale automation.
Airtac SCJ250 Standard Cylinder SCJ250X100-20 Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X100-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 20 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 SCJ250X100-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×100 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ250X100-20 Is Used
Heavy Press End-Stop Tuning
Fine-tune the final pressing depth on a large hydraulic or pneumatic press by adjusting the stroke end by up to 20 mm, accommodating tooling wear or material thickness variations without disassembly.
Material Handling Gate Adjustment
Control the opening of a heavy-duty diverter gate on a conveyor system. The adjustable stroke allows operators to quickly change the gate's travel to handle different pallet or product sizes.
Large-Scale Jig & Fixture Setup
Speed up changeovers on a large welding or assembly jig. The rear adjusting screw enables rapid, repeatable setting of the cylinder's end position for different product variants.
Is the Airtac SCJ250 Standard Cylinder SCJ250X100-20 the Right Cylinder?
Choose the SCJ250 when you need high force and the ability to dial in the stroke end position without replacing the cylinder. If your application requires even more force, the next step up is a larger bore; for a lower force class, the SCJ200 provides 15708 N of push at 0.5 MPa. If the stroke adjustment is not needed, a fixed-stroke SC cylinder of the same bore is a direct alternative.
For replacement, match the exact SCJ250X100-20 model with its 20 mm adjustable range, 1-inch PT port, and basic mounting. For strokes of 300 mm or more, consider an external guide or a guided cylinder to manage side loads and prevent rod bending, especially with the high forces this bore can produce.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ250X100-20 FAQ
At the standard operating pressure of 0.7 MPa, this cylinder delivers 34361 N of push force. The pull force is slightly lower at 23562 N at the same pressure due to the area of the 50 mm piston rod. The maximum theoretical push force at 1.0 MPa is 5006 kgf.
The SCJ has a rear-cap adjusting screw that lets you shorten the stroke end by up to the specified range (20 mm in this model) directly on the machine. A standard SC cylinder has a fixed, non-adjustable stroke. Choose the SCJ when you need to fine-tune the end position during commissioning or for format changes.
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