Airtac SCJ250 Standard Cylinder SCJ250X800-100
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X800-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø250mm bore, 800mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke800 mm
- Stroke adjust-100 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X800-100
The SCJ250X800-100 is a double-acting, single-rod pneumatic cylinder that puts field-adjustable stroke control directly into the rear cap. With a 250 mm bore and an 800 mm nominal stroke, it delivers a substantial 24544 N of push force at just 0.5 MPa, making it a workhorse for heavy industrial actuation. The integrated adjusting screw provides up to 100 mm of stroke-end reduction, letting you dial in the exact stopping position without removing the cylinder or adding external hard stops.
This model uses a 50 mm diameter piston rod and a PT1 port, with an ISO 6430 class tie-rod construction that includes an adjustable air cushion to decelerate high-inertia loads. The body length A(SCJ) is 409 mm, and the cushion length is 40 mm. It operates on filtered air from 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa, and is built for a standard temperature range of -20 to +70 °C.
Airtac SCJ250 Standard Cylinder SCJ250X800-100 Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X800-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 800 mm |
| Stroke adjustment | Up to 100 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 SCJ250X800-100
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×800 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ250X800-100 Is Used
Heavy Press & Forming
Adjust the stroke end on a large forming press to accommodate different material thicknesses or tooling setups, using the 100mm range for precise shut-height control.
Material Handling & Stops
Fine-tune the stopping position of a heavy-duty conveyor gate or pallet stop, allowing operators to compensate for wear on contact surfaces without replacing parts.
Commissioning Large Machinery
During machine commissioning, dial in the exact actuator travel for a 250mm bore cylinder moving a large structural component, eliminating the need to machine custom spacer blocks.
Is the Airtac SCJ250 Standard Cylinder SCJ250X800-100 the Right Cylinder?
Choose this cylinder when you need massive force and the ability to fine-tune the stroke end on a large machine. If your application requires even more force, this is the largest bore in the SCJ family, so consider a guided cylinder or a tandem arrangement if you need to exceed its 44178 N push at 0.9 MPa. For a fixed-stroke alternative with the same force profile, the SC250X800 is the direct counterpart. A replacement must match the 250 mm bore, 800 mm nominal stroke, 100 mm adjust range, PT1 port thread, and basic mounting. For strokes of 800 mm, always evaluate the rod's side-load capacity; an external guide rail or a self-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 (-100)
- ✓ 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 SCJ250X800-100 FAQ
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 5006 kgf. The pull force is lower because the rod reduces the effective piston area on the return stroke.
Yes, if you need the adjustable stroke feature. The SCJ250X800-100 is dimensionally compatible with the SC250X800 fixed-stroke cylinder but has a longer body to house the adjusting screw. Ensure your machine has clearance for the rear adjustment mechanism and that the port, mounting, and magnet options match your existing setup.
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