Airtac SCJ250 Standard Cylinder SCJ250X1000-40S
The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X1000-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø250mm bore, 1000mm nominal stroke, PT1" ports and adjustable end cushioning.
- BoreØ250 mm
- Nominal stroke1000 mm
- Stroke adjust-40 mm
- Port sizePT1"
- Rod threadM42×2
- CushionAdjustable, 40 mm
About the Airtac SCJ250 Standard Cylinder SCJ250X1000-40S
The SCJ250X1000-40S is a large-bore, double-acting single-rod pneumatic cylinder engineered for applications where a long stroke and massive force must be combined with field-adjustable end-position tuning. With a 250 mm bore and a nominal 1000 mm stroke, it delivers a substantial 24544 N of push force at just 0.5 MPa, while the integrated 40 mm rear adjusting screw lets operators fine-tune the stroke end to accommodate wear, tooling changes, or process optimization without dismounting the cylinder.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod and a 1-inch PT port for high flow. The built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors along the barrel for reliable, non-contact end-of-stroke detection. Its 40 mm adjustable cushion decelerates heavy loads smoothly at the end of travel, protecting the machine structure.
Airtac SCJ250 Standard Cylinder SCJ250X1000-40S Technical Specifications
| Model | Airtac SCJ250 Standard Cylinder SCJ250X1000-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 1000 mm |
| Stroke adjustment | Up to 40 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 SCJ250X1000-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 250 | Bore size in mm. |
| ×1000 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ250X1000-40S Is Used
Heavy Press End-Stop Adjustment
Fine-tune the final pressing depth on large hydraulic-pneumatic forming presses by adjusting the rear screw, compensating for tooling wear or material thickness variations without reprogramming the press controls.
Long-Stroke Material Transfer
Dial in the exact stopping position for a 1000 mm transfer shuttle on a heavy-duty conveyor line. The 40 mm adjustment range simplifies commissioning and allows for quick format changes between product sizes.
Sawmill Log Fence Positioning
Use the adjustable stroke to set the end-stop for a log fence on a large bandsaw. The 24544 N push force easily positions heavy timber, and the stroke can be tweaked to account for blade kerf changes.
Is the Airtac SCJ250 Standard Cylinder SCJ250X1000-40S the Right Cylinder?
Select the SCJ250X1000-40S when your application demands the highest force in the SCJ family and the ability to fine-tune the stroke end point by up to 40 mm. If the 24544 N push force at 0.5 MPa exceeds your requirement, stepping down to a 200 mm bore reduces the push force to 15708 N, saving energy and physical space. For applications where the stroke length is fixed and never needs adjustment, the standard SC fixed-stroke cylinder is a more economical choice. As a direct replacement, match the 250 mm bore, 1000 mm nominal stroke, 40 mm adjust range, PT port thread, and the -S magnet option. For this 1000 mm stroke length, carefully evaluate side-loading; if the rod is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and ensure long seal life.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ250X1000-40S FAQ
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. The push force is greater because the single piston rod reduces the effective piston area on the return stroke. The maximum theoretical force at 1.0 MPa is 5006 kgf.
The rear-cap adjusting screw shortens the stroke end by up to 40 mm from the nominal 1000 mm maximum. It is a direct dimensional replacement for another AirTAC SCJ250X1000-40S with the same bore, stroke, adjust range, PT port, and -S magnet. It cannot be directly replaced by a fixed-stroke SC cylinder if the adjustable feature is required.
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