Airtac SCJ40 Standard Cylinder SCJ40X250-10S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-10S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø40mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke250 mm
- Stroke adjust-10 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X250-10S
The AirTAC SCJ40X250-10S is a double-acting, single-rod pneumatic cylinder that puts field-adjustable stroke control directly into a 40mm bore package. With a nominal 250mm stroke and a 10mm rear-end adjustment range, you can fine-tune the end position without swapping the cylinder or adding external hard stops. The built-in magnet (-S suffix) lets you clamp CMSG/DMSG sensors straight onto the tie-rod barrel for reliable end-of-stroke sensing.
At 0.5 MPa air pressure, this cylinder delivers 628 N of push force and 528 N on the pull stroke, thanks to its 16mm piston rod. The PT1/4 port and 21mm air cushion provide smooth deceleration, while the 185mm body length (dimension A) keeps the footprint compact. It is a genuine AirTAC component, engineered for repeatable performance in industrial automation.
Airtac SCJ40 Standard Cylinder SCJ40X250-10S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-10S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 10 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCJ40 Standard Cylinder SCJ40X250-10S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -10 | 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 SCJ40 Standard Cylinder SCJ40X250-10S Is Used
Commissioning & Setup
The 10mm adjusting screw allows technicians to quickly dial in the exact stroke end position during machine setup, eliminating the need to fabricate shims or reposition external stops.
Format Changeover
On packaging lines, use the SCJ40X250-10S to push products of varying widths. Operators can adjust the stroke end by up to 10mm to accommodate different box sizes without changing the cylinder.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be extended slightly over time to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force.
Is the Airtac SCJ40 Standard Cylinder SCJ40X250-10S the Right Cylinder?
Choose the SCJ40X250-10S when your application needs a 250mm reach with the ability to dial in the final stop position by up to 10mm during commissioning or changeovers. If you need more force, stepping up to the 50mm bore (SCJ50) gives you 982 N of push at the same 0.5 MPa pressure. For a fixed, non-adjustable stroke, the standard SC series is a simpler, cost-effective alternative.
This model is a direct replacement for another AirTAC SCJ40X250-10S cylinder with a PT port and magnet. The 250mm stroke is well within the 1200mm maximum for this bore, but always ensure the rod is guided externally if the load applies significant side force. For applications needing a pivoting mount, consider adding the TC centre trunnion kit.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-10)
- ✓ 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 SCJ40 Standard Cylinder SCJ40X250-10S FAQ
The theoretical force at 0.5 MPa is 628 N on the push stroke and 528 N on the pull stroke. The pull force is lower due to the 16mm piston rod reducing the effective area on the return side.
Yes, this SCJ40X250-10S is a direct dimensional and performance replacement for any AirTAC SCJ40X250-10 cylinder. The -S suffix adds a built-in magnet, which does not change the mounting or port dimensions but enables the use of magnetic sensors.
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