Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40S
The AirTAC SAIJ125X250-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 210 to 250 mm. Delivering 6136 N of push force at 0.5 MPa, this large-bore actuator handles demanding operations while allowing you to fine-tune the end position at commissioning without swapping out hardware. The carbon steel rod and M27x2 thread offer robust load transmission for heavy tooling.
This unit includes a magnet for position sensing, working seamlessly with AirTAC CMSE reed switches and DMSE solid-state sensors housed in the dual-side sensor grooves. Fluid ports feature a PT tapered thread, and the extruded aluminum barrel integrates adjustable air cushions at both ends to manage deceleration. The rear stopper acts purely as a travel limit, not a load lock, so live air pressure must be maintained to hold a load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40S Is Used
Product Changeover Dials
Quickly adjust the 210-250 mm travel window during packaging line format changes to accommodate different carton sizes without changing the cylinder.
Heavy Pressing Operations
Leverage 6136 N of thrust at 0.5 MPa for heavy pressing tasks while using the rear stopper to precisely set the final mechanical end position.
Machine Setup Tuning
Fine-tune the retract end-position during initial commissioning to dial in exact stopping points without fabricating external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40S the Right Cylinder?
Select this 125 mm bore actuator when a 63 mm bore (1559 N at 0.5 MPa) lacks the thrust for heavy moving assemblies, but stepping up to a 160 mm bore (10053 N) would be excessive overkill. The 40 mm rear adjustment screw is chosen over a fixed-stroke SAI when a production line requires variable end-stops for rapid product-size changeovers, letting operators dial in the exact travel limit on the fly.
Because the nominal stroke is 250 mm, the M27x2 piston rod and carbon steel shaft can handle substantial loads, though long unsupported strokes still call for an external guide to prevent side-load damage. For dimensionally interchangeable ISO 15552 replacements, match the 125 mm bore, 250 mm stroke, PT ports, and the -S magnet requirement. The mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. If true load-holding without live air is needed, look to the SAIL or BSAI series instead.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40S FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa the push force increases to 8590 N.
The rear adjuster screw allows you to shorten the effective travel by up to 40 mm from the 250 mm nominal stroke, yielding a usable window of 210 to 250 mm. It functions as a mechanical stop and does not lock the load without live air.
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