Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40S
The AirTAC SAIJ125X120-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N of push force at 0.5 MPa. It features a carbon steel rod and a built-in magnet (-S) for position sensing. By turning the rear stopper screw, you achieve a usable travel window of 80 to 120 mm, allowing precise end-position tuning without swapping hardware.
This 125 mm bore unit uses PT tapered port threads and operates at speeds between 30 and 500 mm/s. It retains the standard extruded aluminum barrel with sensor grooves on both sides, making it dimensionally interchangeable with ISO 15552 cylinders. The integrated magnet works seamlessly with AirTAC CMSE reed and DMSE electronic sensors for reliable switching.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125X120-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125X120-40S Is Used
Product Changeovers
Dial in the 80 to 120 mm travel window during format changes on packaging lines, avoiding the need to physically swap out cylinders for different carton sizes.
End-Position Tuning
Fine-tune the retract stroke at commissioning to perfectly seat heavy 6136 N loads, using the rear screw to absorb mechanical tolerance variations without external stops.
Machine Setup
Simplify assembly by adjusting the stroke on-site to match tooling dimensions, leveraging the 125 mm bore thrust for heavy-duty clamping or pressing tasks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40S the Right Cylinder?
Select this adjustable model when your setup requires variable end stops or product changeovers, as the 40 mm trim range eliminates the need to bolt on external stops. If your application requires less thrust, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa; stepping up to a 160 mm bore provides 10053 N. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air—use an external rod lock or pilot-operated check valve for load-holding.
When matching this for an ISO 15552 replacement, verify the 125 mm bore, 120 mm stroke, 40 mm adjustment range, PT port threads, and the required -S magnet. Although the 32 mm rod handles high axial loads well, any stroke of 300 mm or more on larger setups requires an external guide to prevent side-loading damage. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X120-40S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear stopper screw allows you to trim the nominal 120 mm stroke back by up to 40 mm, creating an adjustable travel window of 80 to 120 mm. This stopper sets the end position but does not lock the load without continuous air pressure.
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