Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-40S
The AirTAC SAIJ125X115-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a built-in magnet for position sensing. The carbon steel rod and extruded aluminum barrel ensure durability in heavy-duty operations.
With a nominal stroke of 115mm and a 40mm adjustment code, this model provides a usable travel window of 75-115mm. You can fine-tune the retract end-position at commissioning without external stops. The PT tapered port and G1/2 thread size match the 125mm bore specifications, while the dual-side sensor grooves support precise electronic or reed switch mounting.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAIJ125X115-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SAIJ125X115-40S Is Used
Machine Changeover
Dial in the 75-115mm travel window during product size changes to set new retract positions quickly without mechanical modifications.
End-Position Tuning
Fine-tune the stroke end at commissioning to absorb mechanical tolerances and achieve precise positioning of heavy 6136N loads.
Variable End Stops
Use the rear adjusting screw to set custom stroke limits on automated lines, adapting the cylinder motion to specific process needs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-40S the Right Cylinder?
Choose this 125mm bore cylinder when you need 6136N of thrust at 0.5 MPa and require variable end-stops for product changeovers. If your application needs less force, stepping down to a 100mm bore yields 3927N; stepping up to a 160mm bore provides 10053N. The adjustable stroke is ideal for tuning machinery setups without swapping cylinders, unlike a fixed-stroke SAI model.
This SAIJ125X115-40-S includes a magnet (-S) for CMSE reed and DMSE electronic sensors. It supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2. Remember that the rear adjuster is a travel stop, not a lock; for load-holding without live air, consider an external rod lock or the SAIL series.
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 SAIJ125X115-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster allows you to shorten the 115mm nominal stroke by up to 40mm, creating a usable travel window of 75-115mm. This stopper fine-tunes the end position but does not lock the load without live air pressure.
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