Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-10S 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 SAIJ125AX120-10S
The AirTAC SAIJ125X120-10-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 110-120 mm usable travel window, allowing you to dial back the 120 mm nominal stroke by up to 10 mm during commissioning. Belonging to the 125 mm bore class, it generates 6133 N of thrust at 0.5 MPa and 8590 N at 0.7 MPa, making it suited for heavy-duty positioning tasks.
This variant includes a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and ships with a magnet (-S) for position sensing. You can mount AirTAC CMSE reed or DMSE solid-state switches directly into the sensor grooves machined on both sides of the extruded aluminum barrel. The rear adjuster acts purely as a mechanical stop to set the retract end-point, so you must maintain live air pressure to hold a load in place.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-10S |
|---|---|
| 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 SAIJ125AX120-10S
| 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 SAIJ125AX120-10S Is Used
Product Changeover
Dial in the exact 110-120 mm retract position when switching product sizes on a heavy-duty conveyor line, avoiding physical cylinder swaps.
Heavy Pressing
Leverage the 6136 N push force at 0.5 MPa to seat large components, using the 10 mm adjuster to fine-tune the final contact position.
Machine Setup
Use the rear stopper to set precise end-of-travel limits during initial machine commissioning, ensuring repeatable heavy-load positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-10S the Right Cylinder?
Select this 125 mm bore model when your application requires substantial force—stepping down to a 100 mm bore drops the output to 3927 N at 0.5 MPa, while moving up to a 160 mm bore yields 10053 N. An adjustable stroke is highly beneficial for machine setups requiring fine end-position tuning without adding external stops or physically swapping cylinders during a product-size changeover.
For replacement or new builds, verify the 120 mm nominal stroke, 10 mm adjustment range, PT tapered port threads, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets, deliberately omitting FB, CA, CB, and CR styles. Because the 120 mm stroke is under 300 mm, side-load stress is moderate, but the 32 mm rod diameter still handles lateral forces better than smaller bores. Note that neither the rear adjuster nor the air cushions function as a lock; for fail-safe load holding without live air, specify an external rod lock or choose the SAIL or BSAI 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 SAIJ125AX120-10S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 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 is a mechanical stop that allows you to shorten the 120 mm nominal stroke by up to 10 mm, creating a 110-120 mm usable travel window for fine-tuning end positions without changing the cylinder.
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