Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20S
The AirTAC SAIJ125X75-20-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 75mm nominal stroke that can be dialed back by up to 20mm, creating a precise 55-75mm usable travel window for commissioning flexibility. The extruded aluminum barrel includes sensor grooves on both sides, and this -S variant carries a magnet for direct switching via CMSE reed or DMSE electronic sensors.
This adjustable design eliminates the need to swap cylinders or bolt on external stops when fine-tuning the retract end position. The 32mm carbon steel rod and M27x2 thread provide a sturdy interface, while the PT tapered port ensures a tight pneumatic connection. The rear adjuster acts strictly as a travel stop for deceleration alongside the variable air cushions, not as a load-holding brake.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125X75-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SAIJ125X75-20S Is Used
Machine Changeover
Dial in the 55-75mm retract end-stop during product size changes on a packaging line without swapping out the entire cylinder assembly.
End-Position Tuning
Fine-tune the exact retraction point at commissioning to perfect a heavy pressing operation, using the rear screw rather than adding external spacers.
Adjustable Forming Stop
Set a precise material forming depth using the 6136N thrust, adjusting the travel window on the fly to accommodate different workpiece thicknesses.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20S the Right Cylinder?
Select this 125mm bore model when an application requires heavy thrust (6136N at 0.5 MPa) but demands variable end-position tuning at setup or during product changeover. If your force requirements are lower, stepping down to an 80mm bore yields 2513N push force, whereas moving up to a 160mm bore provides 10053N. The adjustable 55-75mm window allows you to dial in the exact retract distance without changing the cylinder. Because the stroke is 75mm, external side-load guides are less critical here than on longer travels, though the 32mm rod handles typical loads well.
For ISO 15552 dimensionally interchangeable replacements, match the 125mm bore, 75mm stroke, PT port thread, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Remember that a plain SAIJ does not hold its position without live air pressure; for true load-holding, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder 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 SAIJ125X75-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push thrust and 5734N of pull thrust. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure.
The rear adjuster acts as a mechanical stop that lets you shorten the 75mm nominal stroke by up to 20mm, creating a usable 55-75mm travel window. It sets the end position and works with the air cushions for deceleration, but it does not lock the load without live air pressure.
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