Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 180mm 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
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75S
The AirTAC SAIJ125X180-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 180mm nominal stroke that can be fine-tuned down by up to 75mm, creating a usable travel window of 105-180mm. This built-in adjustability allows operators to dial in exact retract end positions during commissioning without swapping out the cylinder or fabricating external stopper blocks.
This model includes a magnetic piston (-S) for position sensing and uses a standard carbon steel rod with an M27x2 thread. It operates at speeds of 30-500mm/s and features variable air cushions at both ends to manage kinetic energy. The rear screw acts purely as a travel stop for position tuning, not as a locking device, so load holding without live air requires a separate SAIL or BSAI variant.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 180 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 SAIJ125X180-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×180 | 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 SAIJ125X180-75S Is Used
Variable Product Changeover
Ideal for packaging lines that process different carton sizes, using the 75mm rear adjuster to quickly shift the retract end position without changing hardware.
Heavy Fixture Alignment
Provides 6136N of thrust at 0.5 MPa for clamping heavy metal castings, allowing operators to fine-tune the 105-180mm travel window during initial machine commissioning.
Adjustable Ejector Stops
Used in automated ejection stations where the exact ejection distance must be dialed in on-site, utilizing the PT ported cylinder's built-in stopper screw instead of external jigs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-75S the Right Cylinder?
Choose this 125mm bore cylinder when an application requires heavy thrust (6136N push at 0.5 MPa) alongside flexible end-position tuning. If your setup needs less force, stepping down to a 100mm bore yields 3927N push force, while moving up to a 160mm bore provides 10053N. The wide 75mm adjustment window is perfect for machinery that frequently processes varying product sizes, replacing the need for fixed-stroke SAI cylinders when exact travel distances might shift. To match this ISO 15552 footprint, confirm the 180mm stroke, 75mm adjuster, PT tapered port threads, and the -S magnet for CMSE or DMSE sensors.
Because the 180mm stroke is relatively short for this large bore, side-load risks are minimal, but the M27x2 rod thread and robust carbon steel piston rod still require proper alignment to prevent premature seal wear. Remember that the rear adjuster only sets the travel limit; it cannot hold a load pneumatically, so external rod locks are necessary for fail-safe holding.
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 SAIJ125X180-75S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the 180mm nominal stroke by up to 75mm, providing an effective travel range of 105-180mm. This stopper only sets the end position and does not lock the load pneumatically.
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