Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-75
The AirTAC SAIJ125X150-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 75 to 150 mm, enabling precise end-position tuning at commissioning without swapping out the unit or adding external mechanical stops. Equipped with a 32 mm SUS420J2 stainless steel rod and PT tapered port threads, it delivers 6136 N of push force at 0.5 MPa.
This adjustable-stroke design allows operators to dial in the retract end position on the fly during machine setup or product changeovers. The rear adjuster acts purely as a travel stop to set deceleration limits, meaning it will not hold a load without live air pressure. For position-holding requirements without continuous pressure, consider the SAIL or BSAI variants instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125AX150-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SAIJ125AX150-75 Is Used
Machine Changeover
Dial in the 75 to 150 mm travel window on the fly when switching product sizes on a packaging line, eliminating the need to physically swap cylinders or bolt on external stops.
End-Position Tuning
Fine-tune the retract stroke during initial commissioning to perfect a pressing or clamping operation, using the rear screw to dial out mechanical inconsistencies.
Variable Assembly Stops
Adjust the end-stop position for different part heights on an assembly conveyor, relying on the 6136 N of thrust at 0.5 MPa to drive heavy tooling reliably.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-75 the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires substantial thrust, such as the 6136 N push force at 0.5 MPa, combined with a highly variable end-stop. If you need less force, stepping down to an 80 mm bore yields 2513 N, whereas upgrading to a 160 mm bore provides 10053 N. The SAIJ125X150-75 is selected over a fixed SAI model specifically when the 75 to 150 mm travel window must be fine-tuned during machine commissioning or product size changeovers.
As an ISO 15552 profile cylinder, it is dimensionally interchangeable with standard ISO 15552 mounting interfaces. It supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Since this configuration lacks a magnet (-S), it cannot host CMSE reed or DMSE electronic sensors; if position feedback is needed, specify an -S model. Note that the rear adjuster is a stop, not a lock, so external holding mechanisms are required if gravity loads must be prevented from drifting when air pressure is removed.
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 SAIJ125AX150-75 FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke from 150 mm down to as little as 75 mm. It sets the travel end and deceleration point but does not lock or hold the load without live air pressure.
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf of push force.
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