Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30
The AirTAC SAIJ125X185-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel by up to 30 mm, creating a precise 155-185 mm usable window. Built with an extruded aluminum barrel, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This unit utilizes a SUS420J2 stainless steel rod for enhanced durability against moisture and features PT tapered port threads. The rear stopper screw sets the retract end position during commissioning, but it acts strictly as a travel stop and does not hold the load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125AX185-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125AX185-30 Is Used
Product Changeover
Dial in the 155-185 mm stroke window during format size changes on a packaging line without physically replacing the actuator.
Heavy Positioning
Leverage 6136 N of thrust at 0.5 MPa to move heavy pallets or workpieces, using the rear stopper to fine-tune the final resting coordinate.
Machine Setup
Set exact retract end positions at commissioning using the 30 mm adjustment range, avoiding the need to bolt on external hard stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30 the Right Cylinder?
Selecting this 125 mm bore cylinder provides 6136 N of thrust at 0.5 MPa; if your application requires less force, stepping down to a 100 mm bore yields 3927 N, while a 160 mm bore offers 10053 N for heavier loads. The adjustable 155-185 mm travel window is ideal for product changeovers where exact end-position tuning is required without swapping out the entire actuator.
Because the 185 mm stroke is under the 300 mm threshold, external side-load guides are less critical than on longer strokes, though the robust 32 mm rod and M27x2 thread handle substantial loads. For a dimensionally interchangeable ISO 15552 replacement, match the 125 mm bore, 185 mm nominal stroke, 30 mm adjuster, PT ports, and standard mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that SAIJ omits FB, CA, CB, and CR mounts. If your system needs to hold position without air pressure, use an external rod lock or pilot-operated check valve instead of the rear adjuster.
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 SAIJ125AX185-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 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 screw acts as a mechanical stop that lets you shorten the 185 mm nominal stroke by up to 30 mm, providing a usable travel range of 155-185 mm. It functions as an end-position stop, not a lock, and cannot hold the load without live air pressure.
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