Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 175mm 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
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20S
The AirTAC SAIJ125X175-20-S is a double-acting, single-rod profile cylinder built to ISO 15552 dimensional standards. It features an extruded aluminum barrel with sensor grooves on both sides, and includes a magnetic piston for position detection. A rear-mounted adjustment screw allows you to trim the effective stroke by up to 20 mm, creating a precise 155-175 mm usable travel window for fine-tuning end positions at commissioning.
Delivering 6136 N of push force and 5734 N of pull force at 0.5 MPa, this 125 mm bore cylinder handles heavy loads with ease. The PT tapered port threads ensure a tight pneumatic seal, while the 32 mm carbon steel rod and M27x2 thread provide robust resistance to side loads. The rear adjuster acts purely as a travel stop to set deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAIJ125X175-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SAIJ125X175-20S Is Used
Press Tonnage Setup
Dial in the exact 155-175 mm travel window during initial press commissioning to accommodate varying material thicknesses without changing tooling.
Product Changeover
Quickly adjust the rear stopper on the assembly line when switching between different product sizes, saving downtime compared to replacing fixed-stroke actuators.
Heavy Material Handling
Leverage the 6136 N push force to move heavy pallets or components, using the fine-tune adjustment to set precise resting positions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20S the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires variable end stops or frequent product-size changeovers without physically swapping cylinders or adding external stops. If your application needs less force, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa, which may improve cycle times and reduce air consumption. For load-holding requirements without continuous air pressure, this cylinder is insufficient; consider the SAIL series with an air-released lock or an external pilot-operated check valve instead.
To match this ISO 15552 replacement exactly, verify the 125 mm bore, 175 mm nominal stroke, 20 mm adjustment range, PT port threads, and the -S magnet option for CMSE reed or DMSE electronic sensors. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the 175 mm stroke is relatively short for this large bore, side-load stress is minimal, but external guides are still recommended for heavy offset loads.
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 SAIJ125X175-20S 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 the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
A rear external screw acts as a mechanical stop, allowing you to shorten the 175 mm nominal stroke by up to 20 mm, resulting in a usable travel window of 155 to 175 mm. This adjuster only sets the end position and does not lock the load without live air pressure.
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