Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 475mm 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
- Stroke475 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20S
The AirTAC SAIJ125X475-20-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 475mm nominal stroke that can be fine-tuned backward by up to 20mm, creating a usable travel window of 455-475mm. This built-in adjustability allows precise end-position tuning during commissioning or product changeovers without swapping the cylinder.
This model includes a magnetic piston (-S) for use with AirTAC CMSE reed and DMSE electronic sensors, which seat cleanly into the sensor grooves machined on both sides of the extruded aluminum barrel. It uses a robust 32mm carbon steel rod with an M27x2 thread, and its mounting options cover the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 475 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 SAIJ125X475-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×475 | 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 SAIJ125X475-20S Is Used
Product Changeover
Dial in the 455-475mm travel window quickly during format size changes on a packaging line without replacing the cylinder.
Machine Setup
Fine-tune the rear stopper during initial commissioning to achieve exact end-of-stroke positioning for heavy 6000N+ loads.
Variable End Stops
Accommodate slight variations in part dimensions on an automated assembly line by adjusting the effective stroke up to 20mm.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20S the Right Cylinder?
Select this 125mm bore when an application requires substantial thrust—stepping down to a 100mm bore yields 3927N at 0.5MPa, while this model provides 6136N. The adjustable stroke is ideal for variable end stops and machine setup, negating the need to bolt on external physical stops. Because the stroke is 475mm, the extended 32mm rod requires an external guide to prevent excessive side-loading and premature seal wear.
The rear adjuster acts strictly as a travel stop to set deceleration, not as a locking device; it will not hold a load without live air pressure. For dead-load holding, consider an AirTAC SAIL or BSAI variant. To match this ISO 15552 interchangeable cylinder exactly, confirm the 475mm stroke, 20mm adjustment, PT tapered port threads, and the -S magnet requirement.
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 SAIJ125X475-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear external screw acts as a mechanical stop, allowing you to shorten the 475mm nominal stroke by up to 20mm. This creates a usable travel window of 455-475mm for precise end-position tuning without changing the cylinder.
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