Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75S
The AirTAC SAIJ125X400-75-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 400mm nominal stroke that can be fine-tuned down by up to 75mm, yielding a usable travel window of 325-400mm. This built-in adjustability allows operators to dial in exact end positions during commissioning without adding external stops.
Included with this configuration is a magnet for position sensing (-S), compatible with AirTAC CMSE reed and DMSE electronic switches that mount directly into the dual-side sensor grooves on the extruded aluminum barrel. The 32mm carbon steel piston rod and M27x2 thread provide a robust interface for heavy loads, while the PT tapered port threads ensure a secure pneumatic connection.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125X400-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAIJ125X400-75S Is Used
Product Size Changeover
Quickly adapt machinery for different product lengths by dialing the rear adjuster to shift the 325-400mm travel window without swapping cylinders.
Heavy Press Tuning
Leverage the 6136N push force at 0.5 MPa for heavy pressing operations while fine-tuning the exact bottoming position during machine setup.
Variable End-Stop Positioning
Achieve precise retraction endpoints on automated assembly lines using the 75mm adjustment range instead of machining custom external stop blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75S the Right Cylinder?
Select this 125mm bore cylinder when an application requires substantial thrust—such as 6136N push or 5734N pull at 0.5 MPa—combined with variable end-stop positioning. If a fixed end position is sufficient and you need less force, stepping down to a 100mm bore provides 3927N push force. Because this model features a 400mm stroke, the extended 32mm rod will experience leverage forces under side loading; an external guide mechanism is recommended to prevent premature seal wear.
The rear adjuster on this SAIJ cylinder acts strictly as a travel stop for end-position tuning and does not lock or hold the load without continuous air pressure. For applications requiring true load-holding in the event of air loss, consider the AirTAC SAIL pneumatic lock or BSAI clamp-lock series. To match this ISO 15552 dimensionally interchangeable cylinder, specify the 125mm bore, 400mm stroke, 75mm adjustment, PT ports, your desired mounting style, and the -S magnet.
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 SAIJ125X400-75S FAQ
The rear adjuster acts as an external stopper that trims the effective travel. For this model, the 400mm nominal stroke can be reduced by up to 75mm, providing an adjustable operating window of 325-400mm to fine-tune the end position at commissioning.
Operating at 0.5 MPa, this double-acting cylinder provides 6136N of push force and 5734N of pull force. If operated at 0.7 MPa, the push force increases to 8590N.
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