Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-100 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 SAIJ125AX400-100
The AirTAC SAIJ125X400-100 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. It provides a generous 400 mm nominal stroke that can be dialed back by up to 100 mm, yielding a precise 300-400 mm usable travel window for product size changeovers. Delivering 6136 N pull force at 0.5 MPa, it handles heavy loads with ease.
This unit is built with a SUS420J2 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to mount CMSE reed or DMSE solid-state sensors directly without extra brackets. The rear adjuster acts purely as a travel stop and must not be confused with a lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-100 |
|---|---|
| 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 SAIJ125AX400-100
| 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 SAIJ125AX400-100 Is Used
Variable End-Stop Diverter
Fine-tune the reject stroke on a packaging line to handle different carton widths without physically remounting the actuator.
Machine Setup Changeover
Quickly dial in the 300-400 mm travel window during product line changeovers to accommodate new component sizes.
Heavy Assembly Press
Leverage the 6136 N pull force to seat heavy components, using the rear screw to precisely set the final pressing depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-100 the Right Cylinder?
Select this 125 mm bore when you need substantial thrust—stepping up from a 100 mm bore gives you a significant jump from 3681 N to 5734 N pull force at 0.5 MPa. Choose this adjustable-stroke variant over a fixed SAI model when your machine requires frequent end-position tuning or accommodates varying product lengths without swapping the cylinder. To match this ISO 15552 cylinder for a retrofit, confirm the 125 mm bore, 400 mm stroke, 100 mm adjustment, PT port, and your required mounting bracket.
Because the 400 mm stroke is substantial, the 32 mm rod diameter needs support to prevent excessive side loading; always use an external guide rail for heavy loads. Furthermore, the rear adjuster and air cushions only decelerate the load; they do not hold it without live air. For position holding, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder.
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 SAIJ125AX400-100 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.
The -100 code means the nominal 400 mm stroke can be mechanically shortened by up to 100 mm via a rear stopper screw. This creates a 300-400 mm adjustable travel window, allowing you to fine-tune the end position without adding external stops.
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