Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-100S 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 SAIJ125AX400-100S
The AirTAC SAIJ125X400-100-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 400 mm stroke that can be dialed back by up to 100 mm, creating a 300-400 mm usable travel window for precise end-position tuning during commissioning. Delivering 6136 N pull force at 0.5 MPa, it handles heavy loads while maintaining a standard ISO 15552 mounting footprint.
This model includes a SUS420J2 stainless steel rod (code A) for superior corrosion resistance and uses PT tapered port threads (G1/2). The extruded aluminum barrel features sensor grooves on both sides, and the integrated magnet (-S) works directly with AirTAC CMSE reed and DMSE electronic solid-state switches. The rear adjuster acts purely as a travel stop to fine-tune deceleration, not as a load lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-100S |
|---|---|
| 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 SAIJ125AX400-100S
| 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 SAIJ125AX400-100S Is Used
Variable End-Stop Forming
Dial in the 300-400 mm travel window during press setups to accommodate different material lengths without adding external mechanical stops.
Product Changeover Diverter
Quickly adjust the retract position on packaging lines when switching box sizes, using the 100 mm trim range to fine-tune the diverter arm.
Heavy Load Positioning
Leverage the 6136 N pull force to shift heavy pallets, tuning the end-stop precisely to match machine infeed sensors.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-100S the Right Cylinder?
Choose this 125 mm bore when an application requires heavy thrust (6136 N pull at 0.5 MPa) and on-the-fly variable end stops without swapping cylinders. If you need less force, stepping down to an 80 mm bore yields 2268 N pull, whereas moving up to a 160 mm bore provides 9425 N pull. The adjustable stroke is ideal for machine setups requiring frequent product-size changeovers, replacing fixed-stroke SAI cylinders when exact end-of-travel positions fluctuate.
For ISO 15552 replacement matching, specify a 125 mm bore, 400 mm nominal stroke, 100 mm adjustment range, PT tapered G1/2 ports, and a magnet for CMSE/DMSE sensors. Because the stroke is 400 mm, an external guide is recommended to prevent rod side-loading and premature seal wear. Remember that the rear adjuster and air cushions do not hold loads without live air; for fail-safe load holding, select an AirTAC SAIL or BSAI cylinder instead.
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 SAIJ125AX400-100S FAQ
The rear adjuster screw acts as an external stopper, allowing you to shorten the effective stroke by up to 100 mm. This creates a usable travel window of 300-400 mm, letting you fine-tune the retract end position at commissioning without changing the cylinder.
At a 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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