Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-20S 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 SAIJ125AX400-20S
The AirTAC SAIJ125X400-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers robust thrust, providing 6136N of pull force and 8590N of push force at 0.7 MPa. The integrated -20 adjustment code allows you to trim the nominal 400mm stroke back by up to 20mm, creating a precise 380-400mm usable travel window for fine-tuning at commissioning.
This variant features an SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet (-S) for use with CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the PT tapered port threads ensure a secure pneumatic connection. Air cushions at both ends manage deceleration, but remember the rear adjuster acts only as a travel stop, not a load lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-20S |
|---|---|
| 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 SAIJ125AX400-20S
| 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 SAIJ125AX400-20S Is Used
Product Changeover
Dial in the 380-400mm travel window during packaging line format changes to accommodate different carton sizes without swapping hardware.
End-Stop Tuning
Fine-tune the retract position on heavy presses, using the rear screw to set the exact 400mm limit during initial machine commissioning.
High-Force Positioning
Leverage the 6136N pull force to move heavy industrial platens, relying on the adjustable stop to absorb final position variations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-20S the Right Cylinder?
Select this 125mm bore cylinder when an application demands high force alongside variable end-positioning; if less force is required, stepping down to an 80mm bore yields 2268N of pull force at 0.5 MPa. The adjustable stroke is chosen over a fixed SAI cylinder when you need to dial in the exact end-stop during product changeovers without adding external stops. Because this model has a 400mm stroke, an external guide is recommended to prevent excessive side-loading on the 32mm rod. For position holding without live air pressure, this cylinder is insufficient—the adjuster is not a brake—so consider an AirTAC SAIL or BSAI lock variant. To match this ISO 15552 footprint, specify the 125mm bore, 400mm stroke, 20mm adjustment, PT ports, SUS420J2 rod, and -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 SAIJ125AX400-20S FAQ
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw lets you shorten the 400mm nominal stroke by up to 20mm, providing a usable travel window of 380-400mm. It functions as a travel stop and does not lock the load without air pressure.
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