Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20S
The AirTAC SAIJ125X900-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end position during commissioning. With a 900 mm nominal stroke and a 20 mm adjustment range, it provides a usable travel window of 880 to 900 mm. It delivers 6136 N of push force at 0.5 MPa and utilizes a robust 32 mm carbon steel rod with an M27x2 thread to handle high side loads.
This model includes a magnetic piston (-S) for use with AirTAC CMSE reed and DMSE electronic sensors, fitting neatly into the dual-side sensor grooves of the extruded aluminum barrel. It features PT tapered port threads (G1/2) and adjustable air cushions at both ends. The rear adjuster acts purely as a mechanical stop to set deceleration and end positions; it does not hold the load without live air pressure, so a SAIL or BSAI lock is needed for load-holding.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125X900-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAIJ125X900-20S Is Used
Long-Stroke Press Setup
Dial in the exact 880-900 mm end position during press commissioning to accommodate varying material thicknesses without adding external stops.
Product Changeover
Quickly adjust the retract distance for different package sizes on a packaging line, using the 20 mm trim window to adapt the stroke on the fly.
Automated Assembly Tuning
Fine-tune the end-of-stroke deceleration for heavy 125 mm bore assembly operations, ensuring precise positioning without replacing the cylinder.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-20S the Right Cylinder?
Choose this 125 mm bore cylinder when your application requires substantial force—stepping down to a 100 mm bore yields only 3927 N at 0.5 MPa, whereas this SAIJ provides 6136 N. The adjustable stroke is perfect for product changeovers or fine-tuning machine setups without swapping out the entire cylinder. Because the stroke is 900 mm, the long unsupported rod is susceptible to deflection; you must use an external guide to prevent excessive side-loading and premature seal wear.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 900 mm stroke, 20 mm adjustment, PT port threads, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting FB, CA, CB, and CR brackets to streamline your setup choices.
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 SAIJ125X900-20S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjusting screw acts as a mechanical stop, allowing you to trim the effective travel back by up to 20 mm. This creates an 880-900 mm usable stroke window for fine-tuning without swapping the cylinder.
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