Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100S
The AirTAC SAIJ125X270-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. By turning the external stopper screw, you can shorten the effective travel, providing a 170 to 270 mm usable window for precise end-position tuning without swapping the cylinder. This model features a SUS420J2 stainless steel rod for enhanced corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors.
The rear adjuster acts purely as a travel stop to set the retract end position, meaning it will not hold the load without live air pressure. For load-holding without continuous pressure, consider an external pilot-operated check valve or related AirTAC types like SAIL or BSAI. This extruded aluminum barrel design uses a PT tapered port and operates at speeds of 30-500 mm/s.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125AX270-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125AX270-100S Is Used
Product Changeovers
Dial in the 170-270mm travel window during product size transitions without physically replacing the cylinder or adding external stops.
End-Position Tuning
Fine-tune the retract end-stop during machine commissioning to achieve exact positioning for critical tooling operations.
High-Force Assembly
Leverage the 6136N push force at 0.5MPa for heavy-duty assembly presses while retaining the flexibility to adjust stroke length on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-100S the Right Cylinder?
Choose this 125 mm bore when you need higher force than the 100 mm bore (which provides 3927N push at 0.5 MPa) but want to avoid the larger footprint of a 160 mm bore. An adjustable-stroke cylinder is selected over a fixed SAI model when you need on-the-fly commissioning fine-tuning or variable end-stops to handle product-size changes on a line. To match this ISO 15552 replacement exactly, specify a 125 mm bore, 270 mm stroke, 100 mm adjustment, PT ports, and the -S magnet option.
Because the nominal stroke is 270 mm, ensure your mounting setup adequately supports the rod to prevent excessive side-loading. The SAIJ series uses a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
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 SAIJ125AX270-100S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At 0.9 MPa, the push force increases to 11045N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 270mm nominal stroke by up to 100mm. This creates a usable travel window of 170-270mm for fine-tuning end positions.
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