Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-20
The AirTAC SAIJ125X210-20 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers substantial thrust, generating 8590N of pull force at 0.7MPa, making it suitable for heavy-duty positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This specific SKU provides a 190-210mm usable travel window, allowing you to trim the nominal 210mm stroke by up to 20mm during machine commissioning. It features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and comes standard with PT tapered port threads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 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 SAIJ125AX210-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125AX210-20 Is Used
Heavy Press Positioning
Dial in the exact 190-210mm end-stop during assembly line commissioning to accommodate varying material thicknesses without re-engineering the fixture.
Product Diversion
Adjust the retract distance on the fly to handle different package sizes on a sorting conveyor, ensuring positive contact without overtravel.
Machine Changeover
Rapidly reset the stroke window when switching production runs, using the rear stopper to fine-tune the end position rather than replacing the entire actuator.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-20 the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI cylinder when you need precise end-position tuning during product changeovers without swapping hardware or adding external stops. The rear adjuster screw acts purely as a travel stop to set deceleration; it does not hold the load. For position holding without live air pressure, select a SAIL pneumatic lock or BSAI clamp-lock cylinder.
When replacing an ISO 15552 cylinder, match the 125mm bore, 210mm nominal stroke, 20mm adjustment range, PT G1/2 port, and standard mounting interface. Note that SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets. Since the 210mm stroke is relatively long, ensure external guides support the load to prevent excessive side-loading on the rod.
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 SAIJ125AX210-20 FAQ
At 0.5MPa it provides 6136N push and 5734N pull. At 0.7MPa it delivers 8590N push and 8062N pull, with a maximum rated force of 1251 kgf at 1.0MPa.
The rear adjuster screw lets you shorten the effective travel from the nominal 210mm down to 190mm. This creates a 20mm tuning window for precise end-positioning without replacing the cylinder.
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