Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20
The AirTAC SAIJ125X650-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 20 mm, creating a 630-650 mm usable window for precise end-position tuning at commissioning. It delivers a robust 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod for enhanced corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches, though this specific SKU is not configured with an internal magnet. The rear stopper acts solely as a travel delimiter and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAIJ125AX650-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAIJ125AX650-20 Is Used
Heavy-Duty Press Tuning
Dial in the exact 630-650 mm end-stop during machine setup to accommodate varying material thicknesses without replacing the entire actuator.
Product Changeover Diverter
Quickly adjust the retract position by up to 20 mm on a packaging line to handle different package sizes on the fly.
Large Assembly Jig
Use the 6136 N of force at 0.5 MPa to seat heavy components, relying on the rear stopper to fine-tune the final resting depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20 the Right Cylinder?
Choose this 125 mm bore when 80 mm falls short (providing only 2513 N at 0.5 MPa) and you need substantial thrust without jumping to the 160 mm class. The 20 mm adjustable range is ideal for product changeovers where the exact end-of-stroke varies slightly, eliminating the need to swap a fixed-stroke SAI cylinder or bolt on external stops. For load-holding without continuous air pressure, consider the SAIL or BSAI series instead.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 650 mm nominal stroke, 20 mm adjustment, PT G1/2 port, and your required mounting hardware. Supported SAIJ mountings include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 650 mm stroke is long, an external guide is recommended to prevent excessive side-loading on the 32 mm 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 SAIJ125AX650-20 FAQ
This 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. At 0.7 MPa, the push force increases to 8590 N.
The rear adjusting screw acts as an external stopper, allowing you to shorten the 650 mm nominal stroke by up to 20 mm, resulting in a 630-650 mm adjustable travel window. This mechanism decelerates the travel end but does not lock the load without live air pressure.
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