Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20
The AirTAC SAIJ125X550-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 530-550mm usable travel window. Delivering 6136N of push force at 0.5 MPa, it handles heavy-duty positioning while allowing precise end-stop tuning during commissioning without external stops.
This variant uses a SUS420J2 stainless steel rod for enhanced corrosion resistance and accepts PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU omits the magnet, meaning external physical stops are required for position confirmation.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125AX550-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125AX550-20 Is Used
Product Changeover
Dial in the 530-550mm travel window quickly during format size changes on a packaging line without swapping out the entire actuator.
Heavy Press Tuning
Leverage the 6136N thrust capacity for pressing operations while fine-tuning the exact end position to accommodate material thickness variations.
Long-Stroke Assembly
Utilize the 550mm reach for large component assembly, using the rear stopper to precisely set the retraction distance without adding external bumpers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20 the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (3927N at 0.5 MPa) lacks the thrust for your process, but a 160mm bore (10053N) is physically oversized. The 20mm adjustment window is perfect for dialing in exact retraction distances during product changeovers. Because the stroke is 550mm, an external guide is strongly recommended to prevent excessive side-loading on the 32mm rod.
For a direct ISO 15552 replacement, match the 125mm bore, 550mm stroke, 20mm adjustment, PT port, and SUS420J2 rod material. Note that the rear adjuster acts only as a travel stop; it cannot hold a load without continuous air pressure. For fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125AX550-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can deliver up to 11045N of push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the 550mm nominal stroke by up to 20mm, creating a 530-550mm usable travel window. This stopper sets the end position but does not lock the load without live air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.