Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20S
The AirTAC SAIJ125X500-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its 500mm nominal stroke can be fine-tuned down by up to 20mm, creating a precise 480-500mm usable travel window. This built-in adjustability allows operators to dial in the exact retract end-position during commissioning without adding external stopper blocks.
This -S variant includes a magnet for CMSE and DMSE sensors and uses a PT tapered port thread. Because the 500mm stroke is long relative to the bore, an external guide is recommended to manage side loading. The rear screw acts as a travel stop for position tuning, not a lock; it will not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125X500-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125X500-20S Is Used
Product Changeovers
Quickly shift the retract end-stop by up to 20mm to accommodate slightly shorter product lengths on the line without changing out the entire actuator.
Heavy Fixture Seating
Leverage 6136N of push force at 0.5 MPa to seat heavy tooling, using the fine-tune screw to dial in the exact clamping position during machine commissioning.
Long-Stroke Material Handling
Move large pallets or workpieces across a 500mm span, relying on the integrated air cushion and external guides to handle the extended travel safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-20S the Right Cylinder?
Choose this 125mm bore when a smaller 100mm cylinder (providing 3927N push at 0.5 MPa) lacks the thrust for your heavy fixture, but a 160mm bore is physically oversized. The adjustable 480-500mm window is ideal for product-size changeovers on a line, letting you shift the retract stopper without swapping the entire cylinder for a fixed-stroke SAI model.
For a drop-in ISO 15552 replacement, match the 125mm bore, 500mm stroke, PT port thread, and -S magnet. If your machine requires load-holding without continuous air pressure, note that this rear adjuster only sets the travel end—you would need a SAIL pneumatic lock or an external rod lock instead. Supported mounts include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X500-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the 500mm nominal stroke by up to 20mm, providing a usable travel window of 480-500mm. This stopper fine-tunes 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 SAIJ125X500-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.