Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 750mm 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
- Stroke750 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40
The AirTAC SAIJ125X750-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the effective travel window between 710 and 750 mm. It delivers a robust 6136 N of push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa, making it well-suited for heavy-duty positioning tasks. The extruded aluminum barrel features sensor grooves on both sides, enabling precise fitment of CMSE or DMSE switches for end-position confirmation.
This model uses a 32 mm carbon steel piston rod with an M27x2 thread, providing high rigidity to withstand substantial side loads. However, because the 750 mm stroke creates a long unsupported rod extension, incorporating an external guide mechanism is essential to prevent binding and premature seal wear. The rear stopper acts purely as a travel adjustment device, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 750 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 SAIJ125X750-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×750 | 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 SAIJ125X750-40 Is Used
Heavy Machinery Changeover
Dial in the 710-750 mm stroke window during heavy equipment setup, allowing rapid product size changeovers without physically swapping the actuator.
Variable End-Stop Positioning
Use the rear adjuster to set precise retraction limits on large jigs, tuning the end-of-travel position accurately during commissioning.
Large Assembly Pressing
Leverage the 11045 N of force at 0.9 MPa to secure heavy components, relying on the external stopper to set the exact pressing depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-40 the Right Cylinder?
Choose this 125 mm bore actuator when your application requires substantial thrust, such as 6136 N at 0.5 MPa, which is a significant step up from the 80 mm bore's 2513 N output. The 40 mm adjustment range is ideal for production lines needing variable end-stops during product size changeovers, offering far more flexibility than a fixed-stroke SAI cylinder.
When specifying this ISO 15552 interchangeable cylinder, confirm your requirements: a 750 mm stroke, up to 40 mm of rear adjustment, PT tapered port threads, and standard carbon steel rod material. Note that this actuator does not hold its load without live air pressure; for true fail-safe locking, consider the BSAI clamp-lock or SAIL pneumatic lock variants instead. Furthermore, the available mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options.
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 SAIJ125X750-40 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as an external stopper, allowing you to mechanically shorten the 750 mm nominal stroke by up to 40 mm, resulting in a usable travel window of 710 to 750 mm.
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 SAIJ125X750-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.