Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-20S 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 SAIJ125X750-20S
The AirTAC SAIJ125X750-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 750mm nominal stroke that can be fine-tuned down by 20mm, giving you a precise 730-750mm usable travel window. This built-in adjustability allows you to dial in the exact retract end position during commissioning without adding external stops.
This bore size features a robust 32mm carbon steel piston rod with an M27x2 thread, paired with 40mm variable air cushions at both ends to manage kinetic energy. Because it carries the -S magnet option, it integrates seamlessly with AirTAC CMSE reed and DMSE electronic solid-state sensors mounted in the dual-side extruded barrel grooves. The mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-20S |
|---|---|
| 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 SAIJ125X750-20S
| 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 SAIJ125X750-20S Is Used
Product Size Changeovers
Dial in the 730-750mm retract position on the fly when adapting a production line to different product lengths, avoiding mechanical rebuilds.
Heavy Material Handling
Leverage the 6136N push force at 0.5MPa to move heavy pallets or chassis components, using the rear stopper to fine-tune the resting position.
Automated Press Setup
Use the 20mm adjustment window to set precise lower dead points during machine commissioning, ensuring accurate press fits without external shims.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-20S the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5MPa) lacks the necessary thrust, but stepping up to a 160mm bore (10053N) would be excessive. The adjustable 730-750mm travel window is ideal for machinery that requires variable end-stops for product size changeovers, replacing the need to swap out a fixed-stroke SAI cylinder. With a PT tapered port thread and standard carbon steel rod, it drops directly into ISO 15552 dimensional footprints.
Because the stroke is 750mm, the unsupported rod length is substantial; an external guide is recommended to prevent excessive side-loading and premature seal wear. Note that the rear adjuster and air cushions act only as travel stops and deceleration devices—they do not hold the load without live air. For positive load-holding, consider an AirTAC SAIL or BSAI cylinder. Operating speed for this bore is 30-500mm/s.
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 SAIJ125X750-20S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At a maximum 1.0MPa, it can deliver up to 1251kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 750mm nominal stroke by up to 20mm, creating a 730-750mm usable travel window. It only sets the end position; it does not lock the load without continuous air pressure.
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