Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-75S 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 SAIJ125X750-75S
The AirTAC SAIJ125X750-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a 750mm nominal stroke that can be fine-tuned down by up to 75mm, creating a precise 675-750mm usable travel window. This built-in adjustability allows you to dial in the retract end position during commissioning without adding external stops.
Fitted with a carbon steel rod and PT tapered ports, this unit includes a magnet (-S) for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel provides sensor grooves on both sides. Because the 750mm stroke is relatively long, the 32mm rod diameter handles substantial loads, but an external guide is recommended to prevent excessive side-loading on the piston.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-75S |
|---|---|
| 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 SAIJ125X750-75S
| 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 SAIJ125X750-75S Is Used
Product Changeovers
Quickly reset the 675-750mm travel window on packaging lines when switching to different carton sizes without changing the cylinder.
Machine Setup
Fine-tune the retract end position during initial commissioning to achieve exact positioning without machining external stop blocks.
Variable End Stops
Dial in the precise end-of-stroke location for heavy-duty material handling actuators operating at speeds up to 500mm/s.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-75S the Right Cylinder?
Choose this 125mm bore when a 100mm bore (providing 3927N push at 0.5MPa) lacks the necessary thrust, but a 160mm bore (10053N) would be physically oversized. The 75mm adjustment range is ideal for machinery requiring frequent product-size changeovers, letting operators reset the retract distance on the fly instead of swapping out a fixed-stroke SAI cylinder. When matching your ISO 15552 replacement, verify the 750mm stroke, 75mm adjuster, PT port threads, and the required -S magnet.
Keep in mind the rear adjuster functions strictly as a travel stop, not a locking device. It cannot hold a load without continuous air pressure. If your application requires true load-holding, consider an AirTAC SAIL pneumatic lock or a BSAI clamp-lock cylinder instead. Mounting options 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 SAIJ125X750-75S FAQ
At 0.5MPa it provides 6136N push and 5734N pull force. At 0.7MPa the push increases to 8590N. The maximum push force is 11045N at 0.9MPa.
The rear adjuster acts as a stop that lets you shorten the effective stroke by up to 75mm. This creates a usable travel window of 675-750mm, allowing you to trim the retract position without replacing the cylinder.
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