Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-75 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 SAIJ125AX750-75
The AirTAC SAIJ125X750-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136 N push force at 0.5 MPa, utilizing a 32 mm SUS420J2 stainless steel rod and G1/2 porting. The built-in adjuster allows you to trim the effective travel, providing a usable window of 675 to 750 mm for precise end-position tuning during commissioning.
This model uses a PT tapered port thread and operates at speeds between 30 and 500 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, though this unit omits the magnet, meaning CMSE or DMSE switches cannot be used without modification. The rear stopper solely sets the travel end and relies on the variable air cushion for deceleration; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-75 |
|---|---|
| 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 SAIJ125AX750-75
| 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 SAIJ125AX750-75 Is Used
Variable End Stops
Dials back the 750 mm stroke by up to 75 mm to accommodate varying material lengths without physically repositioning the cylinder assembly.
Machine Setup Changeover
Enables rapid fine-tuning of the retract position during product family transitions, minimizing machine downtime on the factory floor.
Large Format Actuation
Leverages the 6136 N push force at 0.5 MPa to move heavy fixtures across the full 675 to 750 mm travel window in heavy-duty automation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-75 the Right Cylinder?
Select this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore is physically oversized. The 75 mm adjustment range is ideal for product-size changeovers on a line, allowing you to dial back the 750 mm stroke to 675 mm without swapping the cylinder or adding external stops. For load-holding without live pressure, consider the SAIL or BSAI variants, as this adjuster is strictly a stop, not a lock.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 750 mm stroke, 75 mm adjustment, PT port, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because this is a long 750 mm stroke, the 32 mm rod will still experience leverage forces; an external guide is recommended to prevent excessive side-loading and premature seal wear.
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 SAIJ125AX750-75 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop that shortens the retract travel. For this SAIJ125X750-75 model, it creates an adjustable usable stroke window ranging from 675 mm to 750 mm.
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