Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-75 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 SAIJ125X750-75
The AirTAC SAIJ125X750-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. By turning the external rear screw, operators can shorten the effective travel, creating a precise 675 to 750mm usable stroke window without swapping the barrel. This on-machine fine-tuning is ideal for product changeovers or dialing in exact end positions during commissioning.
Featuring a 32mm carbon steel piston rod with an M27x2 thread, this large-bore unit handles substantial loads with a 40mm cushion length to absorb kinetic energy at travel ends. It uses a PT tapered G1/2 port and operates at 30 to 500mm/s. The extruded aluminum barrel includes sensor grooves on both sides, allowing direct mounting of CMSE reed or DMSE electronic sensors if a magnet is added later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-75 |
|---|---|
| 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 SAIJ125X750-75
| 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 SAIJ125X750-75 Is Used
Machine Changeover
Dial in the retract position by up to 75mm during product size changes without physically remounting the cylinder or adding external stopper blocks.
End-Position Tuning
Fine-tune the 675-750mm travel window at commissioning to perfect the seating force of large jigs or heavy pressing operations.
Variable Diverter Stroke
Adjust the retract distance of a heavy-duty diverter arm on the fly to accommodate different package widths on a shared conveyor line.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-75 the Right Cylinder?
When sizing this 125mm bore unit, stepping down to a 100mm bore reduces the 0.5MPa push force to 3927N, whereas moving up to a 160mm bore yields 10053N. Choose this adjustable SAIJ variant over a fixed-stroke SAI when a machine requires variable end stops or precise retract positioning without adding external physical stops.
Because the 750mm stroke is substantial, the unsupported rod is prone to side-loading; an external guide rail is recommended to prevent premature seal wear. For ISO 15552 replacement matching, specify the 125mm bore, 750mm stroke, 75mm adjustment, PT G1/2 port, and the correct mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster and air cushions only decelerate the load; they do not hold position without live air, so consider a SAIL or BSAI locking cylinder for fail-safe load holding.
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 SAIJ125X750-75 FAQ
At a 0.5 MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you trim the effective travel back from the 750mm nominal stroke down to a 675mm minimum. It sets the retract end-position and relies on the 40mm air cushion for deceleration, but it does not lock the load without continuous air pressure.
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