Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-20S 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 SAIJ125AX750-20S
The AirTAC SAIJ125X750-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS420J2 stainless steel rod and a PT tapered port. By integrating an external adjusting screw at the rear, this unit allows you to trim the effective stroke by up to 20 mm, creating a precise 730-750 mm usable travel window without swapping out the entire actuator.
Because the nominal 750 mm stroke is substantial, the 32 mm rod and M27x2 thread provide necessary rigidity, though an external guide is still recommended to manage side loads on long extensions. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated magnet (-S) directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for accurate position feedback.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-20S |
|---|---|
| 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 SAIJ125AX750-20S
| 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 SAIJ125AX750-20S Is Used
Variable End-Stop Positioning
Dial in the exact 730-750 mm end position during machine commissioning to accommodate varying workpiece lengths without adding external mechanical stops.
Product Line Changeover
Quickly adjust the stroke by up to 20 mm when switching the manufacturing line to a new product size, minimizing downtime and retooling effort.
Heavy Assembly Pressing
Leverage the 6136N push force at 0.5 MPa to seat heavy components, using the rear stopper to fine-tune the final pressing depth safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX750-20S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513N push at 0.5 MPa) lacks the thrust for heavy positioning, but a 160 mm bore (10053N) would be excessive. The adjustable stroke is ideal for machine setups requiring variable end-stops during product changeovers, replacing the need to bolt on external stops or buy a fixed-stroke SAI cylinder. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
For any stroke of 750 mm, always support the load with an external guide to prevent excessive side loading on the rod. Remember that the rear adjuster acts strictly as a travel stop to set deceleration, not as a locking device; this cylinder cannot hold a load without live air. For true load-holding without pneumatic pressure, consider an AirTAC SAIL or BSAI cylinder instead.
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 SAIJ125AX750-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjusting screw acts as an external stopper, allowing you to shorten the 750 mm nominal stroke by up to 20 mm. This creates a usable travel window of 730-750 mm for fine-tuning the retract end position at commissioning.
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