Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75S
The AirTAC SAIJ125X115-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 115 mm stroke that can be dialed back by up to 75 mm, yielding a highly flexible 40-115 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the rear stopper allows precise end-position tuning at commissioning without swapping the cylinder or adding external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAIJ125AX115-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SAIJ125AX115-75S Is Used
Product Changeover
Dial in new end positions rapidly during packaging line format changes using the 40-115 mm travel window without physically swapping cylinders.
Machine Setup
Fine-tune the retract stop during commissioning to dial out mechanical tolerances and achieve exact clamping positions on heavy fixtures.
Variable End Stops
Adapt pressing or locating operations on the fly for different material thicknesses by adjusting the rear screw up to 75 mm.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—6136 N at 0.5 MPa or up to 11045 N at 0.9 MPa—along with variable end-stop positioning. If you need less force, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa. The -75 adjustment code is ideal for product changeovers where the exact end position varies by up to 75 mm. Remember that the rear adjuster acts only as a travel stop to work with the air cushion for deceleration; it does not hold the load without live air. For load-holding without pressure, consider an AirTAC SAIL or BSAI cylinder, or an external rod lock.
To match this ISO 15552 cylinder for a replacement, verify the 125 mm bore, 115 mm stroke, 75 mm adjustment, PT tapered port thread, and the -S magnet. The 32 mm piston rod and M27x2 thread provide a robust interface, but any stroke over 300 mm requires an external guide to prevent side-loading; at 115 mm, the rod handles standard loads well. Supported mountings 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 SAIJ125AX115-75S 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 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as an external stop that shortens the effective travel. For this SAIJ125X115-75-S model, the 115 mm nominal stroke can be trimmed back by up to 75 mm, creating a usable travel window of 40-115 mm for precise end-position tuning.
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