Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-75S 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 SAIJ125X115-75S
The AirTAC SAIJ125X115-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 32mm carbon steel rod with an M27x2 thread. Because it carries the -S magnet, it directly supports AirTAC CMSE reed and DMSE electronic sensors for precise end-position detection.
This specific SKU provides a nominal 115mm stroke that can be dialed back by up to 75mm, creating a highly versatile 40-115mm usable travel window. This wide adjustment range is ideal for product changeovers on packaging lines, letting you fine-tune the retract end-position at commissioning without swapping the cylinder or bolting on external stops. The rear adjuster acts strictly as a travel stop, not a lock, so it cannot hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-75S |
|---|---|
| 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 SAIJ125X115-75S
| 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 SAIJ125X115-75S Is Used
Variable End-Stop Positioning
Leverage the 40-115mm travel window to dial in the exact retract distance during machine setup, accommodating multiple product sizes without physically replacing the cylinder.
Packaging Line Changeover
Quickly adjust the stroke by up to 75mm during product format changes on high-thrust packaging conveyors, reducing downtime and eliminating the need for external mechanical stops.
Press and Forming Operations
Utilize the 6136N push force for light pressing tasks while using the rear adjuster to fine-tune the tooling depth precisely, ensuring consistent manufacturing results.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-75S the Right Cylinder?
Selecting this 125mm bore adjustable cylinder makes sense when your machine requires high force (6136N at 0.5 MPa) alongside frequent end-position tuning. If your application needs less force, stepping down to an 80mm bore yields 2513N; if you need more, a 160mm bore provides 10053N. Choose this adjustable-stroke SAIJ over a fixed SAI when your product sizes vary and you need to alter the retract distance on the fly.
For an exact ISO 15552 replacement, match the 125mm bore, 115mm stroke, 75mm adjustment, PT tapered port threads, and the -S magnet. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 115mm stroke is relatively short for this large bore, side-loading is manageable, but the robust 32mm rod still requires an external guide for heavy lateral loads. For load-holding without live pressure, use an external rod lock or pilot-operated check valve.
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 SAIJ125X115-75S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf of push force.
The rear adjusting screw acts as a mechanical stop that lets you shorten the effective stroke from the nominal 115mm down to as little as 40mm. This creates a 40-115mm usable travel window for fine-tuning end positions at commissioning, but it functions as a stop and does not lock the load without live air pressure.
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