Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-30S 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 SAIJ125X115-30S
The AirTAC SAIJ125X115-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end-of-travel position without swapping out the hardware. By dialing back the nominal 115 mm stroke by up to 30 mm, you achieve a usable travel window of 85 to 115 mm for precise machine setup. Fitted with a PT tapered port and a carbon steel rod, this 125 mm bore unit generates 6136 N of push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
Because this configuration includes a magnet (-S), it directly supports AirTAC CMSE reed and DMSE solid-state sensors via the dual-sided extruded aluminum barrel grooves. The rear adjuster functions strictly as a mechanical stop to set deceleration and travel limits; it does not lock the load in place without continuous live air pressure. For applications requiring true load-holding, consider the related SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-30S |
|---|---|
| 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 SAIJ125X115-30S
| 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 SAIJ125X115-30S Is Used
Product Size Changeovers
Dial in the exact end-stop position for varying part lengths on a single conveyor line, utilizing the 85-115 mm travel window to switch products rapidly without changing cylinders.
Heavy-Duty Pressing
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the rear adjustment screw to perfectly tune the pressing depth at commissioning.
Sensor-Driven Sorting
Utilize the integrated magnet with DMSE solid-state sensors to confirm retraction limits, while the rear stopper fine-tunes the return position for high-speed sorting gates.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-30S the Right Cylinder?
Selecting this 125 mm bore model makes sense when your application requires substantial thrust—6136 N at 0.5 MPa or 8590 N at 0.7 MPa. If your process demands less force and faster cycle times, stepping down to an 80 mm bore (which provides 2513 N at 0.5 MPa) might be more efficient, as the 125 mm version is rated for a 30-500 mm/s speed range. The adjustable-stroke feature is chosen over a fixed-stroke SAI cylinder when you need variable end-stops to accommodate frequent product-size changeovers on the same line.
To replace an existing ISO 15552 cylinder, match the 125 mm bore, 115 mm stroke, and 30 mm adjustment range, ensuring you use the PT G1/2 port thread. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting FB, CA, CB, and CR brackets. Even though the 115 mm stroke is relatively short, always verify that your load is adequately guided to prevent excessive side-loading on the carbon steel rod.
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 SAIJ125X115-30S FAQ
The rear adjuster acts as an external mechanical stop that lets you shorten the effective travel by up to 30 mm. This creates a usable stroke window of 85 to 115 mm, allowing you to fine-tune the end position during setup without replacing the cylinder.
At a 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590 N.
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