Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75
The AirTAC SAIJ125X375-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. It features a 375mm nominal stroke that can be fine-tuned backward by up to 75mm, creating a precise 300-375mm usable travel window. This adjustability allows operators to dial in exact end positions during commissioning without swapping the cylinder or adding external stops.
Built with a carbon steel piston rod and a G1/2 port, this unit omits the FB, CA, CB, and CR mounts, utilizing a focused mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches, though a magnet is not included in this configuration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAIJ125X375-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAIJ125X375-75 Is Used
Variable End-Stop Positioning
Dial in the exact retraction point within the 300-375mm window to accommodate different material lengths on the fly without mechanical rebuilds.
Machine Setup & Changeover
Speed up product line transitions by using the 75mm rear screw to set new end positions quickly, minimizing downtime between production runs.
Heavy-Duty Forming Stops
Leverage the 6136N push force to halt heavy workpieces, using the adjustable stop to tune the deceleration distance for delicate parts.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-75 the Right Cylinder?
Choose this 125mm bore when a 100mm bore (offering 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore (10053N) would be excessive. The 75mm adjustment range is ideal for production lines running mixed product sizes, allowing rapid changeovers by simply turning the rear screw rather than changing out tooling.
Because the 375mm stroke exceeds the 300mm threshold, an external guide is recommended to prevent excessive side-loading on the 32mm carbon steel rod. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true pneumatic locking without pressure, consider the SAIL or BSAI series. To match this ISO 15552 footprint, specify the 125mm bore, 375mm stroke, 75mm adjustment, PT port thread, and the required mounting style.
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 SAIJ125X375-75 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At a maximum 1.0 MPa, the push force reaches 1251 kgf.
The rear adjuster screw allows you to shorten the effective stroke by up to 75mm from the 375mm nominal length, providing a usable travel range of 300-375mm. It functions as a mechanical stop to set the end position and does not lock the load without continuous air pressure.
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