Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50 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 SAIJ125X375-50
The AirTAC SAIJ125X375-50 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stopper that allows you to fine-tune the end-of-stroke position. With a 375mm nominal stroke and a 50mm adjustment range, it provides a usable travel window of 325 to 375mm. This built-in adjustability eliminates the need to swap physical cylinders or bolt on external stops during machine commissioning or product changeovers.
Operating at 0.5 MPa, this 125mm bore generates 6136N of push force and 5734N of pull force. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE position switches. It uses a robust 32mm carbon steel rod with an M27x2 thread, and the PT tapered port ensures a tight pneumatic connection.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50 |
|---|---|
| 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 SAIJ125X375-50
| 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 SAIJ125X375-50 Is Used
Product Changeover
Dial in the exact 325 to 375mm end-stop position on a packaging line when switching to a different carton size.
Machine Setup
Fine-tune the retract distance during initial commissioning without machining custom spacer blocks.
Variable End Stops
Adjust the rear stopper to accommodate varying material lengths on an assembly press.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50 the Right Cylinder?
Choose this adjustable-stroke model when an application requires precise end-position tuning at commissioning without the rigid constraints of a fixed-stroke SAI cylinder. If your force requirements are lower, stepping down to a 100mm bore yields 3927N of push force at 0.5 MPa. Because the 375mm stroke is substantial, an external guide is recommended to prevent side-loading damage to the 32mm rod.
The rear adjuster functions strictly as a travel stop and works with the variable air cushions to decelerate the load, but it does not hold the load without live air pressure. For true load-holding without continuous air, consider an external rod lock or explore the SAIL or BSAI series. To replace this ISO 15552 cylinder, match the 125mm bore, 375mm stroke, 50mm adjustment, PT port, and basic mounting interface.
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 SAIJ125X375-50 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The external rear adjuster acts as a mechanical stopper, allowing you to shorten the effective travel from 375mm down to 325mm. This provides a 50mm tuning window to set the exact end position without replacing the cylinder.
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