Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20
The AirTAC SAIJ125X325-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136 N of pull force at 0.5 MPa and 8590 N of push force at 0.7 MPa, utilizing a 32 mm carbon steel rod with an M27x2 thread. The integrated PT (tapered) G1/2 porting handles the air supply for this robust actuator.
This made-to-order unit provides a 325 mm nominal stroke that can be dialed back by up to 20 mm, creating a precise 305-325 mm usable travel window. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches. It uses a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125X325-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125X325-20 Is Used
Variable End-Stop Tuning
Dial back the 325 mm stroke by up to 20 mm to perfectly tune the retracted end position during machine commissioning without replacing the actuator.
Product Size Changeover
Quickly adapt a packaging line for different carton sizes by adjusting the effective travel window between 305 and 325 mm during product transitions.
Heavy Forming Press
Leverage the 8590 N push force at 0.7 MPa for heavy pressing operations, using the rear stopper to precisely set the bottom-dead-center position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-20 the Right Cylinder?
Choose this adjustable model when your machine setup requires fine end-position tuning at commissioning or during product changeover, avoiding the need to swap the entire cylinder or bolt on external stops. If you need to step down force, the 100 mm bore offers 3681 N of pull at 0.5 MPa; stepping up to the 160 mm bore yields 9425 N of pull. For any stroke of 325 mm, an external guide is strongly recommended to prevent side-load damage to the rod.
This SAIJ125X325-20 is dimensionally interchangeable per ISO 15552. To match this exact replacement, verify the 125 mm bore, 325 mm stroke, 20 mm adjustment range, PT G1/2 port, and standard carbon steel rod without a magnet. Remember that the rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding, select an SAIL or BSAI series cylinder.
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 SAIJ125X325-20 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the 325 mm nominal stroke down to a minimum of 305 mm, providing a 305-325 mm usable window for fine-tuning without swapping cylinders.
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