Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-20 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 SAIJ125AX325-20
The AirTAC SAIJ125X325-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 6133N pull force at 0.5 MPa and uses a 32mm SUS420J2 stainless steel rod with PT G1/2 tapered ports. The rear adjustment screw allows you to trim the nominal 325mm stroke back by up to 20mm, creating a precise 305-325mm usable travel window for fine-tuning end positions at commissioning.
Because the stroke exceeds 300mm, the long unsupported piston rod requires an external guide to prevent excessive side-loading and premature seal wear. The extruded aluminum barrel includes sensor grooves on both sides, and the rear stopper acts purely as a travel stop. It decelerates the load alongside the 40mm air cushion but does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-20 |
|---|---|
| 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 SAIJ125AX325-20
| 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 SAIJ125AX325-20 Is Used
Machine Setup & Changeover
Dial in the exact 305-325mm travel window during commissioning to accommodate new product dimensions without replacing the entire cylinder.
Variable End-Stop Tuning
Use the rear adjusting screw to fine-tune the retract position precisely, absorbing mechanical tolerance variations on the assembly line.
Heavy-Duty Positioning
Leverage the 6136N pull force to move substantial masses, relying on the external stopper to set the final resting coordinates.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-20 the Right Cylinder?
Choose this adjustable-stroke model when you need to dial in a specific end-of-stroke position during machine setup or product changeover without swapping the cylinder or bolting on external stops. If your application requires less force, stepping down to a 100mm bore yields 3681N of pull at 0.5 MPa. For load-holding without continuous air pressure, this plain SAIJ is insufficient; you should select an SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead.
This SAIJ125X325-20 is dimensionally interchangeable per ISO 15552. To match this exact configuration, specify the 125mm bore, 325mm stroke, 20mm adjustment range, PT G1/2 ports, SUS420J2 stainless steel rod (code A), and no magnet (-S omitted). The mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX325-20 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 20mm. This creates a usable travel window of 305-325mm, letting you fine-tune the end position at commissioning without adding external stops.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, the push force increases to 12272N.
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