Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-20S 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 SAIJ125AX325-20S
The AirTAC SAIJ125X325-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 325 mm travel by up to 20 mm for a precise 305-325 mm usable window. It delivers substantial thrust, pushing 8590 N and pulling 5734 N at 0.7 MPa. This makes it well-suited for heavy-duty positioning tasks requiring exact end-stop tuning during commissioning.
This specific SKU is built with an SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel features sensor grooves on both sides, and the standard PT tapered porting is G1/2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-20S |
|---|---|
| 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 SAIJ125AX325-20S
| 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 SAIJ125AX325-20S Is Used
Product Changeover
Dial in the 305-325 mm end-stop during format size changes on a packaging line without bolting on external physical stops.
Heavy Press Fit
Leverage the 8590 N push force at 0.7 MPa to seat heavy components, using the adjuster to fine-tune the exact insertion depth.
Machine Setup
Perfect the retract position during initial commissioning to prevent mechanical crashes, relying on the 20 mm trim window.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-20S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 3518 N push at 0.7 MPa) lacks the force for heavy payloads, but a 160 mm bore (14074 N at 0.7 MPa) would be excessive. The adjustable stroke is ideal for product changeovers on a line, letting you fine-tune the end position without swapping the cylinder or adding external stops. Because the nominal stroke is 325 mm, an external guide is recommended to prevent excessive side-loading on the rod.
To match this exact configuration for an ISO 15552 replacement, specify: 125 mm bore, 325 mm stroke, 20 mm adjustment, PT G1/2 port, SUS420J2 rod, and the -S magnet. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider the SAIL or BSAI series. Mounting options include 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 SAIJ125AX325-20S FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 325 mm nominal stroke by up to 20 mm, creating a 305-325 mm travel window. It only sets the end position and does not lock the load without live air pressure.
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