Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40
The AirTAC SAIJ125X125-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 125 mm travel to a precise 85-125 mm window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning with ease. This variant features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and utilizes PT tapered port threads.
Because the rear screw acts purely as a mechanical stop and does not lock the load without live air, you retain the full flexibility of standard pneumatic actuation. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments, omitting FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125AX125-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125AX125-40 Is Used
Variable End-Stop Forming
Dial in the exact 85-125 mm stroke window during metal forming operations to accommodate different material thicknesses without retooling the entire fixture.
Product Size Changeover
Quickly adjust the rear stopper on a packaging line to handle varying carton depths, utilizing the 6136 N push force to securely seal and press heavy containers.
Commissioning Fine-Tuning
Trim the effective travel by up to 40 mm during machine setup to prevent mechanical interference, ensuring precise positioning without physically altering the cylinder mount.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-40 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3927 N push at 0.5 MPa) is insufficient, but a 160 mm bore is physically too large. The 40 mm adjustment range is ideal for product changeovers, letting you fine-tune the end position at commissioning without swapping the cylinder or adding external stops. If your application requires holding the load without continuous air pressure, consider an AirTAC SAIL or BSAI series cylinder instead.
For an exact ISO 15552 replacement, match the 125 mm bore, 125 mm stroke, 40 mm adjustment, PT port thread, and your required mounting hardware. Note that this model ships without a magnet; adding the -S suffix enables compatibility with CMSE reed and DMSE electronic sensors. Operating speed for this bore size ranges from 30-500 mm/s.
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 SAIJ125AX125-40 FAQ
At 0.5 MPa operating pressure, 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 allows you to shorten the nominal 125 mm stroke by up to 40 mm, creating an adjustable travel window between 85 mm and 125 mm. This stopper only sets the end position and does not lock the load without live air pressure.
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