Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-40S
The AirTAC SAIJ125X75-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and PT tapered ports. The integrated magnet (-S) enables precise position detection with AirTAC CMSE reed and DMSE electronic sensors.
This model provides a usable travel window of 35-75mm, allowing you to trim the nominal 75mm stroke by up to 40mm during commissioning. The rear screw acts purely as an end-position stop and works alongside variable air cushions at both ends, but it does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125AX75-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SAIJ125AX75-40S Is Used
Product Changeovers
Dial in the 35-75mm travel window during format size changes on a packaging line without physically swapping the actuator.
Heavy Clamping Setup
Leverage 6136N of thrust at 0.5 MPa to secure heavy workpieces while fine-tuning the exact clamp position at commissioning.
End-Stop Calibration
Use the rear adjuster to precisely set the retraction end position for automated assembly machinery.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX75-40S the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder (providing 2513N push at 0.5 MPa) lacks the thrust for heavy positioning tasks, but a 160mm bore is physically oversized. The 40mm adjustment range is ideal for product-size changeovers, letting you fine-tune the end stop without swapping hardware or adding external stops. For load-holding without continuous air, select a SAIL or BSAI cylinder instead of relying on the adjuster.
When replacing an ISO 15552 cylinder, match the 125mm bore, 75mm nominal stroke, 40mm adjustment, PT ports, and the -S magnet requirement. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Since the 32mm rod and M27x2 thread handle significant side loads, ensure proper external guiding for optimal longevity.
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 SAIJ125AX75-40S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster allows you to shorten the 75mm nominal stroke by up to 40mm, creating a usable travel window of 35-75mm. It functions as a mechanical stop and does not hold the load without live air pressure.
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Standard models usually ship in 3-4 days.
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