Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-40 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 SAIJ125X75-40
The AirTAC SAIJ125X75-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 35 to 75 mm, allowing you to dial back the nominal 75 mm stroke by up to 40 mm during machine commissioning. This bore delivers a robust 6136 N push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
It features a carbon steel piston rod with an M27x2 thread, sized to handle substantial side loads, though external guidance is still recommended for optimal longevity. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches if a magnet is added later. Sealing options include high-temperature Viton H for demanding environments.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-40 |
|---|---|
| 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 SAIJ125X75-40
| 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 SAIJ125X75-40 Is Used
Press Stroke Tuning
Fine-tune the exact end-of-stroke contact point on a pressing or stamping station within the 35-75 mm window without physically changing the cylinder.
Product Changeover
Quickly adapt the retract position on a packaging line when switching to a different product size by rotating the rear adjustment screw.
Heavy Load Positioning
Leverage the 6136 N push force to move heavy assemblies into a precise working zone, using the adjustable stop to set the exact datum.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-40 the Right Cylinder?
Select this 125 mm bore when an application requires high thrust—stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N, while this model provides 6136 N. The integrated rear adjuster is chosen over a fixed-stroke SAI cylinder when you need variable end-stops for product changeovers, eliminating the need to bolt on external stops or swap the entire actuator. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true fail-safe load holding, consider the SAIL or BSAI series. To match this ISO 15552 footprint, specify the 125 mm bore, 75 mm stroke, 40 mm adjustment, PT tapered ports, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting styles.
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 SAIJ125X75-40 FAQ
The rear adjuster is an external mechanical stop that lets you shorten the effective stroke from 75 mm down to as little as 35 mm, providing a 40 mm tuning window. It sets the travel end position but does not lock or hold the load without continuous air pressure.
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. It can deliver up to 11045 N of push force at 0.9 MPa.
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Standard models usually ship in 3-4 days.
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