Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-75S
The AirTAC SAIJ125X140-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end position without adding external stops. It provides a usable travel window of 65 to 140 mm by trimming up to 75 mm off the nominal stroke. Built with a SUS420J2 stainless steel rod (material code A), it handles heavy loads with a 0.5 MPa push force of 6136 N and a pull force of 5734 N.
This model includes a magnet (-S) for position sensing with AirTAC CMSE reed or DMSE electronic switches. The extruded aluminum barrel features sensor grooves on both sides for flexible mounting. It operates at speeds of 30-500 mm/s and uses PT G1/2 tapered ports. The rear adjuster acts purely as a travel stop to set deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125AX140-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125AX140-75S Is Used
Product Changeover
Dial in the exact end-position during format size changes on packaging lines without swapping out the entire actuator.
Machine Setup
Fine-tune the retract travel window during initial commissioning to perfect the timing of heavy 125 mm bore assemblies.
Variable End Stops
Adjust the stroke on the fly to accommodate different material lengths or tooling depths in automated machining cells.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX140-75S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires a 6136 N push force at 0.5 MPa and a highly variable end-stop within a 65-140 mm range. If you need less force, stepping down to an 80 mm bore yields 2513 N. Because the stroke is 140 mm, side-loading is minimal, but always ensure the load is guided to prevent undue stress on the 32 mm rod. The SAIJ is chosen over a fixed SAI when machine setups require frequent product-size changeovers and commissioning adjustments.
For a true ISO 15552 replacement match, verify the 125 mm bore, 140 mm stroke, 75 mm adjustment, PT G1/2 ports, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. Remember that the rear adjuster is not a lock; for load-holding without live pressure, consider the SAIL or BSAI series.
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 SAIJ125AX140-75S FAQ
The rear adjuster allows you to trim the effective travel by up to 75 mm, creating a usable stroke window of 65 to 140 mm. It functions as a mechanical stop to set the travel end and deceleration, but it does not lock or hold the load without continuous air pressure.
At 0.5 MPa, it provides a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
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