Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75S
The AirTAC SAIJ125X85-75-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of pull force at 0.5MPa and provides a usable travel window of 10-85mm, letting you dial back the nominal 85mm stroke by up to 75mm during commissioning. This wide adjustment range is ideal for machines requiring highly flexible end-position tuning without swapping hardware.
This specific SKU is configured with a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. It operates at 30-500mm/s, uses a G1/2 port, and relies on a 40mm cushion at both ends to decelerate heavy loads smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAIJ125AX85-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAIJ125AX85-75S Is Used
Product Changeovers
Dial in the 10-85mm travel window rapidly when switching product sizes on a packaging line, avoiding mechanical rebuilds.
End-Position Tuning
Fine-tune the retract stop during machine commissioning to achieve exact pressing or clamping depths without adding external stops.
Heavy-Duty Forming
Leverage the 6136N pull force for large-scale forming operations where the rear adjuster sets the precise material deformation depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75S the Right Cylinder?
Choose this 125mm bore when a 100mm bore (providing 3927N push at 0.5MPa) lacks the thrust for your application, but a 160mm bore (10053N push) is physically oversized. The massive 75mm adjustment window allows precise end-stop tuning for product changeovers, unlike a fixed-stroke SAI cylinder. Because the stroke is 85mm, side-load risks are manageable, but always guide the load externally for stability.
Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider an AirTAC SAIL pneumatic lock, a BSAI clamp-lock cylinder, or an external pilot-operated check valve. To match this ISO 15552 interchangeable cylinder exactly, specify the 125mm bore, 85mm stroke, -75 adjustment, PT tapered port threads, and the -S magnet option.
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 SAIJ125AX85-75S FAQ
At 0.5MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw allows you to trim the effective stroke back by up to 75mm from the 85mm nominal length, creating a 10-85mm usable travel window. It functions as a physical stop, not a lock, so air pressure must be maintained to hold the load.
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