Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-75S 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 SAIJ125X85-75S
The AirTAC SAIJ125X85-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 10-85 mm from its 85 mm nominal stroke. Delivering 6136 N pull force at 0.5 MPa, it handles heavy product changeover tasks without requiring cylinder swaps. The carbon steel rod and PT tapered ports ensure robust, leak-free pneumatic connections.
This unit includes a magnet (-S) for position sensing with AirTAC CMSE reed and DMSE electronic switches, fitting directly into the dual-side sensor grooves. The rear adjuster acts purely as a mechanical stop to fine-tune the end position, meaning it will not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-75S |
|---|---|
| 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 SAIJ125X85-75S
| 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 SAIJ125X85-75S Is Used
Variable End-Stop Machining
Dial in the exact clamping depth for different material batches by trimming the travel window down to 10 mm on the fly.
Product Size Changeover
Accommodate varying package dimensions on a single conveyor line without physically replacing the pneumatic cylinder.
Machine Commissioning
Fine-tune the retract end-position during initial setup to perfect machine timing without adding external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-75S the Right Cylinder?
Choose this 125 mm bore if your application requires more force than the 80 mm version (which provides 2268 N pull at 0.5 MPa) but less than the 160 mm class. The 75 mm adjustment range is highly beneficial when you need precise variable end-stops during machine setup, avoiding the need to bolt on external stops or swap out a fixed-stroke SAI cylinder. To match an ISO 15552 replacement exactly, verify the 85 mm stroke, 75 mm adjustment, PT port threads, and the -S magnet requirement.
With a 32 mm rod diameter and M27x2 rod thread, this cylinder tolerates high side loads, though any stroke over 300 mm would still demand an external guide. The mounting set is restricted to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
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 SAIJ125X85-75S 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 its maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the effective travel from the 85 mm nominal stroke down to 10 mm, creating a 10-85 mm usable window. This adjuster functions only as a travel stop and does not lock the load without continuous air pressure.
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Standard models usually ship in 3-4 days.
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