Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 90mm 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
- Stroke90 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20S
The AirTAC SAIJ125X90-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a 6136N pull force at 0.5 MPa and provides a usable travel window of 70 to 90 mm, letting you dial back the 90 mm nominal stroke by up to 20 mm during commissioning. This eliminates the need to swap cylinders or bolt on external stops when fine-tuning the retract end position.
Equipped with a carbon steel rod and a -S magnet for CMSE reed or DMSE electronic sensors, it integrates seamlessly into automated lines. The rear adjuster acts purely as a mechanical stop to set the end position and does not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 90 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 SAIJ125X90-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×90 | 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 SAIJ125X90-20S Is Used
Machine Changeover
Dial in the 70-90 mm travel window during product size changes on a packaging line without swapping hardware.
End-Stop Tuning
Fine-tune the retract position during commissioning using the 20 mm rear adjuster to hit exact mechanical stops.
High-Force Positioning
Leverage the 6136N pull force to move heavy jigs while retaining the flexibility to trim the stroke by 20 mm.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20S the Right Cylinder?
Choose this 125 mm bore when you need higher thrust than an 80 mm bore (which provides 2268N pull at 0.5 MPa) but less bulk than a 160 mm option. The adjustable stroke is ideal for product changeovers or variable end stops, offering a 70-90 mm travel window without replacing the entire unit. Unlike a fixed-stroke SAI cylinder, this model allows precise end-position tuning on the fly.
This cylinder uses PT tapered port threads and includes a magnet for sensor switches. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the stroke is under 300 mm, side-load risks are minimal, though the robust 32 mm rod thread handles standard stresses well. Remember that the adjuster is a stop, not a lock, so external rod locks are needed for position holding without air.
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 SAIJ125X90-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136N and a pull force of 5734N.
The 90 mm nominal stroke can be adjusted backward by up to 20 mm via a rear stopper screw, creating a usable travel window of 70 to 90 mm for precise end-position tuning.
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