Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20 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 SAIJ125X90-20
The AirTAC SAIJ125X90-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 125 mm bore generating 6136 N of push force at 0.5 MPa and a 90 mm nominal stroke. The integrated adjuster allows you to trim the effective travel back by up to 20 mm, providing a usable 70-90 mm positioning window for exact product changeovers.
This pneumatic actuator utilizes a carbon steel piston rod and PT tapered port threads. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. The rear stopper screw sets the retract end position during commissioning, but it does not function as a load lock; use a SAIL or BSAI variant for positive holding without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20 |
|---|---|
| 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 SAIJ125X90-20
| 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 SAIJ125X90-20 Is Used
Variable End Stops
Dial in the 70-90 mm travel window during machine setup to accommodate different product lengths without swapping out the entire actuator.
Line Changeover
Quickly reconfigure retract positions on packaging lines, utilizing the 6136 N push force to handle substantial payloads during production transitions.
Position Tuning
Fine-tune the final end-of-stroke position at commissioning to perfect mechanical timing, avoiding the need to add bulky external physical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X90-20 the Right Cylinder?
Choose this 125 mm bore actuator when your application requires the 6136 N push force at 0.5 MPa and on-the-fly end-position tuning. If your setup only needs the 3927 N push force of a 100 mm bore, stepping down saves air volume, while moving to a 160 mm bore yields 10053 N for heavier loads. The adjustable stroke is ideal for variable end stops, whereas a fixed SAI cylinder suits dedicated single-purpose stations.
For ISO 15552 replacement matching, specify the 125 mm bore, 90 mm stroke, 20 mm adjustment range, PT port threads, and the required mounting bracket. Since the nominal stroke is under 300 mm, side-load stress on the 32 mm rod is manageable, but external guides remain recommended for heavy lateral loads.
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 SAIJ125X90-20 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 a maximum 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster screw lets you shorten the 90 mm nominal stroke by up to 20 mm, creating a 70-90 mm usable travel window. This stopper sets the end position but does not lock the load without continuous air pressure.
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