Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 20mm 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
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-10S
The AirTAC SAIJ125X20-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 6136N pull force at 0.5 MPa and features a carbon steel piston rod with an M27x2 thread. A built-in magnet enables position sensing with CMSE reed or DMSE electronic sensors.
This configuration provides a 10 to 20 mm usable travel window, letting you dial back the nominal 20 mm stroke by up to 10 mm. The external rear stopper allows fine end-position tuning at commissioning without swapping the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 20 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 SAIJ125X20-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×20 | 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 SAIJ125X20-10S Is Used
Press Fitting
Dial in the exact 10 to 20 mm travel window during machine setup to press bearings accurately without over-travel.
End-Stop Tuning
Fine-tune the retract end-position during product changeovers using the rear screw, avoiding external stop hardware.
Short-Stroke Clamping
Secure heavy workpieces with up to 11045N of push force at 0.9 MPa while adjusting the clamping depth precisely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X20-10S the Right Cylinder?
Choose this 125 mm bore if your process demands high thrust, such as 6136N pull or 8590N push at 0.7 MPa. If your application requires less force, stepping down to a 100 mm bore yields a 3681N pull at 0.5 MPa, which may better suit lighter loads. The rear adjuster acts solely as a travel stop to set deceleration endpoints; it does not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series.
When replacing an ISO 15552 cylinder, verify the 125 mm bore, 20 mm stroke, 10 mm adjustment range, PT tapered port threads, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR configurations.
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 SAIJ125X20-10S FAQ
The rear adjuster is an external stopper that lets you shorten the effective stroke from 20 mm down to 10 mm, providing a 10 to 20 mm travel window for fine-tuning at commissioning.
At 0.5 MPa, it delivers 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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