Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50S
The AirTAC SAIJ125X55-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the nominal 55 mm travel back by up to 50 mm, yielding a highly versatile 5 to 55 mm usable window. It delivers 6136 N of push force at 0.5 MPa and accommodates PT tapered port threads with a G1/2 connection. Equipped with a standard magnet, it integrates seamlessly with CMSE reed and DMSE electronic solid-state sensors.
This adjustable design allows operators to fine-tune end positions at commissioning or during product changeovers without swapping the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the carbon steel rod provides durable service in demanding industrial environments.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAIJ125X55-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAIJ125X55-50S Is Used
Product Changeover
Dial in the exact end position for different product sizes on a packaging line without physically swapping cylinders or adding shims.
Commissioning Calibration
Fine-tune the travel window from 5 to 55 mm during machine setup to perfect the pressing or clamping depth on the fly.
Variable End Stops
Use the rear adjuster to set precise deceleration points for heavy 125 mm bore loads without relying on external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-50S the Right Cylinder?
Choose this 125 mm bore model when an application requires substantial thrust—6136 N at 0.5 MPa or up to 11045 N at 0.9 MPa—combined with precise, variable end-stop control. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053 N. The rear adjuster acts solely as a travel stop to set deceleration; it does not hold the load without live air. For true load-holding without continuous pressure, consider the SAIL or BSAI series.
As a dimensionally interchangeable ISO 15552 cylinder, it replaces comparable profile cylinders using the exact bore, 55 mm stroke, 50 mm adjustment, PT port, and -S magnet specifications. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting FB, CA, CB, and CR. Because the stroke is short, side-loading is minimal, but an external guide is always recommended for heavy 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 SAIJ125X55-50S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw shortens the 55 mm nominal stroke by up to 50 mm, creating a usable travel window of 5 to 55 mm. This allows precise end-position tuning without changing the cylinder.
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