Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20S
The AirTAC SAIJ125X125-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the effective travel to a 105-125 mm window. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads while allowing precise end-position tuning without swapping out hardware. This unit features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors.
Unlike a fixed-stroke SAI cylinder, this model lets you fine-tune the retract end-stop during commissioning or product changeovers. The rear adjuster acts strictly as a travel stop and does not hold the load without live air; for true position holding, consider the SAIL or BSAI series. It uses a PT tapered port and variable air cushions at both ends to manage deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125AX125-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125AX125-20S Is Used
Product Changeover
Dial in the 105-125 mm travel window during packaging line format changes to accommodate different carton sizes without changing the cylinder.
End-Stop Tuning
Use the rear adjuster to fine-tune the retracted position during machine commissioning, ensuring precise alignment of heavy 125 mm bore assemblies.
Heavy-Duty Positioning
Leverage 6136 N of thrust at 0.5 MPa to push heavy pallets or molds into exact working positions, relying on the stopper for repeatable end-of-stroke placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N at 0.5 MPa) lacks the necessary thrust, but you want to avoid stepping up to a 160 mm bore that delivers 10053 N. The adjustable 105-125 mm travel window is ideal for lines that require variable end-stops during product-size changes. If your machine needs to hold a load safely without continuous air pressure, this cylinder is not suitable—you should select a SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead.
To match this ISO 15552 interchangeable profile cylinder, specify a 125 mm bore, 125 mm stroke, 20 mm adjustment range, PT port thread, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Because the stroke is under 300 mm, side-load risks are moderate, but an external guide is still recommended for heavy lateral forces.
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 SAIJ125AX125-20S 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 the maximum pressure of 1.0 MPa, it delivers up to 1251 kgf.
The rear external screw stopper allows you to shorten the nominal 125 mm stroke by up to 20 mm, creating a usable travel window of 105-125 mm. The adjuster acts as a mechanical stop and does not lock the load without live air pressure.
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