Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20S
The AirTAC SAIJ125X900-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 900mm nominal stroke that can be fine-tuned down by 20mm, providing an exact 880-900mm usable travel window for precision end-position tuning.
This variant includes a SUS420J2 stainless steel rod (code A) for improved corrosion resistance and a built-in magnet for CMSE and DMSE sensors. Operating at 30-500mm/s, it uses a G1/2 port and omits FB, CA, CB, and CR mounts, utilizing a reduced set of ISO 15552 mounting options: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125AX900-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAIJ125AX900-20S Is Used
Variable End-Stop Machining
Fine-tunes the 880-900mm travel window during commissioning to accommodate varying part lengths without adding external stops.
Product Line Changeover
Enables rapid adjustment of the rear stroke on automated assembly lines when switching between different product dimensions.
Long-Stroke Material Handling
Provides 6136N of push force for moving heavy loads over 900mm, with an external guide recommended for stability.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX900-20S the Right Cylinder?
Choose this 125mm bore when a 100mm bore (offering 3927N push at 0.5MPa) lacks thrust, but an 80mm bore is insufficient. The adjustable 880-900mm window is ideal for machine setups requiring variable end-stops or product changeovers without swapping cylinders. Because the stroke is 900mm, an external guide is recommended to handle side loads on the long unsupported rod.
The rear adjuster acts purely as a travel stop and does not hold the load without live air; for pilot-operated locking, consider the SAIL or BSAI series. For a direct ISO 15552 replacement, match the 125mm bore, 900mm stroke, 20mm adjustment, PT tapered port thread, mounting style, and the -S magnet requirement.
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 SAIJ125AX900-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel from the nominal 900mm down to 880mm, creating an 880-900mm usable window. This stopper fine-tunes the end position but does not lock the load without live air pressure.
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