Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 475mm 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
- Stroke475 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20S
The AirTAC SAIJ125X475-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 455 to 475 mm, allowing you to dial back the nominal stroke by up to 20 mm during commissioning without adding external stops. It delivers robust force, pushing 6133N and pulling 5734N at 0.5 MPa, making it suitable for heavy payloads.
This specific SKU includes a SUS420J2 stainless steel rod for enhanced corrosion resistance and a built-in magnet for CMSE reed and DMSE electronic sensors. The PT tapered ports and extruded aluminum barrel with dual sensor grooves ensure reliable sealing and straightforward switch mounting. It supports speeds of 30-500 mm/s and uses the standard SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 475 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 SAIJ125AX475-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×475 | 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 SAIJ125AX475-20S Is Used
Product Size Changeover
Quickly modify the effective retract distance by up to 20 mm when switching part sizes on a packaging line, eliminating the need to physically swap cylinders.
End-Position Tuning
Dial in the exact 455 to 475 mm travel window during machine setup to perfect pressing or clamping depth without adding external mechanical stops.
Heavy Payload Transfer
Leverage the 6133N push force at 0.5 MPa to move heavy materials between stations while relying on the 40 mm air cushions to absorb kinetic energy.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-20S the Right Cylinder?
Select this 125 mm bore when 100 mm (pushing 3927N at 0.5 MPa) is insufficient, but 160 mm (pushing 10053N) would be excessive. An adjustable stroke is ideal for production lines requiring frequent product-size changeovers, as the rear screw fine-tunes the retract end position instantly. Because the 475 mm stroke is long, an external guide is strongly recommended to handle side loads and prevent rod binding.
For an exact ISO 15552 replacement, match the 125 mm bore, 475 mm nominal stroke, 20 mm adjustment range, PT G1/2 port, and the -S magnet. Remember that the rear adjuster acts only as a travel stop and the air cushions manage deceleration; neither holds the load without live air. For true load-holding without pressure, use a SAIL pneumatic lock, BSAI clamp-lock, or external rod lock.
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 SAIJ125AX475-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6133N and a pull force of 5734N. It can reach a maximum push force of 1251 kgf at 1.0 MPa.
The rear adjuster screw allows you to shorten the effective stroke within a 455 to 475 mm travel window. It acts as a mechanical stop to fine-tune the end position at commissioning, but it does not lock the load without live air pressure.
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