Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50S 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 SAIJ125AX475-50S
The AirTAC SAIJ125X475-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 425 to 475 mm, allowing you to trim up to 50 mm off the nominal stroke during commissioning without swapping the cylinder.
This SKU includes a SUS420J2 stainless steel rod (option A) for corrosion resistance and a built-in magnet (-S) for position sensing with AirTAC CMSE reed or DMSE electronic switches. The adjuster acts purely as a travel stop to set deceleration, so it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50S |
|---|---|
| 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 SAIJ125AX475-50S
| 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 SAIJ125AX475-50S Is Used
Machine Changeover
Dial in the exact end-stop position within the 425-475 mm window when switching product sizes on a packaging line.
Assembly Pressing
Apply up to 6136N of thrust at 0.5 MPa for pressing operations while fine-tuning the travel limit.
Variable End Stops
Use the rear adjuster screw to set precise retraction limits without installing external physical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX475-50S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927N push at 0.5 MPa) lacks the thrust for your heavy product changeovers, but a 160 mm bore (10053N at 0.5 MPa) is physically oversized. The adjustable stroke is ideal for fine-tuning end positions on the fly instead of relying on a fixed-stroke SAI cylinder.
Because the stroke is 475 mm, an external guide is recommended to prevent excessive side-loading on the 32 mm rod. To match this exact replacement, specify a 125 mm bore, 475 mm stroke, 50 mm adjustment, PT tapered ports, SUS420J2 rod, and a magnet. For load-holding without live air, use a SAIL or BSAI cylinder instead.
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 SAIJ125AX475-50S FAQ
At 0.5 MPa operating pressure, this 125 mm 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 lets you shorten the effective stroke by up to 50 mm, creating a usable travel window of 425 to 475 mm. The adjuster acts as a mechanical stop for end-position tuning and does not lock the load without air pressure.
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