Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 175mm 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
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20S
The AirTAC SAIJ125X175-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a 155-175mm usable travel window, allowing you to trim the effective stroke by up to 20mm during commissioning without swapping the cylinder. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting.
This SKU is configured with an SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic solid-state sensors. The rear screw acts purely as a travel stop to fine-tune the end position, meaning it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAIJ125AX175-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SAIJ125AX175-20S Is Used
Product Size Changeover
Dial in the 155-175mm travel window during format changeovers to accommodate different product lengths without physically swapping cylinders.
Machine Setup Tuning
Fine-tune the exact end-of-stroke position at commissioning using the rear stopper, avoiding the need to machine custom external spacers.
Heavy Material Handling
Leverage the 6136N thrust at 0.5MPa to push heavy workpieces securely into fixtures while relying on the standard ISO 15552 footprint.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20S the Right Cylinder?
Choose this 125mm bore when a 100mm bore (delivering 3927N push at 0.5MPa) is insufficient, but a 160mm bore (10053N) would be excessive overkill. The adjustable 155-175mm window is ideal for product-size changeovers on a line, providing variable end-stops without adding external stops. For load-holding without live air pressure, select a SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead, as the SAIJ adjuster is not a brake. When replacing an ISO 15552 cylinder, match the 125mm bore, 175mm stroke, 20mm adjustment, PT tapered port, mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), and the -S magnet.
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 SAIJ125AX175-20S 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 175mm nominal stroke by up to 20mm, creating a 155-175mm usable travel window. It functions as a mechanical stop for end-position tuning and is not a locking device.
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