Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-50S 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 SAIJ125AX125-50S
The AirTAC SAIJ125X125-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 75-125 mm usable travel window, allowing you to trim the 125 mm nominal stroke by up to 50 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads with precision.
This SKU features an SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated magnet (-S) supports CMSE reed and DMSE solid-state switches. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-50S |
|---|---|
| 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 SAIJ125AX125-50S
| 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 SAIJ125AX125-50S Is Used
Product Changeovers
Dial the retract position back by up to 50 mm to accommodate different product lengths on the same line without mechanical rebuilds.
End-Position Tuning
Fine-tune the 75-125 mm travel window at machine setup to perfect the seating force of heavy 125 mm bore tooling.
Heavy Assembly Pressing
Leverage 6136 N of thrust at 0.5 MPa for robust pressing tasks while relying on the rear stop to set exact depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-50S the Right Cylinder?
Choose this 125 mm bore when you need higher force than the 100 mm bore (which provides 3927 N push at 0.5 MPa) but want to avoid the bulk of a 160 mm cylinder. The 50 mm adjustment range is ideal for product-size changeovers, letting you fine-tune the retract end-position without swapping hardware or adding external stops. To replace an ISO 15552 cylinder, match the 125 mm bore, 125 mm stroke, PT ports, and your required mounting from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2. For load-holding without continuous air, consider the SAIL or BSAI series, as the adjuster here is not a 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 SAIJ125AX125-50S FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull force. At 0.7 MPa, the push force increases to 8590 N.
A rear screw stopper lets you shorten the 125 mm nominal stroke by up to 50 mm, creating a 75-125 mm adjustable travel window. It sets the end position but does not lock the load without live air.
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Standard models usually ship in 3-4 days.
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