Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-75S 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 SAIJ125AX125-75S
The AirTAC SAIJ125X125-75-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 50-125mm, allowing you to dial back the nominal stroke by up to 75mm during commissioning without adding external stops.
This unit includes a SUS420J2 stainless steel rod (code A) for improved corrosion resistance and is equipped with a magnet (-S) for use with CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides, and it supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-75S |
|---|---|
| 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 SAIJ125AX125-75S
| 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 SAIJ125AX125-75S Is Used
Product Changeover
Dial in the exact retract position within the 50-125mm window during format changes without disassembling the machine.
Machine Setup
Fine-tune the end-stop during commissioning to perfect the stroke length for specialized pressing operations.
Variable End Stops
Adapt the cylinder travel on automated lines to accommodate different product sizes quickly and accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-75S the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder lacks thrust, as stepping up from 80mm increases push force at 0.5 MPa from 2513N to 6136N. The 75mm adjustment range is ideal for product-size changeovers on a line, letting you fine-tune the retract end-position on the fly instead of swapping out a fixed-stroke SAI cylinder. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for position holding without pressure, consider an SAIL or BSAI cylinder. As a dimensionally interchangeable ISO 15552 cylinder, ensure your replacement matches the 125mm bore, 125mm stroke, 75mm adjustment, PT tapered ports, and -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 SAIJ125AX125-75S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 125mm down to a minimum of 50mm, providing a 50-125mm usable travel window. It sets the travel end but does not lock or hold the load without continuous air pressure.
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