Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75
The AirTAC SAIJ125X115-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. By turning the external stopper screw, you can shorten the effective travel from its 115 mm nominal length down to 40 mm, creating a 75 mm adjustable window. This allows precise end-position tuning at commissioning without swapping out the entire cylinder or adding external mechanical stops.
Built with a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance, this 125 mm bore unit features a PT tapered port (G1/2) and operates at speeds of 30-500 mm/s. The extruded aluminum barrel includes sensor grooves on both sides for flexible CMSE or DMSE sensor mounting. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAIJ125AX115-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SAIJ125AX115-75 Is Used
Machine Changeover
Quickly dial in the stroke from 115 mm down to 40 mm during product size changes on a packaging line, eliminating the need to physically swap cylinders for different part lengths.
End-Position Tuning
Fine-tune the exact retract end-stop during initial commissioning to achieve precise mechanical positioning without adding external stopper blocks to the fixture.
Variable End Stops
Adapt clamping and pressing travel on the fly for multi-variant production runs, using the 75 mm adjustment window to accommodate varying material thicknesses.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513N push at 0.5 MPa) lacks sufficient force, but a 160 mm bore (delivering 10053N) would be physically oversized. The SAIJ125X115-75 is selected specifically when a 40-115 mm variable end-stop is required for machine setup or product-size changeovers, offering greater setup flexibility than a fixed-stroke SAI cylinder. If your application requires the load to be held in place without continuous compressed air, the rear adjuster will not achieve this; you must integrate an external rod lock or pilot-operated check valve, or switch to a SAIL or BSAI series cylinder.
To match this ISO 15552 interchangeable cylinder for a replacement, verify the 125 mm bore, 115 mm stroke, 75 mm adjustment range, PT port thread, and standard mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that SAIJ omits the FB, CA, CB, and CR mounting styles. Because the 115 mm stroke is relatively short for this large bore, side-load risks are minimal, but an external guide is still recommended for heavy lateral loads.
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 SAIJ125AX115-75 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. If you increase the pressure to 0.7 MPa, the push force rises to 8590 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 115 mm nominal stroke by up to 75 mm, providing a usable travel window of 40 to 115 mm. It only decelerates and sets the travel end; it does not lock or hold the load without live air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-75
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.