Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75S
The AirTAC SAIJ125X185-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers robust thrust, generating 6136N of push force and 5734N of pull force at 0.5 MPa. The integrated -S magnet enables position detection, functioning seamlessly with AirTAC CMSE reed and DMSE electronic solid-state sensors housed within the dual-side sensor grooves.
Featuring a 185mm nominal stroke paired with a 75mm adjustment range, this unit yields a highly flexible 110-185mm usable travel window. This broad adjustment capability allows operators to dial in exact retract end positions during commissioning or product changeovers without swapping hardware. It utilizes a PT tapered port thread, a 32mm carbon steel rod, and variable air cushions at both ends to decelerate heavy loads smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125X185-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125X185-75S Is Used
Product Changeover
Quickly reconfigure the 110-185mm travel window on packaging lines to accommodate different carton sizes without replacing the cylinder.
End-Position Tuning
Fine-tune the retract stroke during machine commissioning to achieve exact clamping or pressing depths, avoiding costly mechanical shimming.
Heavy Forming Setup
Leverage the 6136N push force at 0.5 MPa for robust pressing operations, using the adjustment screw to set precise bottoming distances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-75S the Right Cylinder?
Select this 125mm bore when an application requires substantial force that exceeds the 3927N push capability of a 100mm cylinder, but does not demand the massive 10053N output of a 160mm unit. The adjustable stroke is chosen over a fixed SAI cylinder when a machine handles varying product sizes, allowing the retract end-stop to be fine-tuned on the fly. Because the 185mm stroke is below the 300mm threshold, external side-load guides are less critical, though the robust 32mm rod naturally handles higher eccentric loads.
For a direct ISO 15552 replacement match, ensure the target cylinder shares the 125mm bore, 185mm nominal stroke, 75mm adjustment, PT port, and -S magnet. Note that the rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure; for dead-air load holding, consider an AirTAC SAIL or BSAI cylinder. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X185-75S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster acts as an external stopper, allowing you to shorten the effective stroke by up to 75mm from the 185mm nominal length. This creates a usable travel window of 110-185mm, enabling precise end-position tuning without adding external stops.
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