Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-20S 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 SAIJ125X185-20S
The AirTAC SAIJ125X185-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 165 to 185 mm, allowing you to dial back the nominal 185 mm stroke by up to 20 mm during machine commissioning. This bore size delivers substantial thrust, pushing with 6136 N and pulling with 5734 N at 0.5 MPa.
This -S variant includes a magnet for position sensing and works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches. The extruded aluminum barrel features sensor grooves on both sides. It uses a PT tapered port thread and a robust 32 mm carbon steel rod to manage high side loads. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-20S |
|---|---|
| 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 SAIJ125X185-20S
| 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 SAIJ125X185-20S Is Used
Machine Setup Changeover
Fine-tune the 165-185 mm travel window during product size changeovers to set precise retract positions without disassembling the line.
Variable End-Stop Positioning
Dial in the exact end-of-stroke location for multi-format packaging equipment, relying on the rear screw to trim the 185 mm stroke by up to 20 mm.
Heavy-Duty Assembly Press
Leverage the 6136 N push force at 0.5 MPa to seat large components, using the adjustable stop to compensate for material thickness variations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-20S the Right Cylinder?
Select this 125 mm bore when an 80 mm bore falls short—the 80 mm generates 2513 N of push force at 0.5 MPa, whereas this 125 mm provides 6136 N. Choose the SAIJ adjustable-stroke design over a fixed SAI cylinder when you need variable end-stops for product changeovers without swapping the physical cylinder or adding external stops. To match this ISO 15552 replacement, specify the 125 mm bore, 185 mm stroke, 20 mm adjustment, PT G1/2 port, and the -S magnet.
The rear adjuster screw acts purely as a travel stop and works alongside the variable air cushions to decelerate the load. It is not a locking device. A plain SAIJ cylinder will not hold its load without live air pressure; for fail-safe load holding, consider the SAIL or BSAI series, or use an external pilot-operated check valve.
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 SAIJ125X185-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
The rear adjuster screw lets you shorten the 185 mm nominal stroke by up to 20 mm, creating a 165 to 185 mm usable travel window. The adjuster acts as a mechanical stop to fine-tune the end position at commissioning without needing external stops.
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