Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 170mm 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
- Stroke170 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20
The AirTAC SAIJ125X170-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 150-170mm usable travel window. Built with a SUS420J2 stainless steel rod and PT tapered port threads, it delivers 8590N of push force at 0.7MPa. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
The 20mm adjustment range allows you to fine-tune the retract end position at commissioning without swapping the cylinder or adding external stops. The rear adjuster acts as a travel stop, not a lock, so it cannot hold the load without live air. For position holding without pneumatic pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 170 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 SAIJ125AX170-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×170 | 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 SAIJ125AX170-20 Is Used
Machine Changeover
Dial in the 150-170mm travel window during product size changes to set exact retract positions without mechanical modifications.
End-Stop Tuning
Fine-tune the final end position at commissioning using the rear adjuster, avoiding the need to swap out the entire cylinder.
Heavy Assembly Press
Leverage the 8590N push force at 0.7MPa for heavy pressing tasks while trimming the stroke to protect tooling from overtravel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX170-20 the Right Cylinder?
Choose this 125mm bore when you need heavy thrust beyond the 80mm bore class, which provides 3518N push at 0.7MPa. The SAIJ125X170-20 is ideal for applications requiring precise variable end-stops during machine setup or product changeover. It uses a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
Since the 170mm stroke is below the 300mm side-load threshold, the robust 32mm rod handles standard loads well, though unsupported heavy traversing still requires an external guide. This cylinder is dimensionally interchangeable with ISO 15552 cylinders. Configuration details: PT port, no magnet, and SUS420J2 stainless steel rod.
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 SAIJ125AX170-20 FAQ
The SAIJ125X170-20 has a rear adjuster screw that lets you shorten the 170mm nominal stroke by up to 20mm, providing a usable travel window of 150-170mm. The adjuster acts as a mechanical stop to set the end position and is not a lock, meaning it will not hold the load without live air pressure.
At an operating pressure of 0.7MPa, this 125mm bore cylinder generates 8590N of push force and 5734N of pull force. It operates at speeds between 30 and 500mm/s.
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