Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 175mm 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
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50S
The AirTAC SAIJ125X175-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This creates a usable stroke window of 125 to 175 mm, letting you dial in the exact end position during commissioning without swapping out the physical cylinder. It delivers robust thrust, pushing 6136 N and pulling 5734 N at 0.5 MPa, making it ideal for heavy-duty actuation.
Equipped with a carbon steel rod and PT tapered ports, this unit includes a magnet for position sensing. The extruded aluminum barrel provides sensor grooves on both sides, accepting AirTAC CMSE reed and DMSE electronic switches. The rear adjuster acts purely as a mechanical stop to set the retract position; it does not lock or hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAIJ125X175-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SAIJ125X175-50S Is Used
Variable End-Stop Setup
Dial in the retract distance within the 125-175 mm window during machine commissioning to perfect positioning without remounting hardware.
Heavy Product Changeover
Leverage the 6136 N push force to move heavy pallets, using the 50 mm adjustment to adapt the stroke depth for different product sizes on the line.
Sensor-Driven Testing
Utilize the integrated magnet with DMSE electronic sensors to confirm exact positions while testing varying stroke lengths for quality assurance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-50S the Right Cylinder?
Select this 125 mm bore when your application requires high force—such as the 6136 N push thrust at 0.5 MPa—and a variable end-stop for product changeovers. If you need less force, stepping down to an 80 mm bore yields 2513 N push thrust. Choose this adjustable-stroke SAIJ over a fixed-stroke SAI when you need to fine-tune the retract distance on the fly rather than machining external stops. For applications requiring the load to be held without continuous air pressure, note that this cylinder's adjuster is only a travel stop; you would need an SAIL air-released lock or a BSAI clamp-lock cylinder instead.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 175 mm nominal stroke, 50 mm adjustment range, PT port thread, and the -S magnet option. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Although the 175 mm stroke is under the 300 mm side-load threshold, the 32 mm rod and M27x2 thread handle substantial loads, but always guide long unsupported rods externally.
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 SAIJ125X175-50S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push thrust and 5734 N of pull thrust. It can reach a maximum push force of 1251 kgf at 1.0 MPa.
The rear mechanical stopper allows you to shorten the nominal 175 mm stroke by up to 50 mm, creating a usable travel window of 125 to 175 mm. This adjuster sets the end position but does not lock the load without live air pressure.
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