Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-40S 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 SAIJ125AX175-40S
The AirTAC SAIJ125X175-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 135 to 175 mm, letting you dial back the nominal stroke by up to 40 mm during commissioning. It delivers 6136 N of push force at 0.5 MPa and reaches 11045 N at 0.9 MPa, making it a robust choice for heavy handling.
This SKU is configured with a SUS420J2 stainless steel rod (code A) for corrosion resistance and includes a piston magnet (-S) for electronic DMSE or reed CMSE position sensing. The rear adjuster acts purely as a mechanical stop to set the retraction end position. It does not hold the load without live air pressure; for true drop protection, consider an external rod lock or the AirTAC SAIL series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-40S |
|---|---|
| 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 SAIJ125AX175-40S
| 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 SAIJ125AX175-40S Is Used
Variable Product Changeover
Dial in the 135 to 175 mm stroke window on the fly to accommodate different package sizes on a packaging line without changing out the cylinder.
Machine Setup Fine-Tuning
Use the 40 mm rear adjustment screw to precisely set the retract end position during commissioning, avoiding mechanical hard stops.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or metal blanks through automated machining cells.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-40S the Right Cylinder?
Select this 125 mm bore when 80 mm is insufficient (the 80 mm bore yields 2513 N at 0.5 MPa) and you need variable end stops for product changeovers. The integrated 40 mm adjuster removes the need to swap cylinders or bolt on external stopper blocks when tuning the 135-175 mm travel. As an ISO 15552 profile cylinder, it matches standard mounting dimensions and uses a PT G1/2 tapered port.
When specifying a replacement, verify the bore, stroke, 40 mm adjustment, PT G1/2 port, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles found on some fixed-stroke lines. For any stroke of 300 mm or more, an external guide is recommended to manage side loads, though this 175 mm unit handles standard loads well.
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 SAIJ125AX175-40S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke by up to 40 mm, creating a 135 to 175 mm travel window. It sets the end position but does not lock the load without live air.
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