Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20
The AirTAC SAIJ125X75-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its 75mm nominal stroke can be dialed back by up to 20mm, creating a precise 55-75mm usable travel window for exact end-position tuning during commissioning. This eliminates the need to swap out the entire cylinder or bolt on external stoppers when adapting to product changeovers.
Built with a robust 32mm carbon steel rod and M27x2 rod thread, this unit handles substantial side loads, while the integrated PT tapered port ensures a secure pneumatic connection. The extruded aluminum barrel features sensor grooves on both sides, allowing you to add CMSE reed or DMSE electronic sensors for position feedback. It utilizes a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125X75-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SAIJ125X75-20 Is Used
Product Changeover
Dial in the 55-75mm stroke window on the fly to accommodate different package sizes on a packaging line without changing cylinder hardware.
End-Stop Calibration
Fine-tune the retraction end position during machine commissioning to prevent mechanical crashes and achieve precise pressing depths.
Variable Forming Stops
Set exact material forming limits on heavy-duty equipment by adjusting the rear stopper rather than relying on fixed stroke lengths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X75-20 the Right Cylinder?
Select this 125mm bore cylinder when an 80mm bore falls short on power, as stepping down to an 80mm unit reduces your 0.5 MPa push force from 6136N to 2513N. The adjustable 55-75mm travel window is ideal for applications requiring variable end-stops or frequent machine setup tweaks without replacing hardware. For load-holding without live air pressure, note that this cylinder's rear adjuster acts only as a travel stop, not a lock; you should explore an AirTAC SAIL or BSAI model for secure clamping.
When matching your ISO 15552 replacement, verify the 125mm bore, 75mm stroke, 20mm adjustment range, PT port thread, and the required mounting style. Since this configuration uses a standard carbon steel rod and lacks the -S magnet suffix, it is optimized for mechanical stop adjustments without electronic position sensing.
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 SAIJ125X75-20 FAQ
At a 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590N.
The rear adjusting screw acts as a mechanical stopper that shortens the 75mm nominal stroke by up to 20mm, giving you a usable travel window of 55-75mm. It only sets the travel end and does not lock the load without live air pressure.
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