Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20S
The AirTAC SAIJ40X80-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 80 mm stroke that can be fine-tuned down by up to 20 mm, giving you a precise 60-80 mm usable travel window during machine commissioning. Delivering 628 N of push force at 0.5 MPa, it handles moderate actuation tasks with ease.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and carries an integrated magnet for position sensing. You can mount AirTAC CMSE reed or DMSE electronic solid-state switches directly into the sensor grooves on both sides of the extruded aluminum barrel. It uses a PT tapered port and offers variable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX80-20S Is Used
Product Changeover
Dial in the 60-80 mm travel window quickly on packaging lines when switching between different container sizes without changing hardware.
Machine Setup
Fine-tune the exact end-of-stroke position during commissioning using the rear stopper to perfect alignment before locking down the tooling.
Variable End Stops
Achieve precise lower-end positioning on light assembly presses where a fixed 80 mm stroke would bottom out the tooling too hard.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20S the Right Cylinder?
Choose this 40 mm bore when you need more power than the 32 mm version (which offers 402 N push at 0.5 MPa) but want a more compact footprint than the 50 mm option (982 N). The adjustable stroke is ideal for applications requiring variable end stops or product-size changeovers, preventing the need to swap out a fixed-stroke SAI cylinder. The rear adjuster acts strictly as a travel stop and does not hold the load without live air; for true pneumatic locking, consider the SAIL or BSAI series.
To match this ISO 15552 interchangeable cylinder exactly, specify a 40 mm bore, 80 mm nominal stroke, 20 mm adjustment range, PT port thread, and the -S magnet option. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. The M12x1.25 rod thread provides a robust connection for your tooling, though external guides should still be used to manage side loads.
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 SAIJ40 Adjustable Cylinder SAIJ40BX80-20S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the nominal 80 mm down to a minimum of 60 mm. This allows you to set the exact end position during setup without adding external stops.
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