Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20 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 SAIJ40BX80-20
The AirTAC SAIJ40X80-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 60 to 80 mm without adding external stops. Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
This model uses a PT G1/4 port and M12x1.25 rod thread, providing a robust interface that handles moderate side loads well. The rear adjuster acts purely as a mechanical stop to set the exact end position during commissioning or product changeovers, functioning alongside the standard air cushions at both ends to decelerate the piston smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20 |
|---|---|
| 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 SAIJ40BX80-20
| 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 SAIJ40BX80-20 Is Used
Product Changeover
Dial in the 60-80 mm travel window during line changeovers to accommodate different package lengths without physically swapping the actuator.
End-Position Tuning
Fine-tune the exact retract stop during machine commissioning to compensate for mechanical tolerance stack-up in the assembly fixture.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod for reliable actuation in food processing or packaging environments where moisture is present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX80-20 the Right Cylinder?
Select this 40 mm bore when an application requires more force than the 32 mm version (402 N push at 0.5 MPa) but lacks the physical space or need for a 50 mm cylinder (982 N push). The adjustable 60-80 mm travel window is ideal for machines that process multiple product sizes, allowing operators to dial in the exact end-stop on the fly rather than swapping out a fixed-stroke SAI cylinder. Remember that the rear adjuster is a travel stop, not a locking device; this double-acting cylinder cannot hold a load without live air pressure, so a SAIL or BSAI model is required for true fail-safe load holding.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 80 mm nominal stroke, 20 mm adjustment range, PT G1/4 port, and Basic/LB/TC mounting footprint. Because the stroke is under 300 mm, the 16 mm rod handles the internal guiding adequately without requiring an external guide rail, provided side loads are kept within standard limits.
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 SAIJ40BX80-20 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. If you need higher force, stepping up to the 50 mm bore yields 982 N of push force at the same pressure.
The rear adjuster screw allows you to shorten the 80 mm nominal stroke by up to 20 mm, creating a usable travel window of 60 to 80 mm. The adjuster acts as a mechanical stop to set the end position and does not function as a lock, meaning the cylinder still requires live air pressure to hold its load.
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