Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 35mm 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
- Stroke35 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20S
The AirTAC SAIJ40X35-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the retract end position during commissioning. It provides a usable travel window of 15-35 mm from its 35 mm nominal stroke. Delivering 628 N of push force at 0.5 MPa, it fits medium-duty tasks. The external stopper sets the travel end without needing external stops.
This variant features a SUS304 stainless steel rod for corrosion resistance and includes a magnet for position sensing. It works with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel carries sensor grooves on both sides. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 35 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 SAIJ40BX35-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×35 | 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 SAIJ40BX35-20S Is Used
Machine Changeover
Dial in the exact retract position within the 15-35 mm window when switching product sizes on a packaging line.
End-Position Tuning
Fine-tune the stroke during commissioning without adding external stops or changing the cylinder.
Corrosive Environments
The SUS304 stainless steel rod provides reliable actuation in washdown or mildly corrosive settings.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20S the Right Cylinder?
Choose this 40 mm bore when 32 mm (402 N push at 0.5 MPa) is too weak, but 50 mm (982 N) is oversized. The 20 mm adjustment range is ideal for setups needing variable end stops or product changeovers. Unlike a fixed SAI cylinder, this model allows precise end-position tuning without swapping parts.
The rear adjuster acts as a travel stop, not a lock, so it will not hold the load without live air. For fail-safe load holding, consider the SAIL or BSAI series. This configuration includes a -S magnet, PT tapered ports, and a SUS304 rod.
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 SAIJ40BX35-20S FAQ
It delivers 628 N of push force and 528 N of pull force at 0.5 MPa. The 35 mm nominal stroke can be adjusted back by up to 20 mm, providing a usable travel window of 15 to 35 mm.
The external screw at the rear acts as a mechanical stop to shorten the effective stroke. It is not a locking device, so the cylinder requires live air to maintain its position under load.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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